Description:FIELD OF DISCLOSURE
[0001] The present disclosure relates generally relates to the field of construction materials and civil engineering. More specifically, it pertains to a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite.
BACKGROUND OF THE DISCLOSURE
[0002] The construction industry is undergoing a paradigm shift toward sustainability, durability, and performance-driven solutions in materials engineering.
[0003] Among the most promising developments is the advancement of engineered cementitious composites (ECCs), which are a class of high-performance fiber-reinforced cement-based materials designed to exhibit superior ductility, tensile strength, and crack control compared to traditional concrete.
[0004] ECCs, sometimes known as "bendable concrete," have emerged as a response to the brittle nature of conventional concrete, aiming to improve resilience and longevity in structural applications.
[0005] A key factor in the performance of ECCs lies in optimizing the matrix composition, particularly through innovative use of supplementary cementitious materials and nanotechnology-enhanced additives.
[0006] Cementitious composites have long been the backbone of modern infrastructure, but conventional concrete's limitations in tensile capacity and crack control have led to significant durability concerns over time.
[0007] The introduction of fiber reinforcement improved toughness and reduced crack propagation, yet it did not fully resolve issues of brittleness or environmental impact associated with high cement consumption.
[0008] ECCs were conceptualized to bridge this gap, utilizing micromechanical principles to achieve strain-hardening behavior and tight crack width control even under tensile loads.
[0009] While fiber types and dosage play a critical role in ECC performance, the underlying cementitious matrix also significantly influences mechanical properties and durability.
[0010] Therefore, exploring modifications to the cementitious matrix through partial replacement of cement and incorporation of nano-additives has become an important research direction.
[0011] Ground granulated blast-furnace slag (GGBS) is a byproduct of the iron and steel manufacturing process and has been widely recognized as a sustainable supplementary cementitious material (SCM).
[0012] Its inclusion in cementitious systems contributes to reducing the carbon footprint of cement production by offsetting clinker content, while also enhancing certain durability aspects such as sulfate resistance and long-term strength gain.
[0013] The pozzolanic and latent hydraulic properties of GGBS allow it to react with calcium hydroxide generated during cement hydration, forming additional calcium silicate hydrate (C-S-H) gel, which contributes to strength development.
[0014] However, the extent of GGBS's beneficial effects is closely tied to its dosage and interaction with other components in the mix, making it essential to evaluate the optimal GGBS/cement ratio for achieving desired mechanical properties without compromising early-age strength or workability.
[0015] Simultaneously, the advent of nanotechnology has introduced new possibilities for enhancing cementitious composites.
[0016] Nano-silica, an ultrafine form of amorphous silica particles with particle sizes typically ranging from 10 to 100 nanometers, has attracted attention for its ability to act as a nucleation site for C-S-H formation, densify the microstructure, and refine pore size distribution in cement matrices.
[0017] By accelerating cement hydration and filling voids at the nanoscale, nano-silica has been reported to increase early and long-term compressive strength, reduce permeability, and improve durability metrics.
[0018] Nevertheless, its high surface area and agglomeration tendency pose challenges in achieving uniform dispersion within cementitious systems.
[0019] The synergistic or antagonistic interactions between nano-silica and other supplementary materials, such as GGBS, further complicate predicting their combined effects on ECC performance.
[0020] Given the complexity of interactions between GGBS, nano-silica, and the cementitious matrix, developing a systematic and reproducible method to evaluate their combined influence on ECC strength becomes imperative.
[0021] Traditional trial-and-error approaches or isolated parametric studies may not capture the multidimensional effects of varying GGBS/cement ratios and nano-silica dosages.
[0022] Moreover, the interplay between pozzolanic reactions, particle packing density, hydration kinetics, and fiber-matrix bonding necessitates an integrated methodological framework that considers multiple performance metrics, including compressive strength, tensile strength, flexural strength, and crack pattern analysis.
[0023] A methodical approach would enable researchers, engineers, and material developers to derive optimized formulations tailored for specific structural or durability requirements, reducing reliance on resource-intensive experimental iterations.
[0024] Furthermore, the increasing emphasis on sustainable construction practices and carbon emission reduction goals globally underscores the urgency of substituting clinker-based cement with low-carbon alternatives such as GGBS without compromising structural integrity.
[0025] However, concerns persist regarding potential reductions in early-age strength and slower hydration rates associated with high GGBS replacement levels. The incorporation of nano-silica has been proposed as a strategy to mitigate these drawbacks by accelerating hydration and densifying the microstructure.
[0026] Yet, the optimal balance between GGBS content and nano-silica dosage for achieving both sustainability and mechanical performance remains an open research question.
[0027] A standardized evaluation method provides a foundation for addressing this knowledge gap systematically, enabling comparative studies and facilitating knowledge transfer across academic and industrial stakeholders.
[0028] In addition to technical performance considerations, economic and practical aspects must be addressed in evaluating new ECC formulations. The cost of nano-silica remains relatively high compared to conventional SCMs, and its use must demonstrate sufficient value addition to justify its inclusion in large-scale applications.
[0029] Meanwhile, the availability and quality variability of GGBS across regions may influence its reactivity and performance. A robust evaluation method should account for such material variability by including standardized testing procedures, replicability criteria, and statistical analysis frameworks.
[0030] This would empower decision-makers with reliable data to assess the feasibility of adopting modified ECC formulations in diverse project contexts.
[0031] Moreover, the structural applications of ECCs, particularly in seismic-resistant structures, bridge decks, repair overlays, and precast elements, require a comprehensive understanding of material behavior under different loading conditions.
[0032] The mechanical properties influenced by GGBS/cement ratio and nano-silica addition are not limited to strength alone but extend to toughness, energy absorption capacity, and crack control mechanisms.
[0033] Therefore, an effective evaluation method must incorporate multi-axial testing protocols, microstructural characterization techniques (such as scanning electron microscopy, X-ray diffraction, or mercury intrusion porosimetry), and durability performance indicators (including chloride penetration resistance, freeze-thaw resistance, and alkali-silica reactivity mitigation).
[0034] This holistic approach ensures that the developed ECC formulations meet both short-term performance criteria and long-term serviceability requirements under various environmental exposures.
[0035] Variations in experimental procedures, curing conditions, specimen preparation, and testing protocols across studies hinder meaningful cross-comparisons and meta-analyses of published data.
[0036] By articulating a clear, standardized, and validated method, this disclosure seeks to enhance the reliability of research outcomes and support the formulation of evidence-based material design guidelines.
[0037] Such standardization is essential for transitioning laboratory innovations into industry-ready solutions and aligning with performance-based codes and specifications increasingly adopted in construction practices worldwide.
[0038] Additionally, the importance of incorporating sustainability assessment metrics alongside mechanical performance evaluation. As sustainability metrics such as embodied carbon, energy intensity, and lifecycle assessment gain prominence in material selection decisions, integrating these considerations into the evaluation method provides a more holistic framework for guiding material innovation.
[0039] By correlating mechanical strength outcomes with environmental impact metrics under varying GGBS/cement ratios and nano-silica dosages, stakeholders can make informed trade-offs between mechanical performance and sustainability objectives, aligning with green building certifications and sustainable infrastructure goals.
[0040] In the broader context of cementitious material science, the pursuit of nanotechnology-enhanced binders aligns with the ongoing evolution toward multifunctional, adaptive, and intelligent materials.
[0041] The interaction between nanoscale additives and supplementary cementitious materials represents a frontier area of research with potential implications beyond mechanical strength, including self-healing properties, improved thermal insulation, photocatalytic functionalities, and enhanced durability under aggressive environments.
[0042] While focusing primarily on strength evaluation, lays the groundwork for integrating such multifunctional property assessments in future iterations, thereby contributing to the broader vision of smart and sustainable construction materials.
[0043] One primary disadvantage of such a method lies in the complexity of material behavior and interaction that challenges the accuracy of experimental evaluation.
[0044] Engineered cementitious composites are intricate multi-phase systems in which chemical and physical interactions between cement, supplementary cementitious materials like GGBS, nano-silica, and fibers contribute synergistically to mechanical properties.
[0045] When altering the GGBS/cement ratio and introducing nano-silica, it becomes exceedingly difficult to isolate the independent effects of each variable. The interaction effects—such as the influence of nano-silica on GGBS hydration kinetics or on calcium-silicate-hydrate (C-S-H) gel morphology—complicate the attribution of strength improvements or deteriorations to a specific parameter.
[0046] This complexity increases the possibility of confounding variables, making the method vulnerable to interpretation errors unless highly sophisticated analytical techniques, such as thermogravimetric analysis or scanning electron microscopy, are integrated.
[0047] However, the inclusion of such techniques increases costs and technical demands, limiting the method’s accessibility for routine engineering evaluation.
[0048] Another disadvantage arises from variability in raw material properties, which undermines the reproducibility of the method across different laboratories or regions.
[0049] The properties of GGBS, including its fineness, chemical composition, and latent hydraulic reactivity, can vary significantly depending on the source, manufacturing process, and storage conditions.
[0050] Likewise, nano-silica sourced from different manufacturers or synthesis routes can differ in particle size distribution, specific surface area, and purity. These variations impact the hydration reaction, particle packing, and pozzolanic activity, thereby affecting the mechanical properties of ECC even under the same nominal mix design.
[0051] As a result, a method developed and validated under specific material conditions may fail to yield comparable results elsewhere, limiting its generalizability.
[0052] Standardizing raw material properties is difficult in practice, and unless rigorous characterization and quality control measures are implemented, the method may yield inconsistent or misleading conclusions.
[0053] The sensitivity of the method to curing conditions also poses a significant disadvantage. The curing regime—whether moist curing, steam curing, or sealed curing—substantially influences the hydration of cement, GGBS activation, and nano-silica reactivity.
[0054] For example, elevated-temperature curing may accelerate pozzolanic reactions, artificially inflating short-term strength gains that may not persist in standard ambient conditions.
[0055] Conversely, inadequate curing may suppress the latent hydraulic reaction of GGBS, underestimating its contribution to long-term strength development.
[0056] Therefore, any evaluation method that does not comprehensively account for or control curing conditions may yield strength data that do not reflect the true performance potential of the ECC under field conditions.
[0057] This sensitivity reduces the robustness of the method and necessitates meticulous control and reporting of curing parameters, adding complexity to experimental protocols.
[0058] Moreover, the experimental scale and specimen preparation procedures introduce challenges that affect the reliability and scalability of the method. Laboratory-scale mixing of ECC containing nano-silica requires high-energy mixing to prevent agglomeration and ensure uniform dispersion.
[0059] Nano-silica, due to its high surface area and tendency to form clusters, is notoriously difficult to disperse evenly in aqueous environments. Any inadequate dispersion leads to local inconsistencies in mix homogeneity, manifesting as weak zones or stress concentrators in hardened specimens.
[0060] The mixing energy, sequence of ingredient addition, and pre-dispersion methods (such as ultrasonication) become critical variables that are difficult to standardize across different setups.
[0061] While such procedures can be controlled in research laboratories, scaling them to practical construction environments poses serious challenges, raising concerns about the method’s translational potential from laboratory to field.
[0062] A further disadvantage stems from the limited scope of mechanical property evaluation typically emphasized in such methods.
[0063] While compressive strength is often the primary metric assessed, engineered cementitious composites derive their functional superiority from a broader suite of mechanical properties, including tensile strain capacity, crack width control, and ductility.
[0064] A method focusing solely on strength evaluation neglects these critical performance aspects, providing an incomplete characterization of material behavior.
[0065] In reality, enhancing compressive strength through GGBS replacement or nano-silica addition may inadvertently compromise tensile ductility or fracture toughness if not properly balanced.
[0066] Therefore, the method risks promoting strength optimization at the expense of holistic performance, contradicting the very design philosophy of ECC materials aimed at strain-hardening and crack control.
[0067] Expanding the evaluation scope to include tensile, flexural, and fracture parameters would address this limitation but at the cost of greater experimental complexity and resource demands.
[0068] The instrumentation and testing variability also represent a disadvantage in evaluating strength outcomes. Compressive strength tests are influenced by specimen geometry, loading rate, testing machine calibration, and operator handling.
[0069] Even minor deviations in specimen preparation, such as inadequate compaction or surface irregularities, introduce scatter in strength data. These variabilities may mask subtle effects of GGBS/cement ratio or nano-silica addition, requiring a large number of replicates to achieve statistically significant results.
[0070] This increases testing time, material consumption, and labor requirements, rendering the method less efficient and more resource-intensive. In contexts where testing facilities are limited or expensive, the feasibility of adopting such a method becomes questionable.
[0071] The environmental dimension introduces further disadvantages. Although incorporating GGBS reduces the carbon footprint of cementitious materials by replacing energy- and carbon-intensive Portland cement, the addition of nano-silica complicates the environmental impact assessment.
[0072] Nano-silica production involves energy-intensive processes such as pyrogenic or precipitation routes, and its environmental footprint is not negligible. The life-cycle environmental benefits of using GGBS may be offset if the environmental burden of nano-silica is not accounted for.
[0073] A method focused solely on strength evaluation fails to integrate sustainability metrics, creating a narrow evaluative framework that may inadvertently promote technically stronger but environmentally less sustainable solutions.
[0074] For a material like ECC, positioned at the intersection of high performance and sustainability, this omission represents a strategic disadvantage in holistic material evaluation.
[0075] An additional disadvantage is the high dependency on laboratory infrastructure and technical expertise. The method requires access to specialized equipment for mixing, curing, specimen preparation, and mechanical testing.
[0076] In particular, handling nano-silica powders raises occupational safety concerns due to inhalation risks associated with nanoscale particles.
[0077] Laboratories must implement appropriate health and safety protocols, including fume hoods, personal protective equipment, and particulate filtration systems, to safely conduct experiments.
[0078] These requirements increase operational costs and limit the method’s adoption in regions or institutions lacking advanced facilities.
[0079] For academic settings in developing countries or small enterprises, such infrastructure barriers may render the method impractical or inaccessible.
[0080] Finally, the time-intensive nature of strength evaluation constitutes a disadvantage, especially for long-term strength assessments. While early-age strength gains from nano-silica addition are well-documented, the full-strength development of GGBS-blended systems may extend beyond 28 days due to the slower pozzolanic and latent hydraulic reactions.
[0081] Therefore, a method aiming to capture the true influence of GGBS/cement ratio must incorporate extended curing durations, delaying the availability of performance data.
[0082] In fast-paced construction environments where rapid decision-making is required, such time delays hinder responsiveness and adaptability. Furthermore, long-term storage and monitoring of specimens under controlled conditions add logistical burdens to experimental management.
[0083] Thus, in light of the above-stated discussion, there exists a need for a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite.
SUMMARY OF THE DISCLOSURE
[0084] The following is a summary description of illustrative embodiments of the invention. It is provided as a preface to assist those skilled in the art to more rapidly assimilate the detailed design discussion which ensues and is not intended in any way to limit the scope of the claims which are appended hereto in order to particularly point out the invention.
[0085] According to illustrative embodiments, the present disclosure focuses on a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite which overcomes the above-mentioned disadvantages or provide the users with a useful or commercial choice.
[0086] An objective of the present disclosure is to evaluate the effect of varying GGBS/cement ratios on the compressive strength of engineered cementitious composites (ECCs).
[0087] Another objective of the present disclosure is to assess how different nano-silica dosages influence the tensile strength of ECCs under direct tension.
[0088] Another objective of the present disclosure is to determine the combined impact of GGBS and nano-silica additions on the flexural strength and ductility of ECCs.
[0089] Another objective of the present disclosure is to identify the optimal GGBS/cement ratio and nano-silica dosage that balances mechanical strength, durability, and sustainability in ECCs.
[0090] Another objective of the present disclosure is to investigate the role of nano-silica in refining the microstructure and enhancing fiber-matrix bonding within ECCs.
[0091] Another objective of the present disclosure is to measure the crack resistance and permeability of ECCs incorporating different GGBS/cement ratios and nano-silica additions.
[0092] Another objective of the present disclosure is to evaluate the long-term durability performance of ECCs with partial cement replacement by GGBS in combination with nano-silica.
[0093] Another objective of the present disclosure is to explore the synergy between GGBS and nano-silica in developing a dense, homogeneous matrix that improves strain-hardening behavior.
[0094] Another objective of the present disclosure is to validate the suitability of the optimized ECC composition for critical infrastructure applications requiring high durability and mechanical performance.
[0095] Yet another objective of the present disclosure is to promote sustainable construction practices by reducing cement content while maintaining or enhancing the mechanical properties of ECCs.
[0096] In light of the above, a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite comprises developing an engineered cementitious composite mix by combining a predetermined ratio of ground granulated blast furnace slag (GGBS) to cement. The method also includes preparing concrete specimens including cube specimens for compressive strength testing, cylinder specimens for split tensile strength testing, and dog-bone specimens for direct tensile strength testing. The method also includes curing the specimens for a designated period and performing mechanical tests to determine compressive strength, split tensile strength, and direct tensile strength. The method also includes evaluating the ductility enhancement characteristics of the engineered cementitious composite based on the obtained mechanical test results. The method also includes constructing reinforced concrete beams with an ECC layer and testing under simply supported and two-point load conditions to assess structural performance. The method also includes validating the experimental results through analytical modeling using finite element analysis software. The method also includes the engineered cementitious composite uniquely integrates a hybrid fiber reinforcement system of steel fibers and polyvinyl alcohol fibers in combination with a GGBS/cement ratio and a nano-silica/cement ratio.
[0097] In one embodiment, the mechanical tests include load-displacement monitoring to derive stress-strain curves for evaluating the ductility characteristics of the engineered cementitious composite.
[0098] In one embodiment, the reinforced concrete beams incorporate an ECC layer in the tensile zone of the beam cross-section to enhance crack control under flexural loading.
[0099] In one embodiment, the structural performance evaluation includes measurement of load-carrying capacity, deflection, and crack width at incremental loading stages.
[0100] In one embodiment, the analytical modeling is performed using ANSYS software to simulate stress distribution, crack propagation, and failure mechanisms in the beam specimens.
[0101] In one embodiment, the validation step includes comparing experimental load-deflection curves with simulated load-deflection curves to assess accuracy of the analytical model.
[0102] In one embodiment, the integration of hybrid fiber reinforcement, GGBS/cement ratio, and nano-silica/cement ratio is optimized using a multi-objective evaluation to balance compressive strength, tensile strength, and ductility.
[0103] In one embodiment, the experimental results and analytical model outputs are used to generate a predictive framework for selecting ECC mix designs tailored to specific structural applications.
[0104] In one embodiment, the analytical modeling using finite element analysis software comprises modeling material properties of the engineered cementitious composite as nonlinear material models incorporating strain-hardening and strain-softening behavior to simulate experimental load-deflection curves.
[0105] In one embodiment, a System for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite comprises a material preparation module configured to prepare an ECC mix incorporating a variable GGBS/cement ratio, nano-silica content, and a hybrid fiber composition. The system also includes a mechanical testing module configured to determine the compressive strength, split tensile strength, and direct tensile strength of the prepared ECC mix using standard specimen configurations. The system also includes a structural testing module configured to evaluate the structural performance of reinforced concrete beams incorporating the ECC under simply supported and two-point loading conditions. The system also includes an analytical modeling module configured to validate experimental results using a finite element analysis platform. The system also includes a data analysis unit configured to aggregate, analyze, and compare experimental and analytical results to determine the optimal combination of GGBS/cement ratio, nano-silica content, and hybrid fiber composition for achieving enhanced strength, ductility, and structural performance in ECC.
[0106] These and other advantages will be apparent from the present application of the embodiments described herein.
[0107] The preceding is a simplified summary to provide an understanding of some embodiments of the present invention. This summary is neither an extensive nor exhaustive overview of the present invention and its various embodiments. The summary presents selected concepts of the embodiments of the present invention in a simplified form as an introduction to the more detailed description presented below. As will be appreciated, other embodiments of the present invention are possible utilizing, alone or in combination, one or more of the features set forth above or described in detail below.
[0108] These elements, together with the other aspects of the present disclosure and various features are pointed out with particularity in the claims annexed hereto and form a part of the present disclosure. For a better understanding of the present disclosure, its operating advantages, and the specified object attained by its uses, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated exemplary embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0109] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description merely show some embodiments of the present disclosure, and a person of ordinary skill in the art can derive other implementations from these accompanying drawings without creative efforts. All of the embodiments or the implementations shall fall within the protection scope of the present disclosure.
[0110] The advantages and features of the present disclosure will become better understood with reference to the following detailed description taken in conjunction with the accompanying drawing, in which:
[0111] FIG. 1 illustrates a flowchart outlining sequential step involved in a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite, in accordance with an exemplary embodiment of the present disclosure;
[0112] FIG. 2 illustrates a block diagram showing working of a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite, in accordance with an exemplary embodiment of the present disclosure.
[0113] Like reference, numerals refer to like parts throughout the description of several views of the drawing;
[0114] The method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite, which like reference letters indicate corresponding parts in the various figures. It should be noted that the accompanying figure is intended to present illustrations of exemplary embodiments of the present disclosure. This figure is not intended to limit the scope of the present disclosure. It should also be noted that the accompanying figure is not necessarily drawn to scale.
DETAILED DESCRIPTION OF THE DISCLOSURE
[0115] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.
[0116] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be apparent to one skilled in the art that embodiments of the present disclosure may be practiced without some of these specific details.
[0117] Various terms as used herein are shown below. To the extent a term is used, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0118] The terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items.
[0119] The terms “having”, “comprising”, “including”, and variations thereof signify the presence of a component.
[0120] Referring now to FIG. 1 to describe various exemplary embodiments of the present disclosure. FIG. 1 illustrates a flowchart outlining sequential step involved in a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite, in accordance with an exemplary embodiment of the present disclosure.
[0121] A method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite 100 comprises developing an engineered cementitious composite mix by combining a predetermined ratio of ground granulated blast furnace slag (GGBS) to cement 102.
[0122] The method also includes preparing concrete specimens 104 including cube specimens for compressive strength testing, cylinder specimens for split tensile strength testing, and dog-bone specimens for direct tensile strength testing.
[0123] The method also includes curing the specimens for a designated period and performing mechanical tests 106 to determine compressive strength, split tensile strength, and direct tensile strength.
[0124] The method also includes evaluating the ductility enhancement characteristics of the engineered cementitious composite 108 based on the obtained mechanical test results. The mechanical tests 108 include load-displacement monitoring to derive stress-strain curves for evaluating the ductility characteristics of the engineered cementitious composite.
[0125] The method also includes constructing reinforced concrete beams with an ECC layer and testing under simply supported and two-point load conditions 110 to assess structural performance. The reinforced concrete beams 110 incorporate an ECC layer in the tensile zone of the beam cross-section to enhance crack control under flexural loading. The structural performance evaluation 110 includes measurement of load-carrying capacity, deflection, and crack width at incremental loading stages.
[0126] The method also includes validating the experimental results through analytical modeling 112 using finite element analysis software. The analytical modeling 112 is performed using ANSYS software to simulate stress distribution, crack propagation, and failure mechanisms in the beam specimens. The validation step 112 includes comparing experimental load-deflection curves with simulated load-deflection curves to assess accuracy of the analytical model. The experimental results and analytical model outputs 112 are used to generate a predictive framework for selecting ECC mix designs tailored to specific structural applications. The analytical modeling 112 using finite element analysis software comprises modeling material properties of the engineered cementitious composite as nonlinear material models incorporating strain-hardening and strain-softening behavior to simulate experimental load-deflection curves.
[0127] The method also includes the engineered cementitious composite uniquely integrates a hybrid fiber reinforcement system of steel fibers and polyvinyl alcohol fibers in combination with a GGBS/cement ratio and a nano-silica/cement ratio 114. The integration of hybrid fiber reinforcement, GGBS/cement ratio, and nano-silica/cement ratio 114 is optimized using a multi-objective evaluation to balance compressive strength, tensile strength, and ductility.
[0128] FIG. 1 illustrates a flowchart outlining sequential step involved in a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite.
[0129] At 102, the process begins with the development of the engineered cementitious composite mix by combining a predetermined ratio of GGBS to cement. This stage, involves selecting and proportioning the constituent materials to create a cementitious matrix with enhanced properties. The choice of the GGBS/cement ratio is critical, as GGBS contributes to sustainability and durability by partially replacing Portland cement, reducing the carbon footprint, and improving long-term performance. Additionally, nano-silica is incorporated into the mix to refine the pore structure, enhance the pozzolanic reaction, and improve strength characteristics. The integration of a hybrid fiber system consisting of steel fibers and polyvinyl alcohol (PVA) fibers is also a key innovation at this stage. The steel fibers provide crack-bridging and load-bearing capabilities, while the PVA fibers impart ductility and control microcracking. The synergistic effect of these fibers, combined with the optimized GGBS/cement and nano-silica/cement ratios, forms the basis for a high-performance ECC mix with balanced strength and ductility.
[0130] At 104, following the mix design, the next step involves preparing concrete specimens for mechanical testing. Specimens are cast into specific shapes and sizes to evaluate different mechanical properties. Cube specimens, typically sized 50 x 50 x 50 mm, are prepared for compressive strength testing. These cubes will be subjected to axial compression to determine the maximum load the material can withstand before failure. Cylinder specimens, with dimensions such as 100 mm in diameter and 200 mm in height, are prepared for split tensile strength testing. This test assesses the tensile strength of the material indirectly by applying a diametrical load across the cylinder. Additionally, dog-bone-shaped specimens are cast to facilitate direct tensile strength testing, which measures the material's resistance to direct tension and provides insight into its cracking behavior and tensile load capacity. The meticulous preparation of these specimens ensures that they conform to standardized testing requirements and will yield reliable, reproducible results.
[0131] At 106, once the specimens are prepared, they undergo a curing process for a designated period, typically 28 days, under controlled conditions. This curing process allows the hydration reactions to progress and the material to develop its intended mechanical properties. After curing, mechanical tests are performed to determine the compressive strength, split tensile strength, and direct tensile strength. Compressive strength testing is conducted using a compression testing machine that applies an axial load to the cube specimens until failure occurs, with the maximum load recorded as the compressive strength. Split tensile strength testing is carried out by applying a compressive load along the diameter of the cylinder specimens, causing tensile failure along the vertical plane. Direct tensile strength testing uses the dog-bone specimens clamped in a universal testing machine, with a tensile load applied until rupture. These mechanical tests provide critical data on the material's ability to withstand various loading conditions, offering a comprehensive assessment of its fundamental strength properties.
[0132] At 108, after obtaining the mechanical test results, the next step is to evaluate the ductility enhancement characteristics of the engineered cementitious composite. Ductility is a crucial property for ECC, distinguishing it from conventional concrete by enabling strain-hardening behavior and multiple cracking under tensile stress. The mechanical test data are analyzed to assess parameters such as tensile strain capacity, energy absorption, and post-cracking load-carrying ability. By evaluating the tensile stress-strain curves, the extent of ductility improvement achieved through the integration of hybrid fibers, optimized GGBS/cement ratio, and nano-silica addition is quantified. This evaluation provides insights into the material's deformation behavior under load and its capacity to maintain structural integrity even after initial cracking, a hallmark of engineered cementitious composites.
[0133] At 110, the subsequent stage involves constructing reinforced concrete beams with an ECC layer and testing them under structural loading conditions. In this stage, beams are fabricated with ECC incorporated either throughout the cross-section or as a layer in critical tension zones to leverage its high ductility and crack control properties. The beams are subjected to structural testing under simply supported conditions with two-point loading to simulate bending scenarios commonly encountered in structural applications. Instrumentation such as strain gauges, displacement transducers, and load cells is employed to monitor load-deflection behavior, crack development, and failure modes during the testing. The structural performance is evaluated by analyzing parameters such as load-carrying capacity, deflection at ultimate load, stiffness degradation, and ductility index. This stage provides valuable data on how the engineered cementitious composite influences the structural behavior of reinforced concrete elements, bridging the gap between material-level properties and structural-level performance.
[0134] At 112, the final step in the method is the validation of experimental results through analytical modeling. This validation is performed using finite element analysis software, such as ANSYS, to develop a numerical model that replicates the structural testing conditions and material properties. The analytical model incorporates the experimentally determined mechanical properties of the ECC, including its stress-strain behavior, fracture energy, and tensile strain capacity. Boundary conditions, loading configurations, and geometric details are defined in the model to match the experimental setup. The simulation is run to predict the load-deflection response, crack propagation patterns, and failure mechanisms of the tested beams. The analytical results are then compared with the experimental data to assess the accuracy and reliability of the model. This validation process not only confirms the experimental findings but also enables parametric studies to explore the influence of different mix proportions, fiber contents, and structural configurations on performance outcomes. By integrating experimental and analytical approaches, the method ensures a robust evaluation framework for the engineered cementitious composite.
[0135] At 114, a System for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite comprises a material preparation module configured to prepare an ECC mix incorporating a variable GGBS/cement ratio, nano-silica content, and a hybrid fiber composition. The system also includes a mechanical testing module configured to determine the compressive strength, split tensile strength, and direct tensile strength of the prepared ECC mix using standard specimen configurations. The system also includes a structural testing module configured to evaluate the structural performance of reinforced concrete beams incorporating the ECC under simply supported and two-point loading conditions. The system also includes an analytical modeling module configured to validate experimental results using a finite element analysis platform. The system also includes a data analysis unit configured to aggregate, analyze, and compare experimental and analytical results to determine the optimal combination of GGBS/cement ratio, nano-silica content, and hybrid fiber composition for achieving enhanced strength, ductility, and structural performance in ECC.
[0136] FIG. 2 illustrates a block diagram showing working of a method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite.
[0137] At 202, the process initiates with the identification and specification of input parameters. These parameters include the key variables under investigation, namely the GGBS (Ground Granulated Blast Furnace Slag) to cement ratio and the dosage of nano-silica to be incorporated into the cementitious matrix. Defining these input parameters is essential because they govern the chemical and physical interactions within the engineered cementitious composite. Researchers select a range of GGBS/cement ratios, for example, 0%, 20%, 40%, 60%, and 80%, along with different nano-silica dosages such as 0%, 1%, 2%, and 3% by weight of cement. Each combination represents a unique mix design whose mechanical properties will be evaluated. The selection is guided by prior literature, practical feasibility, and the hypothesis being tested regarding their synergistic or antagonistic effects on mechanical strength.
[0138] At 204, following the establishment of input parameters, the next stage is mix design preparation. In this phase, the proportions of each constituent material are calculated based on the selected input parameters. The mix design aims to maintain workability, durability, and strength while varying the targeted variables. The preparation involves determining the required amounts of cement, GGBS, nano-silica, fine aggregates, superplasticizers, and water. The calculated materials are weighed with precision, ensuring consistency and reproducibility across different batches. This stage bridges theoretical formulations with practical implementation, translating the input parameters into tangible, process-ready formulations that can be mixed and tested.
[0139] At 206, once the mix designs are prepared, the process proceeds to material mixing and sample casting. This phase is crucial because the homogeneity of the mixture greatly influences the performance of the engineered cementitious composite. The dry materials—cement, GGBS, nano-silica, and aggregates—are first blended to achieve uniform dispersion of the fine particles, particularly the nano-silica which tends to agglomerate due to its high surface area. Subsequently, water and chemical admixtures are gradually introduced while the mix is continuously stirred, ensuring a cohesive and workable paste. After achieving the desired consistency, the fresh mix is cast into standardized molds such as cubes, cylinders, or prisms, depending on the mechanical tests planned. Proper compaction techniques, including vibration, are employed to minimize air entrapment and voids within the samples. Each mold is filled in layers, compacted, and surface-finished to prepare it for curing.
[0140] At 208, the next stage is the curing process, a critical determinant of the hydration reaction and the eventual microstructure of the composite. Immediately after casting, the molds are covered with plastic sheets or damp cloth to prevent moisture loss during the initial setting period. After 24 hours, the specimens are demolded and submerged in curing tanks filled with water maintained at a constant temperature, typically 20±2°C, to facilitate continued hydration. The curing durations are set based on the experimental design, often including intervals like 7, 14, and 28 days to evaluate strength development over time. This stage ensures that the chemical reactions between cementitious materials and water proceed uninterrupted, leading to the formation of hydration products such as calcium silicate hydrate (C-S-H) that contribute to strength.
[0141] At 210, upon completion of the curing period, the samples are subjected to mechanical testing to determine their strength characteristics. This stage involves carrying out standardized tests such as compressive strength, flexural strength, and split tensile strength tests, depending on the research objectives. The specimens are carefully removed from the curing tanks, wiped dry, and positioned in testing machines calibrated according to ASTM or IS codes. The loading rates are set as per the standards to ensure uniform stress application until failure. Each reading is recorded meticulously, and multiple samples are tested for each mix design to obtain statistically reliable data. This mechanical testing phase provides the primary quantitative metrics that will be analyzed to assess the influence of varying GGBS/cement ratios and nano-silica addition.
[0142] At 2112, the data collection and analysis stage follow immediately after testing. The strength values obtained from the mechanical tests are compiled systematically, often averaging the results of replicate samples to account for experimental variability. The data is organized in tabular and graphical formats to facilitate interpretation. Statistical tools such as analysis of variance (ANOVA), regression analysis, and correlation analysis are employed to determine the significance of observed differences and trends. The relationships between input parameters and strength outputs are modeled to identify optimal combinations or critical thresholds where performance improves or deteriorates. This analysis stage transforms raw experimental data into actionable insights, supporting evidence-based conclusions.
[0143] At 214, the final stage is the interpretation of results, wherein the data analysis outputs are contextualized within the broader framework of material science and engineering principles. The researcher interprets the findings to explain how changes in GGBS/cement ratio and nano-silica addition influence the hydration kinetics, pore structure, and microstructural development of the engineered cementitious composite. Observations such as increased early strength due to nano-silica’s pozzolanic activity or reduced strength at higher GGBS replacement levels due to dilution effects are critically analyzed. Comparisons are made with previous studies to validate or challenge existing knowledge. The interpretation also explores practical implications, such as the potential of using high GGBS and nano-silica blends to produce sustainable, high-performance cementitious materials. Finally, the limitations of the study and recommendations for future research are discussed, completing the methodological loop.
[0144] While the invention has been described in connection with what is presently considered to be the most practical and various embodiments, it will be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
[0145] A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed in this specification, units and algorithm steps may be implemented by electronic hardware, computer software, or a combination thereof.
[0146] The foregoing descriptions of specific embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present disclosure to the precise forms disclosed, and many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described to best explain the principles of the present disclosure and its practical application, and to thereby enable others skilled in the art to best utilize the present disclosure and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the scope of the present disclosure.
[0147] Disjunctive language such as the phrase “at least one of X, Y, Z,” unless specifically stated otherwise, is otherwise understood with the context as used in general to present that an item, term, etc., may be either X, Y, or Z, or any combination thereof (e.g., X, Y, and/or Z). Thus, such disjunctive language is not generally intended to, and should not, imply that certain embodiments require at least one of X, at least one of Y, or at least one of Z to each be present.
[0148] In a case that no conflict occurs, the embodiments in the present disclosure and the features in the embodiments may be mutually combined. The foregoing descriptions are merely specific implementations of the present disclosure, but are not intended to limit the protection scope of the present disclosure. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present disclosure shall fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
, Claims:I/We Claim:
1. A method for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite (100) comprising:
developing an engineered cementitious composite mix by combining a predetermined ratio of ground granulated blast furnace slag (GGBS) to cement (102);
preparing concrete specimens (104) including cube specimens for compressive strength testing, cylinder specimens for split tensile strength testing, and dog-bone specimens for direct tensile strength testing;
curing the specimens for a designated period and performing mechanical tests (106) to determine compressive strength, split tensile strength, and direct tensile strength;
evaluating the ductility enhancement characteristics of the engineered cementitious composite (108) based on the obtained mechanical test results;
constructing reinforced concrete beams with an ECC layer and testing under simply supported and two-point load conditions (110) to assess structural performance;
validating the experimental results through analytical modeling (112) using finite element analysis software;
the engineered cementitious composite uniquely integrates a hybrid fiber reinforcement system of steel fibers and polyvinyl alcohol fibers in combination with a GGBS/cement ratio and a nano-silica/cement ratio (114).
2. The method (100) as claimed in claim 1, wherein the mechanical tests (108) include load-displacement monitoring to derive stress-strain curves for evaluating the ductility characteristics of the engineered cementitious composite.
3. The method (100) as claimed in claim 1, wherein the reinforced concrete beams (110) incorporate an ECC layer in the tensile zone of the beam cross-section to enhance crack control under flexural loading.
4. The method (100) as claimed in claim 1, wherein the structural performance evaluation (110) includes measurement of load-carrying capacity, deflection, and crack width at incremental loading stages.
5. The method (100) as claimed in claim 1, wherein the analytical modeling (112) is performed using ANSYS software to simulate stress distribution, crack propagation, and failure mechanisms in the beam specimens.
6. The method (100) as claimed in claim 1, wherein the validation step (112) includes comparing experimental load-deflection curves with simulated load-deflection curves to assess accuracy of the analytical model.
7. The method (100) as claimed in claim 1, wherein the integration of hybrid fiber reinforcement, GGBS/cement ratio, and nano-silica/cement ratio (114) is optimized using a multi-objective evaluation to balance compressive strength, tensile strength, and ductility.
8. The method (100) as claimed in claim 1, wherein the experimental results and analytical model outputs (112) are used to generate a predictive framework for selecting ECC mix designs tailored to specific structural applications.
9. The method (100) as claimed in claim 1, wherein the analytical modeling (112) using finite element analysis software comprises modeling material properties of the engineered cementitious composite as nonlinear material models incorporating strain-hardening and strain-softening behavior to simulate experimental load-deflection curves.
10. A system for evaluating the effect of GGBS/cement ratio and nano-silica addition on the strength of engineered cementitious composite comprising
a material preparation module configured to prepare an ECC mix incorporating a variable GGBS/cement ratio, nano-silica content, and a hybrid fiber composition;
a mechanical testing module configured to determine the compressive strength, split tensile strength, and direct tensile strength of the prepared ECC mix using standard specimen configurations;
a structural testing module configured to evaluate the structural performance of reinforced concrete beams incorporating the ECC under simply supported and two-point loading conditions;
an analytical modeling module configured to validate experimental results using a finite element analysis platform;
a data analysis unit configured to aggregate, analyze, and compare experimental and analytical results to determine the optimal combination of GGBS/cement ratio, nano-silica content, and hybrid fiber composition for achieving enhanced strength, ductility, and structural performance in ECC.