Description:FIELD OF THE INVENTION
[0001] The present invention relates to a bituminous rejuvenating agent and a process for recycling bituminous pavement using said rejuvenating agent. Specifically, the present invention relates to a bituminous rejuvenating agent comprising aromatic extract, bitumen, and bonding agent. The bituminous rejuvenating agent is suitable for use in hot in-place and hot in-plant recycling processes.

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] In India, the distressed bituminous pavement is overlaid using virgin bitumen (binder) and virgin aggregate. The overlay makes use of the natural resources and has adverse impact on the ecology. Recycling of bituminous pavement has received a great deal of attention as a practical and economic alternative in the rehabilitation of the deteriorating road system. It is a recognized fact that the bituminous pavement, over a period of time, shows sign of distress due to the age hardening of the binder.
[0004] The concept of recycling lies in restoring the physical and chemical properties of the aged binder to its original and to enhance the mechanical properties and strength of the aged binder. The aged binder is rich in asphaltenes and deficient in resins. The resins consist of naphthene aromics and polar aromatics.
[0005] The bituminous rejuvenating agent is rich in resins and when added to the aged binder makes up the resin content of the aged binder. In this way, the bituminous rejuvenating agent works up the deficiency of the aged binder and makes it as good as virgin new binder.
[0006] The increasing cost of pavement materials, conservation of natural resources, increased transportation of aggregates, economic consequences of energy crisis induced a new spirit among highway fraternity to expedite the recycling process of the distress pavements.
[0007] Bituminous pavement consists of binder (bitumen) and aggregates (stone chips). The ageing process leaves the binder stiffer, less ductile and with lower temperature When bitumen binder is exposed to air and sun's ultraviolet rays, it begins to age and oxidize. The changes that to bitumen binder are primarily due to the chemical composition of the bitumen. Bituminous pavement changes occur in two stages; short term and long term. Short-term ageing is mainly due to volatilization, oxidation and/or absorption of oily components. Long - term ageing happens in the field and is mainly due to changes in composition through reaction between bitumen constituents and atmospheric oxygen. These ageing processes leave binder stiffer, less ductile, and with lower temperature susceptibility than conventional paving grade bitumen. The aging process reduces the ratio of oily maltenes in the binder, leaving a greater ratio of stiffer asphaltenes, which cause the bitumen binder to become less ductile. The deterioration in pavement quality can lead to permanent deformation or rutting, cracking and can lead to inferior skid resistance. The deterioration is evident from a decrease in penetration value, increase in softening point and increase in viscosity.
[0008] Recycling techniques offer a means of recovering desirable pavement properties without replacing the entire pavement with new materials. The technique enable reuse of production waste from bituminous pavement industry. It decreases the demand for natural resources, decreases the production of waste material and reduces costs
[0009] Reclaimed asphalt pavement (known as RAP ) can be recycled "in-place" ( i.e. at road location ) or can be recycled "in-plant" ( i.e. the RAP is removed from the road surface and transported to a bitumen hot mix plant). In a hot in-place recycling process, the existing pavement is reheated, milled and virgin aggregate and a rejuvenating agent are added to the RAP. The process is normally used for resurfacing the top layer of a pavement and can re-use upto 100 % RAP. In a hot in-plant recycling process, the RAP is broken, milled and virgin aggregate, a rejuvenating agent and in some cases, fresh bitumen are added. The in-plant process may be used for the construction of new base layers, but it can be difficult to incorporate high level of RAP into the final product.
[0010] The function of the rejuvenating agent is to modify the properties of the aged binder contained in the RAP so that the recycled bituminous mix has properties resembling those of the original bituminous mix. It may not be possible to restore the bitumen to its former state, but it should be possible to significantly improve those properties that have been subjected to deterioration.
[0011] The commonly used rejuvenating agent is a low viscosity product obtained from crude petroleum distillation. The present inventors have sought to provide a bituminous rejuvenating agent which is rich in polar and naphthene aromatics and has a bonding agent to provide the longer life to the recycled bituminous pavement.
[0012] Therefore there is an unmet need for a new rejuvenating agent and a process for recycling of bituminous pavements.
[0013] The present invention satisfies the existing needs, as well as others, and generally overcomes the deficiencies found in the prior art.

OBJECTS OF THE INVENTION
[0014] An object of the present invention is to provide a bituminous rejuvenating agent.
[0015] An object of the present invention is to provide a method for preparing bituminous rejuvenating agent.
[0016] Another object of the present invention is to provide a process for recycling the bituminous pavement.
[0017] Yet another object of the present invention is to provide a bituminous rejuvenating agent that can be used for a hot in-place recycling process and a hot in-plant recycling process.

SUMMARY OF THE INVENTION
[0018] This summary is provided to introduce a selection of concepts in a simplified form that is further described below in the 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.
[0019] The present invention provides a bituminous rejuvenating agent for bituminous and a method for recycling the bituminous pavement.
[0020] In an aspect, the present invention provides a bituminous rejuvenating agent comprising aromatic extract, bitumen and bonding agent, where the percentages are based upon the total mass of the composition. The bituminous rejuvenating agent has a viscosity of from 50 to 60000 cSt at 60 °C.
[0021] In an aspect, the present invention provides a bituminous rejuvenating agent comprising 5-95% of aromatic extract, 94-4% of bitumen and 0.1-1.0% of bonding agent, wherein the percentages are based upon the total mass of the composition.
[0022] In an aspect, the present invention provides a bituminous rejuvenating agent comprising 65-90% of aromatic extract, and 10-35% of bitumen, wherein the percentages are based upon the total mass of the composition.
[0023] In an aspect, the present invention provides a bituminous rejuvenating agent is prepared by blending process wherein the aromatic extract, bitumen and bonding agent are combined together.
[0024] In an aspect, the present invention provides a bituminous rejuvenating agent can be used for a hot in-place recycling process and a hot in-plant recycling process.
[0025] In an embodiment, the present invention provides a process for a hot in-place recycling of a bituminous pavement, said process comprises the steps of.
a. heating and milling the distressed bituminous pavement;
b. heating a bituminous rejuvenating agent according to the invention;
c. adding the hot rejuvenating agent and required quantity of aggregate to the milled bituminous pavement and mixing to provide rejuvenated bituminous mix; and
d. forming a rejuvenated bituminous pavement with the rejuvenated bituminous mix.
[0026] In an embodiment, the present invention provides a process for a hot in-plant recycling of a bituminous pavement, said process comprises the steps of:
a. heating virgin aggregate,
b. heating a bituminous rejuvenating agent,
c. optionally, heating fresh bitumen, and
d. adding the hot rejuvenating the hot virgin aggregate and optionally, the hot bitumen to the reclaimed bituminous pavement, and mixing to provide rejuvenated bituminous mix.
[0027] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The following drawings form part of the present specification and are included to further illustrate aspects of the present invention. The disclosure may be better understood by reference to the drawings in combination with the detailed description of the specific embodiments presented herein.
[0029] Figure 1: Overview of the Reclamation and Recycling process

DETAILED DESCRIPTION OF THE INVENTION
[0030] 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 invention.
[0031] 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.
[0032] 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.
[0033] In some embodiments, numbers have been used for quantifying weight percentages, ratios, 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.
[0034] 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.
[0035] 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.
[0036] 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.”
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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 invention. These examples are provided for the purposes of explanation, and not of limitation, of those principles and of the disclosure.
[0041] It should also be appreciated that the present invention can be implemented in numerous ways, including as a system, a method or a device. In this specification, these implementations, or any other form that the invention may take, may be referred to as processes. In general, the order of the steps of the disclosed processes may be altered within the scope of the invention.
[0042] The headings and abstract of the invention provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.
[0043] 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.
[0044] Bitumen is a viscous liquid, semi-solid or solid consisting essentially of hydrocarbons. It softens gradually when heated and is soluble in trichloroethylene. Bitumen can be mixed with aggregate to provide bituminous mix. The term “bituminous mix” in the present context is used to describe a mixture of bitumen and aggregate.
[0045] The present invention provides a bituminous rejuvenating agent for bituminous and a method for recycling the bituminous pavement.
[0046] The bituminous rejuvenating agent has a viscosity of from 50 to 60000 cSt at 60 °C. A bituminous rejuvenating agent having viscosity above 60000 cSt is not beneficial because a significant quantity of rejuvenating agent is required to improve the properties of the Reclaimed asphalt pavement (known as RAP) and the proportion of recycled material in the rejuvenated bituminous pavement is resultingly low. Decreasing the viscosity of the bituminous rejuvenating agent decreases the amount of rejuvenating agent required to rejuvenate a particular quantity of RAP. Rejuvenating agents having a viscosity below 50 cSt are unlikely to be useful as they contain insufficient quantities of advantageous chemical components and are therefore unlikely to achieve the desired improvement in bituminous mix properties.
[0047] The preferred viscosity of the bituminous rejuvenating agent will depend upon its intended application. Lower viscosity rejuvenating agents are preferred for hot in-place recycling and higher viscosity rejuvenating agents are preferred for hot in-plant recycling. The bituminous rejuvenating agent of the present invention can have a wide range of viscosities, thereby providing rejuvenating agents that are suitable for use in hot in-place and hot in-plant recycling for hot in-place recycling preferably the viscosity of the bituminous rejuvenating agent is above 150 cSt, most preferably above 175 cSt and below 900 cSt and most preferably below 600 cSt. The most preferred viscosity, range is 175 to 600 cSt.
[0048] For hot in-plant recycling, preferably the viscosity of the bituminous rejuvenating agent is above 4500 cSt and below 60000 cSt. A most preferred viscosity range is 4500 to 37500 cSt adapted to the final use of bituminous mix.
[0049] In an embodiment of the present invention, the bituminous rejuvenating agent comprises aromatic extract, bitumen and bonding agent, where the percentages are based upon the total mass of the composition.
[0050] In an embodiment of the present invention, the bitumen is present in an amount of 1% to 95% of the total mass of composition. For example, at least 1%, at least 5%, at least 10%, at least 15%, at least 20%, at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, or at least 95%. Preferably 4% to 94% of the total mass of composition.
[0051] In an embodiment of the present invention, the bitumen may be any paving grade bitumen. The viscosity value of the bitumen is preferably from 80 Pa.s to 480 Pa.s at 60 °C . Most preferably the viscosity value of the bitumen is from 360 Pa.s to 80 Pa.s at 60 °C. If the viscosity value is less than 100 Pa.s then a higher proportion the bitumen will be required to produce a bituminous rejuvenating agent with a viscosity in the required range
[0052] In an embodiment of the present invention, the aromatic extract is present in an amount of 1% to 95% of the total mass of composition. For example, at least 1%, at least 5%, at least 10%, at least 15%, at least 20%, at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, or at least 95%. Preferably 5% to 94% of the total mass of composition.
[0053] In an embodiment of the present invention, the aromatic extract is present in an amount of 0.01% to 1.0% of the total mass of composition. For example, at least 0.01%, at least 0.05%, at least 0.10%, at least 0.15%, at least 0.20%, at least 0.25%, at least 0.30%, at least 0.35%, at least 0.40%, at least 0.45%, at least 0.50%, at least 0.55%, at least 0.60%, at least 0.65%, at least 0.70%, at least 0.75%, at least 0.80%, at least 0.85%, at least 0.90%, at least 0.95%, or at least 1.0%. Preferably 0.1% to 1.0% of the total mass of composition.
[0054] In another embodiment of the present invention, the bituminous rejuvenating agent comprises 5-95% of aromatic extract, 94-4% of bitumen and 0.1-1.0% of bonding agent, wherein the percentages are based upon the total mass of the composition.
[0055] In an embodiment of the present invention, the bituminous rejuvenating agent comprises 65-90% of aromatic extract, and 10-35% of bitumen, wherein the percentages are based upon the total mass of the composition.
[0056] In an embodiment of the present invention, the bituminous rejuvenating agent is prepared by blending process wherein the aromatic extract, bitumen and bonding agent are combined together. A typical blending process would consists of heating bitumen to about 135 °C, adding aromatic extract at 60 ° C to 70 ° C temperature and blending for about 60 minutes at 130 °C until a homogenous product is obtained.
[0057] In an embodiment of the present invention, at least 90% of the bituminous rejuvenating agent comprises aromatic extract, and bitumen.
[0058] In an embodiment of the present invention, the bituminous rejuvenating agent comprises a viscosity range of 50 to 60000 cSt at 60°C.
[0059] In an embodiment of the present invention, the bituminous rejuvenating agent can be used for a hot in-place recycling process and a hot in-plant recycling process.
[0060] In an embodiment, the present invention provides a process for a hot in-place recycling of a bituminous pavement, said process comprises the steps of.
a. heating and milling the distressed bituminous pavement;
b. heating a bituminous rejuvenating agent according to the invention;
c. adding the hot rejuvenating agent and required quantity of aggregate to the milled bituminous pavement and mixing to provide rejuvenated bituminous mix; and
d. forming a rejuvenated bituminous pavement with the rejuvenated bituminous mix.
[0061] In an embodiment, the present invention provides a process for a hot in-plant recycling of a bituminous pavement, said process comprises the steps of:
e. heating virgin aggregate,
f. heating a bituminous rejuvenating agent,
g. optionally, heating fresh bitumen, and
h. adding the hot rejuvenating the hot virgin aggregate and optionally, the hot bitumen to the reclaimed bituminous pavement, and mixing to provide rejuvenated bituminous mix.
[0062] In an embodiment of the present invention, the recycled bituminous pavement is present in an amount of 10% to 80% of the total mass of the rejuvenated bituminous mix. For example, at least 1%, at least 5%, at least 10%, at least 15%, at least 20%, at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, or at least 80%. Preferably 10% to 60% of the total mass of the rejuvenated bituminous mix.
[0063] In an embodiment of the present invention, the virgin aggregate is present in an amount of 10% to 90% of the total mass of the rejuvenated bituminous mix. For example, at least 1%, at least 5%, at least 10%, at least 15%, at least 20%, at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, or at least 90%. Preferably 40% to 90% of the total mass of the virgin aggregate.
[0064] In an embodiment of the present invention, the bituminous rejuvenating agent plus any fresh bitumen is present in an amount of 1% to 20% of the total mass of the rejuvenated bituminous mix. For example, at least 1%, at least 2%, at least 3%, at least 4%, at least 5%, at least 6%, at least 7%, at least 8%, at least 9%, at least 10%, at least 11%, at least 12%, at least 13%, at least 14%, at least 15%, at least 16%, at least 18%, or at least 20%, or. Preferably 5% to 15% of the total mass of the rejuvenated bituminous mix. Adding less than 5 mass percent of rejuvenating agent is unlikely to achieve sufficient modification of the properties of the bituminous mix. Adding more than 15 mass percent decreases the proportion of the rejuvenated pavement that is recycled. The bituminous rejuvenating agent is heated to a temperature at which its viscosity is sufficient to achieve coating of the aggregates in the final bituminous mix.
[0065] In an embodiment of the present invention, the milled bituminous pavement, rejuvenating agent and, optionally virgin aggregate are mixed using standard techniques and apparatus and are formed into a rejuvenated bituminous pavement using standard techniques and apparatus.
[0066] It is preferred to maximise the proportion of reclaimed material (RAP) in the rejuvenated bituminous mix; but in practice it is difficult to achieve higher than 60 mass percent RAP content during hot in-plant recycling.
[0067] The RAP is preferably not directly heated during the process as this may burn the bitumen, and is preferably heated by transfer of heat from hot aggregate and hot rejuvenating agent. The bituminous rejuvenating agent is preferably heated to a temperature at which its viscosity is sufficient to achieve coating of the aggregates in the milled bituminous pavement. The virgin aggregate is preferably heated to a temperature of 160 to 180 ° C .
[0068] The components are mixed using standard techniques and apparatus and the rejuvenated bituminous mix can be used for the same purposes as standard bituminous mix.
[0069] The current invention could also be used for hot in-plant recycling with higher amounts, of RAP reuse (above 60% ) when the design of these plants will allow it.
[0070] In another embodiment, the present invention further provides a rejuvenated bituminous pavement produced by a process according to the invention and provides rejuvenated bituminous mix produced by a process according to the invention.
[0071] While the foregoing description discloses various embodiments of the disclosure, other and further embodiments of the invention may be devised without departing from the basic scope of the disclosure. 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.
EXAMPLES
[0072] The present invention 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.
[0073] Example 1: Preparation of Rejuvenating Agent
Bitumen was heated to 135 ° C in an oven. Aromatic extract at 60°C to 70°C temperature was added to bitumen. The bitumen and aromatic extract were blended at a temperature of 130°C using a conventional laboratory stirrer/mixer for 60 minutes at which point the product was homogenous.

The ratio of bitumen to aromatic extract were varied in order to obtain rejuvenating agents of different viscosity. Viscosity was measured in accordance with ASTMD 4402 (with a rotating spindle apparatus); this is dedicated to low viscosity measurements of complex fluids.
References:
1. ASTM D 4552/4552 M-10, Standard Practice for Classifying Hot-Mix Recycling Agents
2. IRC:120-2015, Recommended Practice for Recycling of Bituminous Pavements, Indian Roads Congress 2015
3. Asphalt Hot Mix Recycling, The Asphalt Handbook, The Asphalt Institute Manual Series No. 20 (MS-20), Second Edition, 2007
4. Hot In-Place Recycling, The Asphalt Handbook, The Asphalt Institute Manual Series (MS-4), Seventh Edition, 2007
5. Recycling of Bituminous Pavement, Page 242-248, Specification for Roads and Bridge Works, Fifth Revision, Indian Roads Congress, New Delhi, 2013
6. Kandhal P.S., “Recycling of Asphalt Pavement: An Overview of Current Practices”, Proceedings of the Second International Symposium on Maintenance and Rehabilitation of Pavements, Auburn, Alabama, 29 July – 1 August 2001
7. Kandhal P.S., “Recycling of Asphalt Pavement: An Overview”, Proceedings of the Indian Roads Congress, International Seminar on Innovations in Construction and Maintenance of Flexible Pavements, Agra, 2-4 September 2006
8. Rejuvenating Agents vs Recycling Agents in Hot Mix Asphalt (HMA) Design, Holly Frontier Lubricants and Specialty Products
9. Rejuvenators: Bring Life Back to Aging, Asphalt Pavement Magazine, July/August 2015
, Claims:1. A process for recycling a bituminous pavement, said process comprises the steps of
a. heating and milling the bituminous pavement
b. heating a bituminous rejuvenating agent, where the bituminous rejuvenating agent has a Viscosity from 50 to 60000 cSt at 60 °C and comprises 5-95 mass percent aromatic extract, 94-4 mass percent bitumen and 0.1-1.0 mass percent bonding agent, where the percentages are based upon the total mass of the composition.
c. adding the hot rejuvenating agent and optionally, aggregate to the milled bituminous pavement and mixing to provide rejuvenated bituminous mix and
d. forming a rejuvenated bituminous pavement with the rejuvenated bituminous mix.
2. A process as claimed in claim 1, wherein the amount of rejuvenating agent added to the milled bituminous pavement is in the range of from 5 to 15 mass percent based upon the weight of rejuvenated bituminous mix.
3. A process for recycling reclaimed bituminous pavement, said process comprises the steps of:
a. heating virgin aggregate, heating a bituminous rejuvenating agent wherein the bituminous rejuvenating agent has a viscosity of from 50 to 60000 cSt at 60 °C comprises 5-95 mass percent aromatic extract, 94-4 mass percent bitumen and 0.1-1.0 mass percent bonding agent, where the percentages are based upon the total weight of the composition, and optionally, heating fresh bitumen, and
b. adding the hot rejuvenating the hot virgin aggregate and optionally, the hot bitumen to the reclaimed bituminous pavement, and mixing to provide rejuvenated bituminous mix.
4. A process as claimed in claim 3, wherein the amount of recycled bituminous pavement is from 10 to 60 mass percent. The amount of virgin aggregate is from 40 to 90 mass percent and the amount of rejuvenating agent plus any fresh bitumen is from 5 to 15 mass percent, wherein all, mass percentages are based upon the total mass of the rejuvenated bituminous mix.
5. A process as claimed in claim 1, wherein the bituminous rejuvenating agent comprises 65 to 90 mass percent aromatic extract and 10 to 35 mass percent bitumen.
6. A process as claimed in claim 1, wherein 90 mass percent of the bituminous rejuvenating agent consists of aromatic extract and bitumen.
7. A rejuvenated bituminous pavement produced by a process as claimed in claim 1.
8. A rejuvenated bituminous mix produced by a process as claimed in claim 1.
9. A process as claimed in claim 2, wherein the bituminous rejuvenating agent comprises 65 to 90 mass percent aromatic extract and 10 to 35 mass percent bitumen.
10. A process as claimed in claim 3, wherein the bituminous rejuvenating agent comprises 65 to 90 mass percent aromatic extract and 10 to 35 mass percent bitumen.
11. A process as claimed in claim 4, wherein the bituminous rejuvenating agent comprises 65 to 90 mass percent aromatic extract and 10 to 35 mass percent bitumen.
12. A process as claimed in claim 2, wherein 90 mass percent of the bituminous rejuvenating agent consists of aromatic extract and bitumen.
13. A process as claimed in claim 3, wherein 90 mass percent of the bituminous rejuvenating agent consists of aromatic extract and bitumen.
14. A process as claimed in claim 4, wherein 90 mass percent of the bituminous rejuvenating agent consists of aromatic extract and bitumen.
15. A process as claimed in claim 5, wherein 90 mass percent of the bituminous rejuvenating agent consists of aromatic extract and bitumen.
16. A rejuvenated bituminous pavement produced by a process as claimed in claim 2.
17. A rejuvenated bituminous pavement produced by a process as claimed in claim 3.
18. A rejuvenated bituminous pavement produced by a process as claimed in claim 4.
19. A rejuvenated bituminous mix produced by a process as claimed in claim 2.
20. A rejuvenated bituminous mix produced by a process as claimed in claim 3.