阅读说明：本技术 一种环保型再生沥青混凝土及其制备方法 (Environment-friendly recycled asphalt concrete and preparation method thereof ) 是由 王宏民 李鹏 李群锋 郭月哲 张花 武永明 李军发 郭万林 刘宇鹏 于 2019-09-30 设计创作，主要内容包括：本发明属于再生沥青混凝土技术领域,具体公开了一种环保型再生沥青混凝土及其制备方法,该混凝土由1-5份再生剂、10-30份骨料、25-50份新集料、4-6份新沥青、1-10份填料、45-70份RAP料、1-5份改性剂、1-5份抗老剂、1-5份增塑剂A和1-5份温拌剂组成。本发明开发出一种性能优异且充分利用废旧资源的再生剂,不仅可使RAP料的利用率在50%以上,并且实现了钢渣、煤矸石等工业固废的有效利用,节约了石灰岩、玄武岩等新集料的使用,对提高我国沥青路面再生技术的环保性、高效性发展是一种很好的实践。(The invention belongs to the technical field of recycled asphalt concrete, and particularly discloses environment-friendly recycled asphalt concrete and a preparation method thereof, wherein the concrete is composed of 1-5 parts of a recycling agent, 10-30 parts of aggregate, 25-50 parts of new aggregate, 4-6 parts of new asphalt, 1-10 parts of filler, 45-70 parts of RAP material, 1-5 parts of a modifier, 1-5 parts of an anti-aging agent, 1-5 parts of a plasticizer A and 1-5 parts of a warm mixing agent. The invention develops the regenerant which has excellent performance and fully utilizes waste resources, not only can ensure that the utilization rate of RAP materials is more than 50 percent, but also realizes the effective utilization of industrial solid wastes such as steel slag, coal gangue and the like, saves the use of new aggregates such as limestone, basalt and the like, and is a good practice for improving the environmental protection and the high-efficiency development of the asphalt pavement regeneration technology in China.)

1. The regenerant is characterized by being prepared from the following raw materials in parts by weight: 50-80 parts of base oil, 30-40 parts of asphalt compound and 1-5 parts of plasticizer B;

the base oil component is prepared from the following raw materials in parts by weight: 50-60 parts of waste animal and vegetable oil, 20-30 parts of distillate oil, 1-5 parts of extract oil and 20-30 parts of aromatic oil;

the asphalt compound is prepared from the following raw materials in parts by weight: 10-40 parts of modified biological asphalt, 50-90 parts of matrix asphalt and 1-10 parts of microcapsule;

the modified biological asphalt is prepared from the following raw materials, by weight, 100 parts of biological asphalt, 1-5 parts of benzyl compound, 1-5 parts of calcium ricinoleate and 1-5 parts of 4, 4-diisopropyl bisphenol phosphate C10 ~ C16 alkyl ester;

the microcapsule is composed of a polyethylene elastomer as a shell and aromatic oil as a core material.

2. The rejuvenating agent according to claim 1, wherein said benzyl compound is benzyl carbinol and/or benzyl acrylic acid.

3. The recycling agent according to claim 2, wherein the plasticizer B is selected from one or more of epoxidized triglyceride, epoxidized soybean oil 2-ethylhexyl ester, epoxidized linseed oil, dioctyl azelate and 2-ethylhexyl diphenyl phosphate.

4. The rejuvenating agent according to claim 3, wherein said base asphalt is 90#, 110# and/or 130# asphalt.

5. The recycling agent as set forth in any one of claims 1 to 4, wherein the recycling agent has a viscosity of 60 to 90 Pa-s at 60 ℃, a flash point of 270-380 ℃, a saturation component content of 10 to 25%, an aromatic component content of 35 to 70%, and a TFOT content of 0.8 to 2%.

6. The regenerant according to any one of claims 1-4, wherein the regenerant is prepared by the following method:

(1) the preparation of the modified biological asphalt comprises the steps of filtering the biological asphalt, carrying out low-temperature flash evaporation and dehydration treatment, adding a benzyl compound, calcium ricinoleate and 4, 4-diisopropyl bisphenol C10 ~ C16 alkyl phosphite at 40-80 ℃, and uniformly mixing to prepare the modified biological asphalt;

(2) preparation of asphalt compound: firstly, heating the matrix asphalt to be in a fluid state, then adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, then adding the microcapsule, and uniformly mixing to form an asphalt compound;

(3) preparation of base oil: filtering waste animal and vegetable oil, performing low-temperature flash evaporation and dehydration, and uniformly mixing the waste animal and vegetable oil with distillate oil, extract oil and aromatic oil to form base oil component;

(4) preparation of the regenerant: heating the asphalt compound to a fluid state, sequentially adding the base oil component and the plasticizer B at 50-60 ℃, uniformly mixing, and cooling to form the regenerant.

7. The environment-friendly recycled asphalt concrete is characterized by being prepared from the following raw materials in parts by weight: 1-5 parts of the regenerant as defined in any one of claims 1 to 4, 10-30 parts of aggregate, 25-50 parts of fresh aggregate, 4-6 parts of fresh asphalt, 1-10 parts of filler, 45-70 parts of RAP material, 1-5 parts of modifier, 1-5 parts of age inhibitor, 1-5 parts of plasticizer A and 1-5 parts of warm mixing agent.

8. The recycled asphalt concrete of claim 7, wherein the aggregate is steel slag and/or coal gangue coated with soil and cement.

9. The recycled asphalt concrete according to claim 8, wherein the new asphalt is 70# and/or 90# base asphalt and the new aggregate is basalt, limestone and/or granite.

10. The recycled asphalt concrete according to claim 9, wherein the filler is a mixture of 90-95 parts of mineral powder, 1-5 parts of carbon black and 0.1-1 part of graphene powder.

11. The recycled asphalt concrete according to claim 10, wherein the modifier is one or more of SBS, SBR, rubber powder and PE.

12. The recycled asphalt concrete according to claim 11, wherein the anti-aging agent is a mixture of 1-5 parts of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzylphosphate, 1-5 parts of dilauryl thiodipropionate and 1-5 parts of p-tert-butyl salicylate or a mixture of 1-5 parts of antioxidant 1010 and 1-5 parts of antioxidant 168.

13. The recycled asphalt concrete according to claim 12, wherein the plasticizer a is one or more selected from the group consisting of epoxidized triglycerides, epoxidized soybean oil 2-ethylhexyl ester, epoxidized linseed oil, dioctyl azelate and 2-ethylhexyl diphenyl phosphate.

14. The recycled asphalt concrete according to claim 13, wherein the warm-mix agent is a Sasobit and/or evotherm warm-mix agent.

15. The recycled asphalt concrete according to claim 14, wherein the preparation method of the recycled asphalt concrete comprises the following steps:

(1) heating RAP material, loosening, adding warm-mixing agent, mixing, adding regenerant, and mixing to obtain mixture;

(2) uniformly mixing the new aggregate and the aggregate according to a certain gradation and heating to obtain a mixture;

(3) heating the new asphalt to a fluid state, and then adding the modifier, the anti-aging agent and the plasticizer A to form modified asphalt;

(4) adding the modified asphalt obtained in the step (3) into the mixture obtained in the step (2), stirring, and adding a filler to form a modified asphalt mixture;

(5) and (3) uniformly mixing the modified asphalt mixture obtained in the step (4) and the mixture obtained in the step (1) to form the environment-friendly recycled asphalt concrete.

16. Use of the recycled asphalt concrete according to any one of claims 7 to 15.

Technical Field

The invention belongs to the technical field of recycled asphalt concrete, and particularly relates to environment-friendly recycled asphalt concrete and a preparation method thereof.

Background

With the high-speed development of road construction in China, high-grade roads built in 90 s of the 20 th century in China have entered the middle and major overhaul period successively. At present, the road construction and maintenance work in China is gradually shifted from a 'mainly constructed' stage to a 'repeatedly constructed and maintained' stage, and finally a 'mainly maintained' long-term continuous development stage is achieved. However, in the maintenance and repair process, the traditional process of patching, milling, planing and re-paving is generally adopted, so that the asphalt mixture cannot be recycled, and two problems are caused: firstly, the waste materials are abandoned and stacked to occupy a large amount of land, thereby causing environmental pollution; secondly, a large amount of old asphalt and old aggregate are not utilized, and resources are wasted. With the development of asphalt pavement maintenance technology and the enhancement of environmental protection consciousness of people in China, the traditional road maintenance mode cannot meet the practical needs of society, and as a green, environment-friendly and high-quality maintenance technology, the asphalt pavement regeneration technology is more and more emphasized by people.

At present, asphalt regenerants in the market are various in varieties, most of the asphalt regenerants are prepared by blending low-viscosity light oil such as waste engine oil and waste lubricating oil with a modifier and an anti-aging agent, and the regenerants have various problems in thermal stability and long-term performance. In the process of asphalt regeneration, the utilization rate of RAP materials is not high, and a large amount of new aggregates still need to be added, so that the problem of great supply and demand contradiction between road construction and natural stones is caused; on the other hand, the problem that a large amount of industrial wastes such as steel slag, coal gangue and the like cannot be effectively utilized exists in China, and the main factors for restricting the substances to become road building materials have the problems of strength and environmental protection. If the problems can be solved, a large amount of coal gangue and steel slag can replace new aggregates to be used as road building materials, and the high-quality development of the highway industry in China can be deeply influenced.

How to develop an environment-friendly recycled asphalt concrete which can realize the comprehensive utilization of wastes to the maximum extent and has excellent performance is a technical problem which needs to be solved urgently by the technical personnel in the field.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide environment-friendly recycled asphalt concrete. The invention develops the regenerant with excellent performance, not only enables the utilization rate of RAP materials to be more than 50%, but also realizes the effective utilization of industrial solid wastes such as steel slag, coal gangue and the like, saves the use of new aggregates such as limestone, basalt and the like, and is a good practice for improving the environmental protection and the high-efficiency development of the asphalt pavement regeneration technology in China.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:

the environment-friendly recycled asphalt concrete is prepared from the following raw materials in parts by weight: 1-5 parts of regenerant, 10-30 parts of aggregate, 25-50 parts of new aggregate, 4-6 parts of new asphalt, 1-10 parts of filler, 45-70 parts of RAP material, 1-5 parts of modifier, 1-5 parts of anti-aging agent, 1-5 parts of plasticizer A and 1-5 parts of warm mixing agent.

The viscosity of the regenerant at 60 ℃ is 60-90 Pa.s, the flash point is 270-380 ℃, the saturation content is 10-25%, the aromatic content is 35-70%, and the TFOT quality is 0.8-2%.

The regenerant consists of a base oil, an asphalt complex and a plasticizer B, wherein the base oil: asphalt compound: the mass ratio of the plasticizer B is as follows: (50-80):(30-40):(1-5).

Further, the base oil component consists of waste animal and vegetable oil, distillate oil, extract oil and aromatic oil, wherein the ratio of the waste animal and vegetable oil: distillate oil: extracting oil: the mass ratio of the aromatic oil is as follows: (50-60): (20-30): 1-5) (20-30), the waste animal and vegetable oil is filtered in advance and is subjected to flash evaporation dehydration treatment at low temperature (lower than 100 ℃). The preparation method of the base oil comprises the following steps: filtering and dewatering waste animal and vegetable oil, and mixing with distillate oil, extract oil and aromatic oil to form base oil component.

Further, the asphalt compound is composed of modified biological asphalt, matrix asphalt and microcapsules, wherein the modified biological asphalt: matrix asphalt: the mass ratio of the microcapsule is (10-40): (50-90): (1-10). The preparation method of the asphalt compound comprises the following steps: firstly, heating the matrix asphalt to be in a fluid state, then adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, then adding the microcapsule, and uniformly mixing to form the asphalt compound. The preparation method of the modified biological asphalt comprises the following steps: firstly, biological asphalt is filtered and subjected to low-temperature flash evaporation dehydration treatment, then benzyl compounds (such as benzyl alcohol or benzyl acrylic acid and the like), calcium ricinoleate and 4, 4-diisopropyl bisphenol phosphate C10-C16 alkyl ester are added under the heating state (40-80 ℃), and the mixture is uniformly mixed to prepare the modified biological asphalt, wherein the biological asphalt: a benzyl compound: calcium ricinoleate: the mass ratio of phosphorous acid 4, 4-diisopropyl bisphenol C10-C16 alkyl ester is 100: (1-5): (1-5): (1-5); the matrix asphalt is 90#, 110# and/or 130# asphalt; the microcapsule is composed of a polyethylene elastomer as a shell and aromatic oil as a core material.

Further, the plasticizer B in the regenerating agent is one or more selected from epoxidized triglyceride, epoxidized soybean oil 2-ethylhexyl ester, epoxidized linseed oil, dioctyl azelate and 2-ethylhexyl diphenyl phosphate.

Further, the preparation method of the regenerant comprises the following steps: heating the asphalt compound to a fluid state, sequentially adding the base oil component and the plasticizer B at 50-60 ℃, uniformly mixing, and cooling to form the regenerant.

The aggregate is steel slag and/or coal gangue wrapped with soil and cement, and the preparation method of the aggregate comprises the following steps: adding water, a soil curing agent and cement into soil, adding the steel slag and/or the coal gangue before hardening, uniformly mixing to enable a cured substance to be coated on the surface of the steel slag or the coal gangue, then quickly sieving and separately separating particles, thereby preparing the steel slag and/or the coal gangue coated with the cured substance with different particle sizes as aggregate. The soil is as follows: water: soil curing agent: cement: the mass ratio of the total amount of the steel slag and the coal gangue (the aggregate can only contain one of the steel slag and the coal gangue, namely one of the steel slag and the coal gangue is 0) is 100: (5-15): (0.01-4): (5-10): (50-80).

The new aggregate is basalt, limestone and/or granite.

The new asphalt is 70# and/or 90# base asphalt.

The filler is a mixture of mineral powder, carbon black and graphene powder, and the mass ratio of the mineral powder to the carbon black to the graphene is (90-95): (1-5): (0.1-1).

The RAP material is an original asphalt pavement milling material.

The modifier is one or more of SBS, SBR, rubber powder and PE.

The anti-aging agent is a mixture of 3, 5-di-tert-butyl-4-hydroxybenzyl octadecyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate, or a mixture of an antioxidant 1010 and an antioxidant 168, wherein the mass ratio of the 3, 5-di-tert-butyl-4-hydroxybenzyl octadecyl phosphate, the dilauryl thiodipropionate to the p-tert-butyl salicylate is (1-5): (1-5): (1-5), wherein the mass ratio of the antioxidant 1010 to the antioxidant 168 is (1-5): (1-5).

The plasticizer A is selected from one or more of epoxidized triglyceride, epoxidized soybean oil 2-ethylhexyl ester, epoxidized linseed oil, dioctyl azelate and 2-ethylhexyl diphenyl phosphate.

The warm mixing agent is Sasobit and/or Evotern warm mixing agent.

The preparation method of the environment-friendly recycled asphalt concrete comprises the following steps:

(1) heating RAP material, loosening, adding warm-mixing agent, mixing, adding regenerant, and mixing to obtain mixture;

(2) uniformly mixing the new aggregate and the aggregate according to a certain gradation and heating to obtain a mixture;

(3) heating the new asphalt to a fluid state, and then adding the modifier, the anti-aging agent and the plasticizer A to form modified asphalt;

(4) adding the modified asphalt obtained in the step (3) into the mixture obtained in the step (2), stirring, and adding a filler to form a modified asphalt mixture;

(5) and (3) uniformly mixing the modified asphalt mixture obtained in the step (4) and the mixture obtained in the step (1) to form the environment-friendly recycled asphalt concrete.

The environment-friendly recycled asphalt concrete can be used for any asphalt concrete pavement needing to be renovated, and can be used in high and medium grades.

By means of the technical scheme, the invention has the following beneficial effects:

the regenerant disclosed by the invention is excellent in performance and strong in environmental friendliness. The base oil component takes the waste animal and vegetable oil as a main component to realize waste utilization, and is combined with the distillate oil, the extract oil and the aromatic oil according to the proportion to play a role in regulating the proportion of straight-chain hydrocarbon, cyclic-chain hydrocarbon and aromatic hydrocarbon in the base oil component, so that the optimal state of viscosity, volatility and aromatic component content of a regenerant is realized, and the defect that the performance of a single component (high-grade asphalt, waste animal and vegetable oil, extract oil and the like) cannot be realized is avoided. In order to break the limitation that the traditional regenerant can only supplement aged asphalt light components, the regenerant is added with the asphalt compound, so that the regenerant has the effects of good stability, saving the consumption of new asphalt and improving the performance of an asphalt mixture. The biological asphalt has the characteristic of good compatibility with asphalt and base oil, and contains a large number of groups such as hydroxyl groups and the like, so that the fusion degree with the old asphalt can be increased, benzyl compounds such as benzyl methanol or benzyl acrylic acid and the like are added, and grafting of components with different molecular weights and molecular structures can be realized by utilizing more active hydrogen of the compounds, so that the fluidity and viscosity of a system are improved. The synergistic effect of calcium ricinoleate and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite can increase the stability of the system and enhance the durability. The microcapsule coated with the aromatic oil can play a role of slowly releasing the light components and continuously supplement the light components to realize the long-term use of the regenerated asphalt concrete pavement. The plasticizer used in the invention is nontoxic and environment-friendly, and has good compatibility with the system. The regenerant disclosed by the invention makes full use of waste resources, realizes changing waste into valuable, and is excellent in performance, strong in environmental friendliness, simple in preparation method and easy to popularize and apply.

The invention not only can recycle RAP material as much as possible, but also can consume industrial wastes such as steel slag, coal gangue and the like, and the heavy metals in the steel slag and the coal gangue are difficult to permeate out in a mode of solidifying and wrapping soil and cement, and the strength of the steel slag and the coal gangue is increased, thereby realizing the environmental protection recycling of the solid waste materials, replacing part of new aggregates with the materials, and effectively relieving the problem of great supply and demand contradiction between road construction and natural stones.

Besides conventional mineral powder, the filler used in the invention is also added with carbon black and graphene powder, and the carbon black and graphene powder play an important role in delaying the aging of the asphalt mixture and strengthening heat transfer besides playing a role of fine aggregate. The anti-aging agent is a non-toxic environment-friendly material, has good compatibility with the regenerant and the asphalt, and can enhance the anti-aging effect and prolong the service life of the regenerated pavement under the synergistic action of the anti-aging agent, the carbon black and the graphene powder.

Detailed Description

The present invention is further illustrated by the following examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the invention as claimed. Various changes or modifications may be made by those skilled in the art, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty, the equivalents of which fall within the scope of the claims appended hereto.

In the following examples and comparative examples, some of the starting materials are as follows:

the distillate oil, the extract oil and the aromatic oil are purchased from Hengshui Shengkang chemical Co., Ltd.

Biobitumen was purchased from Shandong ze Rui Biotech Ltd (examples 1-3) or Changchun Dai Kogyo Co Ltd (examples 4-5).

The microcapsule takes polyethylene elastomer as a shell and aromatic oil as a core material. The preparation method of the microcapsule comprises the following steps: firstly, heating and melting a polyethylene elastomer into a liquid state, then dispersing the polyethylene elastomer into fine particles, injecting air into the fine particles in a needle-shaped form while gradually cooling the fine particles to enable the polyethylene elastomer to become a film body containing air, then injecting aromatic oil, and then carrying out hot-melt indentation treatment on the injection position to enable the injection position to be closed, thereby completing the preparation of aromatic oil-wrapped microcapsules, wherein the shell of the prepared microcapsule is a spheroid with the particle size of 8-10mm, and the aromatic oil content of each microcapsule core material is 1-1.5 mL.

The cement is ordinary portland cement.

The screening process in the preparation of the aggregate refers to the technical specification of JTG F40-2004 highway asphalt pavement construction.

Other reagents are common commercial products.

In the following examples, "parts" of the non-written units are "parts by weight" and the proportions of the non-written units are "weight ratio".