DESC:FIELD OF THE INVENTION
[0001] The present disclosure generally relates to the field of construction materials. Specifically, it relates to a Cementitious Crystalline Durability Enhancing Admixture (CDEA) additive to be used in concrete constructions.

BACKGROUND OF THE INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Modern concrete infrastructures have a useful life of only around 100 years and are vulnerable to wear induced by mechanical, seismic, environmental and/or other stresses. Measures such as reparation, waterproofing, and water-blocking inevitably increase cost and also prolong the construction period for structure building, and are therefore preferably avoided when possible.
[0004] In the emerging technology of construction, existing additives are restricted to core filling and water filling actions. But new materials are coming with innovations and applications to make more and more modern building, materials and wide applications.
[0005] The above limitations led to the development of “self-healing concrete” that can automatically repair even when cracking has been formed. They have the property of self-repairing their own cracking, and can preserve the water-blocking performance and durability even without the reparations or waterproofing and water-blocking treatment.
[0006] Most of the durability Coatings work by filling the surface capillaries of concrete forms insoluble crystals after surface penetration. As they are not fully effective to give durability to the concrete.
[0007] Some crystalline durability admixtures work by repelling water penetration in to the concrete by using the ingredient which work on the principle of water hydrophobicity they do not closed voids physically.
[0008] Most of the crystalline durability additives working on the said principles that give adverse effect because of direct reactivity of active ingredient with concrete. Whereas, some hydrophobic water repellent ingredients can gives negative impact on concrete.
[0009] The present invention satisfies the existing needs, as well as others, and generally overcomes the deficiencies found in the prior art.

OBJECTIVE OF THE INVENTION
[0010] An object of the present invention is to provide a Crystalline Durability Enhancing Admixture (CDEA) additive composition to be used in concrete construction.
[0011] An object of the present invention is to provide a CDEA additive composition to be used in concrete construction.
[0012] An object of the present invention is to provide a CDEA additive composition to be used in concrete construction, wherein the CDEA enhances the durability of concrete construction.
[0013] An object of the present invention is to provide a self-healing CDEA additive composition to be used in concrete construction.
[0014] An object of the present invention is to provide a self-healing CDEA additive composition to be used in concrete construction, wherein the CDEA additive composition reacts in the concrete to form non-soluble crystalline hydration products in the capillary pores of the concrete.
[0015] An object of the present invention is to provide a self-healing CDEA additive composition to be used in concrete construction, which reduces capillary absorption, the penetration of water and chemical corrosion.
[0016] Another object of the present invention is to provide a self-healing CDEA additive composition comprising a cementitious material or pozzolan or pozzolans, an extender and an active crystalline penetrating agent.
[0017] Another object of the present invention is to provide a self-healing CDEA additive composition comprising,
a. a cementitious material or a pozzolan or a filler comprising SiO2;
b. one or more water-soluble sodium salts of inorganic compound;
c. one or more carboxylate salts of calcium;
d. optionally, at least one micro filler;
e. optionally, at least one amine; and
f. optionally a hygroscopic mineral.
[0018] Another object of the present invention is to provide a self-healing CDEA additive composition comprising,
a. a cementitious material or a pozzolan or a filler comprising SiO2 ranging from about 40% w/w to about 90% w/w of the composition;
b. one or more water-soluble sodium salts of inorganic compound ranging from about 5% w/w to about 15% w/w of the composition;
c. one or more carboxylate salts of calcium ranging from about 1% w/w to about 15% w/w of the composition;
d. optionally, at least one micro filler ranging from about 1% w/w to about 15% w/w of the composition;
e. optionally, at least one amine ranging from about 0.1% w/w to about 20% w/w of the composition; and
f. optionally, a hygroscopic mineral ranging from about 5% w/w to about 15% w/w of the composition.
[0019] Yet another object of the present invention is to provide an eco-friendly and sustainable method for preparing a self-healing CDEA additive composition.
[0020] Yet another object of the present invention is to provide an eco-friendly and sustainable method for preparing a self-healing CDEA additive composition comprising the steps of:
a. mixing a sodium salt of inorganic compound, a carboxylate salt of calcium, and optional ingredients, a micro-filler, an amine and a hygroscopic agent in a twin-shaft mixer till a homogenous mixture is obtained; and
b. adding a cementitious material or a pozzolan or a filler comprising SiO2 to the homogenous mixture from step a) and mixing in a twin-shaft mixer till a homogenous mixture is obtained.

SUMMARY OF THE INVENTION
[0021] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in Detailed Description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
[0022] In an aspect, the present disclosure relates to a Crystalline Durability Enhancing Admixture (CDEA) additive to be used in concrete construction.
[0023] In an aspect, the present disclosure relates to a CDEA additive composition to be used in concrete construction.
[0024] In an aspect, the present disclosure relates to a CDEA additive composition to be used in concrete construction, wherein the CDEA enhances the durability of concrete construction.
[0025] In an aspect, the present disclosure relates to a self-healing cementitious CDEA additive composition to be used in concrete construction.
[0026] In an aspect, the present disclosure relates to a self-healing CDEA additive composition to be used in concrete construction, wherein the CDEA reacts in the concrete to form non-soluble crystalline hydration products in the capillary pores of the concrete.
[0027] In an aspect, the present disclosure relates to a self-healing CDEA additive composition to be used in concrete construction, which reduces capillary absorption, the penetration of water and chemical corrosion.
[0028] In an aspect, the present disclosure relates to a self-healing CDEA additive composition comprising a cementitious material or pozzolan or pozzolans, an extender and an active crystalline penetrating agent.
[0029] In another aspect, the present disclosure relates to a self-healing CDEA additive composition comprising,
a. a cementitious material or a pozzolan or a filler comprising SiO2;
b. one or more water-soluble sodium salts of inorganic compound;
c. one or more carboxylate salts of calcium;
d. optionally, at least one micro filler;
e. optionally, at least one amine; and
f. optionally a hygroscopic mineral.
[0030] In another aspect, the present disclosure relates to a self-healing CDEA additive composition comprising,
a. a cementitious material or a pozzolan or a filler comprising SiO2 ranging from about 40% w/w to about 90% w/w of the composition;
b. one or more water-soluble sodium salts of inorganic compound ranging from about 5% w/w to about 15% w/w of the composition;
c. one or more carboxylate salts of calcium ranging from about 1% w/w to about 15% w/w of the composition;
d. optionally, at least one micro filler ranging from about 1% w/w to about 15% w/w of the composition;
e. optionally, at least one amine ranging from about 0.1% w/w to about 20% w/w of the composition; and
f. optionally, a hygroscopic mineral ranging from about 5% w/w to about 15% w/w of the composition.
[0031] In yet another aspect, the present disclosure relates to an eco-friendly and sustainable method for preparing a self-healing CDEA additive composition.
[0032] In yet another aspect, the present disclosure relates to an eco-friendly and sustainable method for preparing a self-healing CDEA additive composition comprising the steps of:
a. mixing a sodium salt of inorganic compound, a carboxylate salt of calcium, and optional ingredients, a micro-filler, an amine and a hygroscopic agent in a twin-shaft mixer till a homogenous mixture is obtained; and
b. adding a cementitious material or a pozzolan or a filler comprising SiO2 to the homogenous mixture from step a) and mixing in a twin-shaft mixer till a homogenous mixture is obtained.
[0033] Other aspects of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learnt by the practice of the invention.

DETAILED DESCRIPTION
[0034] The following is a detailed description of embodiments of the disclosure. The embodiments are in such detail as to clearly 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 as defined by the appended claims.
[0035] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[0036] Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
[0037] In some embodiments, numbers have been used for quantifying weight percentages, angles, and so forth, to describe and claim certain embodiments of the invention and are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[0038] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, 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.
[0039] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0040] Unless the context requires otherwise, throughout the specification which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open, inclusive sense that is as “including, but not limited to.”
[0041] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein.
[0042] All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0043] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified.
[0044] The description that follows, and the embodiments described therein, is provided by way of illustration of an example, or examples, of particular embodiments of the principles and aspects of the present disclosure. These examples are provided for the purposes of explanation, and not of limitation, of those principles and of the disclosure.
[0045] The headings and abstract of the invention provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.
[0046] The following discussion provides many example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.
[0047] While a particular form of the invention has been illustrated and described, it will be apparent that various modifications can be made without departing from the spirit and scope of the invention.
[0048] The present disclosure generally relates to a self-healing Crystalline Durability Enhancing Admixture (CDEA) additive composition to be used in concrete construction, wherein the CDEA additive composition enhances the durability of concrete construction by reacting in the concrete to form non-soluble crystalline hydration products in the capillary pores of the concrete thereby reducing capillary absorption, the penetration of water and chemical corrosion.
[0049] In an embodiment of the present invention, the CDEA additive composition fills the capillaries of concrete by creating needle-like crystals when comes in contact with water.
[0050] In an embodiment of the present invention, the concrete comprises Portland cement including but not limited to low-heat Portland cement, normal Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, moderate heat Portland cement, sulfate-resisting Portland cement and the like; mixed cements including but not limited to blast furnace cement, silica cement and fly ash cement.
[0051] In an embodiment of the present invention, the concrete can be used in construction and infrastructure industry such as roads, bridges, flyover, marine structures, docks, irrigation structures, underground structures, tunnels and residential and commercial buildings.
[0052] In an embodiment of the present invention, the concrete comprises 80-95 wt % of cement in combination with the CDEA or filler comprising SiO2 as the additional component.
[0053] In an embodiment of the present invention, the CDEA additive composition comprises a cementitious material or a pozzolan or a filler comprising SiO2, an extender and an active crystalline penetrating agent.
[0054] In an embodiment of the present invention, the pozzolan is a siliceous or aluminosiliceous material that possesses little or no cementitious value but will, in the presence of water and in finely divided form, chemically react with the cementitious material during hydration to form materials with cementitious properties.
[0055] In an embodiment of the present invention, the pozzolan is selected from but not limited to silicate salts of metals, diatomaceous earth, opaline cherts, clays, shales, fly ash, slag, silica fume, volcanic tuffs, pumices, trasses, and the like.
[0056] In an embodiment of the present invention, the CDEA additive composition additionally comprises at least one micro filler, at least one amine, and at least one hygroscopic mineral.
[0057] In an embodiment, the present invention relates to a self-healing cementitious Crystalline Durability Enhancing Admixture (CDEA) additive comprising,
a. a cementitious material or a pozzolan or a filler comprising SiO2;
b. one or more water-soluble sodium salts of inorganic compound;
c. one or more carboxylate salts of calcium;
d. optionally, at least one micro filler;
e. optionally, at least one amine; and
f. optionally a hygroscopic mineral.
[0058] In an embodiment of the present invention, the cementitious material or pozzolan is selected from but not limited to Portland cement including but not limited to low-heat Portland cement, normal Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, moderate heat Portland cement, sulfate-resisting Portland cement and the like; mixed cements including but not limited to blast furnace cement, silica cement and fly ash cement.
[0059] In an embodiment of the present invention, the filler comprising SiO2 is selected from but not limited to colloidal silica, silicate salts of metals, diatomaceous earth, opaline cherts, clays, shales, fly ash, slag, silica fume, volcanic tuffs, pumices, trasses, and the like.
[0060] In an embodiment of the present invention, the sodium salts of inorganic compound is selected from but not limited to sodium chloride, sodium bromide, sodium carbonate, sodium bicarbonate, and the like.
[0061] In an embodiment of the present invention, the amine is selected from the group consisting of but not limited to organic amines, viz., alkylamines, alkanolamines selected from the group consisting of monoethanolamine, diethanolamine, isopropanolamine, ethylenediamine, isopropylamine, diisopropylamine, morphorine, triethanolamine, diaminopropane, aminoethyl ethanolamine, stearylamine, and the like. Most preferably diethanolamine, triethanolamine, or stearyl amine.
[0062] In an embodiment of the present invention, the carboxylate salts of calcium is selected from calcium salts of butyl, oleic, caprylic, and stearic acids including but not limited to calcium behenate, calcium laurate, calcium stearate, calcium undecylenate, calcium oleate, calcium caprylate, and the like.
[0063] In an embodiment of the present invention, the CDEA additive composition may comprise ammonium salts carboxylic acid instead of carboxylate salts of calcium. Ammonium salts carboxylic acid is selected from but not limited to ammonium isostearate, ammonium oleate, ammonium stearate, ammonium laurate, ammonium caprylate, and the like.
[0064] In an embodiment of the present invention, the micro filler is selected from nanosilica, ultrafine GGBS, nano-metakaolin, or any other calcium carbonate based filler including mineral calcite, aragonite or nano-CaCO3. Most preferably mineral calcite.
[0065] In an embodiment of the present invention, the hygroscopic mineral is selected from sodium hydroxide, potassium hydroxide, oxides of magnesia, magnesium hydroxide, and the like.
[0066] In an embodiment of the present invention, the cementitious material or pozzolan is present in at least 5% w/w, at least 10% w/w, least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 35% w/w, at least 40% w/w, at least 50% w/w, at least 55% w/w, at least 60% w/w, at least 65% w/w, at least 70% w/w, at least 75% w/w, at least 80% w/w, at least 85% w/w, or at least 90% w/w of the total composition. Most preferably 40 to 50% w/w of the total composition.
[0067] In an embodiment of the present invention, the fillers comprising SiO2 is present at least 5% w/w, at least 10% w/w, least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 35% w/w, at least 40% w/w, at least 50% w/w, at least 55% w/w, at least 60% w/w, at least 65% w/w, at least 70% w/w, at least 75% w/w, at least 80% w/w, at least 85% w/w, or at least 90% w/w of the total composition. Most preferably 15 to 50% w/w of the total composition.
[0068] In an embodiment of the present invention, the water-soluble sodium salts of inorganic compound is present at least 5% w/w, at least 10% w/w, least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 35% w/w, at least 40% w/w, at least 50% w/w, at least 55% w/w, at least 60% w/w, at least 65% w/w, at least 70% w/w, at least 75% w/w, at least 80% w/w, at least 85% w/w, or at least 90% w/w of the total composition. Most preferably 15 to 50% w/w of the total composition.
[0069] In an embodiment of the present invention, the carboxylate salts of calcium is present at least 1% w/w, at least 2% w/w, least 5% w/w, at least 10% w/w, at least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 40% w/w of the total composition. Most preferably 1 to 15% w/w of the total composition.
[0070] In an embodiment of the present invention, the micro filler is present at least 1% w/w, at least 2% w/w, least 5% w/w, at least 10% w/w, at least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 40% w/w of the total composition. Most preferably 1 to 15% w/w of the total composition.
[0071] In an embodiment of the present invention, the amine is present in at least 0.1% w/w, at least 0.2% w/w, least 0.3% w/w, at least 0.5% w/w, at least 0.6% w/w, at least 0.7% w/w, at least 0.8% w/w, at least 0.9% w/w, at least 1% w/w, at least 1.1% w/w, at least 1.2% w/w, at least 1.3% w/w, at least 1.4% w/w, at least 1.5% w/w, at least 1.6% w/w, at least 1.7% w/w, at least 1.8% w/w, or at least 2% w/w, at least 1% w/w, at least 2% w/w, least 5% w/w, at least 10% w/w, at least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 40% w/w. Most preferably 0.1 to 20% w/w of the total composition.
[0072] In an embodiment of the present invention, the hygroscopic mineral is present at least 5% w/w, at least 10% w/w, least 15% w/w, at least 20% w/w, at least 25% w/w, at least 30% w/w, at least 35% w/w, at least 40% w/w, at least 50% w/w, at least 55% w/w, at least 60% w/w, at least 65% w/w, at least 70% w/w, at least 75% w/w, at least 80% w/w, at least 85% w/w, or at least 90% w/w of the total composition. Most preferably 5 to 15% w/w of the total composition.
[0073] In an embodiment of the present invention, the CDEA additive composition may further comprise Coloring admixtures comprising of pigments, either organic such as phthalocyanine or inorganic pigments selected from metal oxides including but not limited to iron oxide containing pigments, chromium oxide, aluminum oxide, lead chromate, titanium oxide, zinc white, zinc oxide, zinc sulfide, lead white, iron manganese black, cobalt green, manganese blue, manganese violet, cadmium sulfoselenide, chromium orange, nickel titanium yellow, chromium titanium yellow, cadmium sulfide, zinc yellow, ultramarine blue and cobalt blue.
[0074] In another embodiment of the present invention, the CDEA additive composition may be applied to a hardened concrete-containing structure or surface by spraying, brushing, misting and the like.
[0075] In an embodiment of the present invention, the concrete comprising CDEA additive composition has a reduction in the coefficient of permeability by more than 90% calculated as per Darcy Law and Valenta Equation after 4 cycles over 1 control cycle.
[0076] In an embodiment of the present invention, the concrete comprising CDEA additive composition has a Reduction in shrinkage over control.
[0077] In an embodiment of the present invention, the concrete comprising CDEA additive composition has at least 10% increased compressive strength over control.
[0078] In an embodiment of the present invention, the concrete comprising CDEA additive composition has a Reduction in alkali silica reactivity over control as per ASTM C-1260.
[0079] In an embodiment of the present invention, the concrete comprising CDEA additive composition has more than 45% reduction over control as per ASTM-C-1556.
[0080] In an embodiment of the present invention, the concrete comprising CDEA additive composition has lower expansion over control as per ASTM C-1012.
[0081] In an embodiment of the present invention, the concrete comprising CDEA additive composition does not induce carbonation as per IS-516-Part-2.
[0082] In an embodiment of the present invention, the concrete comprising CDEA additive composition self-heals any crack up to 0.5mm when contacted with water.
[0083] In an embodiment, the present disclosure relates to a self-healing CDEA additive composition comprising,
a. a cementitious material or a pozzolan or a filler comprising SiO2 ranging from about 40% w/w to about 90% w/w of the composition;
b. one or more water-soluble sodium salts of inorganic compound ranging from about 5% w/w to about 15% w/w of the composition;
c. one or more carboxylate salts of calcium ranging from about 1% w/w to about 15% w/w of the composition;
d. optionally, at least one micro filler ranging from about 1% w/w to about 15% w/w of the composition;
e. optionally, at least one amine ranging from about 0.1% w/w to about 20% w/w of the composition; and
f. optionally, a hygroscopic mineral ranging from about 5% w/w to about 15% w/w of the composition.
[0084] In an embodiment, the present disclosure relates to an eco-friendly and sustainable method for preparing a self-healing CDEA additive composition.
[0085] In an embodiment, the present disclosure relates to an eco-friendly and sustainable method for preparing a self-healing CDEA additive composition comprising the steps of:
a. mixing a sodium salt of inorganic compound, a carboxylate salt of calcium, and optional ingredients, a micro-filler, an amine and a hygroscopic agent in a twin-shaft mixer till a homogenous mixture is obtained; and
b. adding a cementitious material or a pozzolan or a filler comprising SiO2 to the homogenous mixture from step a) and mixing in a twin-shaft mixer till a homogenous mixture is obtained.
[0086] While the foregoing describes various embodiments of the disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
[0087] In an embodiment, the eco-friendly water-based aerosol glitter spray paint composition of the present invention maybe used in any manner known to a person skilled in the art.
EXAMPLES
[0088] The present disclosure is further explained in the form of following examples. However, it is to be understood that the foregoing examples are merely illustrative and are not to be taken as limitations upon the scope of the invention. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the scope of the invention.
[0089] Example 1: CDEA Composition 1:
Table 1: CDEA Composition 1:
S. No. CDEA Component Percentage w/w of the composition
1 Fly ash 87.9
2 Micro Filler 0
3 Calcium stearate 10
4 Sodium carbonate 2
5 Mineral Admixture 0
6 Triethanolamine 0.1

The above composition extended the workability of concrete with respect to control mix, provided good density of mix and achieved more strength with respect to control.
[0090] Example 1: CDEA Composition 2:
Table 2: CDEA Composition 2:
S. No. CDEA Component Percentage w/w of the composition
1 Fly ash 70.00
2 Micro Filler 10.00
3 Calcium stearate 0.00
4 Sodium carbonate 10.00
5 Mineral Admixture 10.00
6 Triethanolamine 00

[0091] Example 3: CDEA Composition 3:
Table 3: CDEA Composition 3:
S. No. CDEA Component Percentage w/w of the composition
1 Fly ash 75.00
2 Micro Filler 6.00
3 Calcium stearate 1.00
4 Sodium carbonate 8.00
5 Mineral Admixture 10.00
6 Triethanolamine 0.10

[0092] Example 4: CDEA Composition 4:
Table 4: CDEA Composition 4:
S. No. CDEA Component Percentage w/w of the composition
1 Fly ash 75.00
2 Micro Filler 6.00
3 Calcium stearate 3.00
4 Sodium carbonate 6.00
5 Mineral Admixture 10.00
6 Triethanolamine 0.10

[0093] Example 5: CDEA Composition 5:
Table 5: CDEA Composition 5:
S. No. CDEA Component Percentage w/w of the composition
1 Fly ash 80.00
2 Micro Filler 5.00
3 Calcium stearate 4.00
4 Sodium carbonate 5.00
5 Mineral Admixture 6.00
6 Triethanolamine 0.10

[0094] Example 6: Co-efficient of permeability:
The composition from Example 1 reduced the coefficient of permeability by more than 90% calculated as per Darcy Law and Valenta Equation after 4 cycles over 1 control cycle.
[0095] Example 7: Compatibility:
The composition from Example 1 is compatible with mineral as well as chemical admixture with OPC and PPC Cement.
[0096] Example 8: Chloride Diffusion Coefficient:
The composition from Example 1 exhibited more than 45% reduction over control as per ASTM-C-1556.
[0097] Example 9: Sulfate Resistance:
The composition from Example 1 exhibited lower expansion over control as per ASTM-C-1012.
[0098] Example 10: Carbonation Resistance:
The composition from Example 1 does not induce carbonation as per IS-516-Part-2.
[0099] Example 11: Alkali-Silica reactivity:
The composition from Example 1 reduced alkali silica reactivity over control as per ASTM C-1260.
[00100] Example 12: Self-healing capacity:
The composition from Example 1 was analyzed for self-healing capacity using in-house developed method. The composition from Example 1 exhibited a capacity to heal a crack of up to 0.5mm when contacted with water.
,CLAIMS:1. A cementitious Crystalline Durability Enhancing Admixture (CDEA) additive composition for concrete, wherein the composition comprises,
a. a cementitious material or pozzolan or a filler comprising SiO2;
b. one or more water-soluble sodium salts of inorganic compound;
c. one or more carboxylate salts of calcium;
d. optionally, at least one micro filler;
e. optionally, at least one amine; and
f. optionally a hygroscopic mineral.
characterized in that:
- the composition is mixed with mortar during concrete preparation;
- the composition, when mixed with water forms needle-like non-soluble crystalline hydrates in the capillary pores of the concrete; and
- the composition comprises self-healing, water-proofing, and chemical corrosion resistance properties.
2. The CDEA additive composition as claimed in claim 1, wherein the filler is colloidal silica, silicate salts of metals, cement, diatomaceous earth, opaline cherts, clays, shales, fly ash, slag, silica fume, volcanic tuffs, pumices, trasses.
3. The CDEA additive composition as claimed in claim 1, wherein the micro filler is mineral calcite.
4. The CDEA additive composition as claimed in claim 1, wherein the sodium salt of inorganic compound is sodium chloride, sodium bromide, sodium carbonate, or sodium bicarbonate.
5. The CDEA additive composition as claimed in claim 1, wherein the amine is alkylamine or alkanolamine.
6. The CDEA additive composition as claimed in claim 1, wherein the carboxylate salt of calcium is calcium salts of butyl, oleic, caprylic, and stearic acids.
7. The CDEA additive composition as claimed in claim 1, wherein the hygroscopic mineral is sodium hydroxide, potassium hydroxide, oxides of magnesia, magnesium hydroxide
8. A concrete composition comprising a standard mortar of cement and the CDEA additive composition as claimed in claim 1.
9. The concrete composition as claimed in claim 7, wherein the composition comprises 80-95 wt % of standard mortar of cement and 5-20 wt% of the CDEA additive composition as claimed in claim 1.
10. A self-healing cementitious CDEA additive composition for concrete, wherein the composition comprises,
a. a cementitious material or pozzolan or a filler comprising SiO2 ranging from about 40% w/w to about 90% w/w of the composition;
b. one or more water-soluble sodium salts of inorganic compound ranging from about 5% w/w to about 15% w/w of the composition;
c. one or more carboxylate salts of calcium ranging from about 1% w/w to about 15% w/w of the composition;
d. optionally, at least one micro filler ranging from about 1% w/w to about 15% w/w of the composition;
e. optionally, at least one amine ranging from about 0.1% w/w to about 20% w/w of the composition; and
f. optionally, a hygroscopic mineral ranging from about 5% w/w to about 15% w/w of the composition.
characterized in that:
- the composition is mixed with mortar during concrete preparation;
- the composition, when mixed with water forms needle-like non-soluble crystalline hydrates in the capillary pores of the concrete; and
- the composition comprises self-healing, water-proofing, and chemical corrosion resistance properties.
11. An eco-friendly and sustainable method for preparing a self-healing CDEA additive composition comprising the steps of:
a. mixing a sodium salt of inorganic compound, a carboxylate salt of calcium, and optional ingredients a micro-filler, an amine and a hygroscopic agent in a twin-shaft mixer till a homogenous mixture is obtained; and
b. adding a cementitious material or a pozzolan or a filler comprising SiO2 to the homogenous mixture from step a) and mixing in a twin-shaft mixer till a homogenous mixture is obtained;
wherein, the CDEA additive composition is mixed with standard mortar of cement during concrete preparation;
characterized in that
- the mortar composition comprises 80-95 wt % of standard mortar of cement and 5-20 wt% of CDEA additive composition.