CN110590221B - Environment-friendly recycled asphalt concrete and preparation method thereof - Google Patents
Environment-friendly recycled asphalt concrete and preparation method thereof Download PDFInfo
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- CN110590221B CN110590221B CN201910943805.2A CN201910943805A CN110590221B CN 110590221 B CN110590221 B CN 110590221B CN 201910943805 A CN201910943805 A CN 201910943805A CN 110590221 B CN110590221 B CN 110590221B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
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.
Description
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 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, a pitch complex and a plasticizer, the base oil: asphalt compound: the mass ratio of the plasticizer 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 of the regeneration 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 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 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 a modifier, an anti-aging agent and a plasticizer 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 JTGF40-2004 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".
Example 1
A regenerant comprises 60 parts of base oil, 36 parts of asphalt compound and 4 parts of epoxidized soybean oil 2-ethylhexyl ester, wherein the base oil is prepared from 60 parts of waste animal and vegetable oil, 20 parts of distillate oil, 2 parts of extract oil and 20 parts of aromatic oil.
The preparation method of the base oil component comprises the following steps: filtering waste animal and vegetable oil, low-temperature flash evaporating for dewatering, and mixing with distillate oil, extract oil and aromatic oil to obtain base oil component.
Wherein the asphalt compound consists of 40 parts of modified biological asphalt, 50 parts of 90# matrix asphalt and 5 parts of microcapsules.
The preparation method of the modified biological asphalt comprises the following steps: firstly, filtering a certain amount of biological asphalt, carrying out low-temperature flash evaporation dehydration treatment, then adding benzyl acrylic acid accounting for 5% of the mass of the biological asphalt, calcium ricinoleate accounting for 3% of the mass of the biological asphalt and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite accounting for 3% of the mass of the biological asphalt under a heating state (50 ℃), and uniformly mixing to prepare the modified biological asphalt.
The preparation method of the asphalt compound comprises the following steps: heating the matrix asphalt to a fluid state, adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, adding the microcapsule, and uniformly mixing to form an asphalt compound;
the preparation method of the regenerant comprises the following steps: heating the asphalt compound to a fluid state, then adding the base oil component (preheated to 60 ℃) and the epoxidized soybean oil 2-ethylhexyl ester, mixing uniformly, and cooling to room temperature to form the regenerant 1.
Example 2
A regenerant comprises 50 parts of base oil, 32 parts of asphalt compound and 3 parts of epoxy linseed oil, wherein the base oil is prepared from 50 parts of waste animal and vegetable oil, 30 parts of distillate oil, 3 parts of extract oil and 25 parts of aromatic oil.
The preparation method of the base oil component comprises the following steps: filtering waste animal and vegetable oil, low-temperature flash evaporating for dewatering, and mixing with distillate oil, extract oil and aromatic oil to obtain base oil component.
Wherein the asphalt compound consists of 20 parts of modified biological asphalt, 65 parts of 110# matrix asphalt and 8 parts of microcapsules.
The preparation method of the modified biological asphalt comprises the following steps: firstly, filtering a certain amount of biological asphalt, carrying out low-temperature flash evaporation dehydration treatment, then adding 1% of benzyl acrylic acid, 4% of calcium ricinoleate and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite in the mass of the biological asphalt under the heating state (65 ℃), and uniformly mixing to prepare the modified biological asphalt.
The preparation method of the asphalt compound comprises the following steps: heating the matrix asphalt to a fluid state, adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, adding the microcapsule, and uniformly mixing to form an asphalt compound;
the preparation method of the regenerant comprises the following steps: heating the asphalt compound to a fluid state, then adding the base oil component (preheated to 60 ℃) and the epoxy linseed oil, mixing uniformly, and cooling to room temperature to form the regenerant 2.
Example 3
The regenerant consists of 70 parts of base oil, 30 parts of asphalt compound and 5 parts of 2-ethylhexyl diphenyl phosphate, wherein the base oil is prepared from 50 parts of waste animal and vegetable oil, 25 parts of distillate oil, 5 parts of extract oil and 30 parts of aromatic oil.
The preparation method of the base oil component comprises the following steps: filtering waste animal and vegetable oil, low-temperature flash evaporating for dewatering, and mixing with distillate oil, extract oil and aromatic oil to obtain base oil component.
Wherein the asphalt compound consists of 30 parts of modified biological asphalt, 80 parts of No. 90 matrix asphalt and 10 parts of microcapsule.
The preparation method of the modified biological asphalt comprises the following steps: firstly, filtering a certain amount of biological asphalt, carrying out low-temperature flash evaporation dehydration treatment, then adding benzyl alcohol accounting for 3 percent of the mass of the biological asphalt, calcium ricinoleate accounting for 2 percent of the mass of the biological asphalt and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite accounting for 5 percent of the mass of the biological asphalt under a heating state (80 ℃), and uniformly mixing to prepare the modified biological asphalt.
The preparation method of the asphalt compound comprises the following steps: heating the matrix asphalt to a fluid state, adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, adding the microcapsule, and uniformly mixing to form an asphalt compound;
the preparation method of the regenerant comprises the following steps: heating the asphalt compound to a fluid state, then adding the base oil component (preheated to 50 ℃) and 2-ethylhexyl diphenyl phosphate, mixing uniformly, and cooling to room temperature to form the regenerant 3.
Example 4
A regenerant comprises 80 parts of base oil component, 32 parts of asphalt compound and 5 parts of dioctyl azelate, wherein the base oil component is prepared from 60 parts of waste animal and vegetable oil, 26 parts of distillate oil, 1 part of extract oil and 22 parts of aromatic oil.
The preparation method of the base oil component comprises the following steps: filtering waste animal and vegetable oil, low-temperature flash evaporating for dewatering, and mixing with distillate oil, extract oil and aromatic oil to obtain base oil component.
Wherein the asphalt compound consists of 40 parts of modified biological asphalt, 90 parts of 110# matrix asphalt and 10 parts of microcapsules.
The preparation method of the modified biological asphalt comprises the following steps: firstly, filtering a certain amount of biological asphalt, carrying out low-temperature flash evaporation dehydration treatment, then adding benzyl alcohol accounting for 1 percent of the mass of the biological asphalt, calcium ricinoleate accounting for 3 percent of the mass of the biological asphalt and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite accounting for 3 percent of the mass of the biological asphalt under a heating state (80 ℃), and uniformly mixing to prepare the modified biological asphalt.
The preparation method of the asphalt compound comprises the following steps: heating the matrix asphalt to a fluid state, adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, adding the microcapsule, and uniformly mixing to form an asphalt compound;
the preparation method of the regenerant comprises the following steps: heating the asphalt compound to a fluid state, then adding the base oil component (preheated to 55 ℃) and the dioctyl azelate, mixing uniformly, and cooling to room temperature to form the regenerant 4.
Example 5
The regenerant consists of 60 parts of base oil, 40 parts of asphalt compound and 4 parts of epoxidized triglyceride, wherein the base oil is prepared from 60 parts of waste animal and vegetable oil, 20 parts of distillate oil, 3 parts of extract oil and 30 parts of aromatic oil.
The preparation method of the base oil component comprises the following steps: filtering waste animal and vegetable oil, low-temperature flash evaporating for dewatering, and mixing with distillate oil, extract oil and aromatic oil to obtain base oil component.
Wherein the asphalt compound consists of 25 parts of modified biological asphalt, 80 parts of No. 130 matrix asphalt and 5 parts of microcapsule.
The preparation method of the modified biological asphalt comprises the following steps: firstly, filtering a certain amount of biological asphalt, carrying out low-temperature flash evaporation dehydration treatment, then adding benzyl acrylic acid accounting for 3% of the mass of the biological asphalt, calcium ricinoleate accounting for 3% of the mass of the biological asphalt and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite accounting for 3% of the mass of the biological asphalt under a heating state (40 ℃), and uniformly mixing to prepare the modified biological asphalt.
The preparation method of the asphalt compound comprises the following steps: heating the matrix asphalt to a fluid state, adding the modified biological asphalt, uniformly mixing the matrix asphalt and the modified biological asphalt, adding the microcapsule, and uniformly mixing to form an asphalt compound;
the preparation method of the regenerant comprises the following steps: heating the asphalt compound to a fluid state, then adding the base oil component (preheated to 60 ℃) and the epoxidized triglyceride, mixing uniformly, and cooling to room temperature to form the regenerant 5.
Example 6
The environment-friendly recycled asphalt concrete is prepared from the following raw materials in parts by weight:
3 parts of the recycling agent 1 prepared in example 1, 10 parts of aggregate, 50 parts of basalt, 5 parts of No. 70 asphalt, 3 parts of filler, 45 parts of RAP material, 1.5 parts of linear SBS, 1.5 parts of anti-aging agent, 4 parts of epoxidized soybean oil 2-ethylhexyl ester and 2 parts of Sasobit warm mix agent.
The aggregate is steel slag wrapped with cement, soil, water and a soil curing agent, wherein the proportion of the soil, the water, the soil curing agent, the cement and the steel slag is 100: 15: 1: 5: 70;
the preparation method of the aggregate comprises the following steps: preparing steel slag particles, then adding cement, a soil curing agent and water into soil, then uniformly stirring, quickly adding the steel slag for stirring to wrap the steel slag, and then quickly sieving and separating the steel slag particles wrapped with the soil, the cement and the soil curing agent to serve as aggregate.
The filler is a mixture of mineral powder, carbon black and graphene powder, wherein the proportion of the mineral powder, the carbon black and the graphene powder is 95: 5: 0.3;
the RAP material is a milling material of an original asphalt pavement (an old asphalt pavement of a highway, which is cracked in a large area and needs to be repaired);
the anti-aging agent is a mixture of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate, wherein the proportion of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate is 1: 1: 1. the preparation method of the environment-friendly recycled asphalt concrete with the raw material ratio 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 basalt and the aggregate according to the AC-16 gradation, and heating to 180 ℃ to obtain a mixture;
(3) heating the No. 70 asphalt to a fluid state, and adding the linear SBS, the anti-aging agent and the epoxidized soybean oil 2-ethylhexyl ester 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 1.
Example 7
The environment-friendly recycled asphalt concrete is prepared from the following raw materials in parts by weight:
3 parts of the regenerant prepared in example 2, 2 parts of aggregate, 50 parts of limestone, 5 parts of No. 70 asphalt, 5 parts of filler, 60 parts of RAP material, 1.5 parts of PE, 1.5 parts of age resistor, 4 parts of modified triglyceride and 2 parts of Sasobit warm mix.
The aggregate is steel slag wrapped with cement, soil, water and a soil curing agent, wherein the proportion of the soil, the water, the soil curing agent, the cement and the steel slag is 100: 15: 1: 5: 60, adding a solvent to the mixture;
the preparation method of the aggregate comprises the following steps: preparing steel slag particles, then adding cement, a soil curing agent and water into soil, then uniformly stirring, quickly adding the steel slag for stirring to wrap the steel slag, and then quickly sieving and separating the steel slag particles wrapped with the soil, the cement and the soil curing agent to serve as aggregate.
The filler is a mixture of mineral powder, carbon black and graphene powder, wherein the proportion of the mineral powder, the carbon black and the graphene powder is 95: 5: 0.5;
the RAP material is a milling material of an original asphalt pavement (an old asphalt pavement of a highway, which is cracked in a large area and needs to be repaired);
the anti-aging agent is a mixture of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate, wherein the proportion of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate is 1: 1: 2.
the preparation method of the environment-friendly recycled asphalt concrete with the raw material ratio 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 limestone and the aggregate according to the AC-16 gradation, and heating to 180 ℃ to obtain a mixture;
(3) heating No. 70 asphalt to a fluid state, and adding PE, an anti-aging agent and modified triglyceride 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 2.
Example 8
The environment-friendly recycled asphalt concrete is prepared from the following raw materials in parts by weight:
3 parts of the regenerant prepared in example 3, 3 parts of aggregate, 50 parts of granite, 5 parts of No. 90 asphalt, 3 parts of filler, 45 parts of RAP material, 1.5 parts of rubber powder, 1.5 parts of anti-aging agent, 5 parts of 2-ethylhexyl diphenyl phosphate and 5 parts of Evothern warm mix.
The aggregate is coal gangue wrapped with cement, soil, water and a soil curing agent, wherein the proportion of the soil, the water, the soil curing agent, the cement and the coal gangue is 100: 15: 1: 5: 80;
the preparation method of the aggregate comprises the following steps: preparing coal gangue particles, then adding cement, a soil curing agent and water into soil, then uniformly stirring, quickly adding and stirring coal gangue to wrap the coal gangue, and then quickly sieving and separating the coal gangue particles wrapped with the soil, the cement and the soil curing agent to serve as aggregate.
The filler is a mixture of mineral powder, carbon black and graphene powder, wherein the proportion of the mineral powder, the carbon black and the graphene powder is 95: 2: 0.3;
the RAP material is a milling material of an original asphalt pavement (a first-grade old asphalt pavement needing to be repaired after large-area cracking);
the anti-aging agent is a mixture of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate, wherein the proportion of octadecyl 3, 5-di-tert-butyl-4-hydroxybenzyl phosphate, dilauryl thiodipropionate and p-tert-butyl salicylate is 5: 2: 3.
the preparation method of the environment-friendly recycled asphalt concrete with the raw material ratio 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 granite and the aggregate according to the AC-20 gradation, and heating to 180 ℃ to obtain a mixture;
(3) heating 90# asphalt to a fluid state, and then adding rubber powder, an anti-aging agent and 2-ethylhexyl diphenyl phosphate 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 3.
Example 9
The environment-friendly recycled asphalt concrete is prepared from the following raw materials in parts by weight:
3 parts of the rejuvenating agent prepared in example 4, 25 parts of aggregate, 50 parts of basalt, 5 parts of # 90 asphalt, 3 parts of filler, 70 parts of RAP material, 1.5 parts of linear SBS, 1.5 parts of anti-aging agent, 4 parts of epoxy linseed oil and 2 parts of Evothern warm mix.
The aggregate is steel slag and coal gangue wrapped with cement, soil, water and a soil curing agent, wherein the proportion of the soil, the water, the soil curing agent, the cement, the steel slag and the coal gangue is 100: 15: 1: 5: 65;
the preparation method of the aggregate comprises the following steps: preparing steel slag particles and coal gangue particles, then adding cement, a soil curing agent and water into soil, then uniformly stirring, rapidly adding the steel slag and the coal gangue, stirring to coat the steel slag and the coal gangue, and rapidly sieving to separate the steel slag and coal gangue particles coated with the soil, the cement and the soil curing agent to serve as aggregate.
The filler is a mixture of mineral powder, carbon black and graphene powder, wherein the proportion of the mineral powder, the carbon black and the graphene powder is 95: 5: 0.1;
the RAP material is a milling material of an original asphalt pavement (an old asphalt pavement of a second-level highway which is cracked in a large area and needs to be repaired);
the anti-aging agent is a mixture of an antioxidant 1010 and an antioxidant 168, wherein the ratio of the antioxidant 1010 to the antioxidant 168 is 1: 1.
the preparation method of the environment-friendly recycled asphalt concrete with the raw material ratio 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 basalt and the aggregate according to the AC-20 gradation, and heating to 180 ℃ to obtain a mixture;
(3) heating 90# asphalt to be in a fluid state, and then adding linear SBS, anti-aging agent and epoxy linseed oil 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 4.
Example 10
The environment-friendly recycled asphalt concrete is prepared from the following raw materials in parts by weight:
3 parts of regenerant 5 prepared in example 5, 30 parts of aggregate, 45 parts of basalt and granite (the mass ratio of the two is 1: 1), 5 parts of 90# asphalt, 3 parts of filler, 60 parts of RAP material, 1.5 parts of linear SBS, 5 parts of anti-aging agent, 4 parts of dioctyl azelate and 5 parts of Evotern warm-mix agent.
The aggregate is steel slag and coal gangue wrapped with cement, soil, water and a soil curing agent, wherein the proportion of the soil, the water, the soil curing agent, the cement, the steel slag and the coal gangue is 100: 15: 1: 5: 70;
the preparation method of the aggregate comprises the following steps: preparing steel slag particles and coal gangue particles, then adding cement, a soil curing agent and water into soil, then uniformly stirring, rapidly adding the steel slag and the coal gangue, stirring to coat the steel slag and the coal gangue, and rapidly sieving to separate the steel slag and coal gangue particles coated with the soil, the cement and the soil curing agent to serve as aggregate.
The filler is a mixture of mineral powder, carbon black and graphene powder, wherein the proportion of the mineral powder, the carbon black and the graphene powder is 95: 5: 0.3;
the RAP material is a milling material of an original asphalt pavement (an old asphalt pavement of a three-level highway with large-area cracking and needing to be repaired);
the anti-aging agent is a mixture of an antioxidant 1010 and an antioxidant 168, wherein the ratio of the antioxidant 1010 to the antioxidant 168 is 1: 2.
the preparation method of the environment-friendly recycled asphalt concrete with the raw material ratio comprises the following steps:
(1) heating RAP material, loosening, adding warm mixing agent, mixing, adding regenerant, and mixing to obtain mixture;
(2) uniformly mixing new aggregates (basalt and granite) and aggregates according to the AC-25 gradation, and heating to 180 ℃ to obtain a mixture;
(3) heating 70# asphalt to be in a fluid state, and then adding linear SBS, anti-aging agent and dioctyl azelate 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 5.
The regenerants prepared in examples 1-5 were tested for performance according to the "NB/SH/T0819-2010 asphalt regenerant for hot mix" standard, and the test results are shown in tables 1-2.
TABLE 1 EXAMPLES 1-5 regenerant indices
| Item | Viscosity Pa.s at 60 DEG C | Flash point. C | Percent by saturation | The fragrance is divided into% | Mass change of TFOT% |
| Regenerant 1 | 67.4 | 304 | 22 | 45 | 1.04 |
| Regenerant 2 | 66.8 | 298 | 23 | 42 | 1.08 |
| Regenerant 3 | 66.6 | 286 | 22 | 41 | 1.14 |
| Regenerant 4 | 63.4 | 280 | 26 | 38 | 1.24 |
| Regenerant 5 | 65.2 | 286 | 24 | 40 | 1.44 |
| Technical requirements | 50-175 | ≥220 | ≤30 | ≥30 | ≤4 |
The regenerants prepared in examples 1-5 were allowed to stand, the densities of the upper and lower layers were measured, and the results of the measurement of the difference in the densities of the upper and lower layers are shown in table 2.
Table 2 examples 1-5 regenerant system stability
Old asphalt is extracted from old asphalt pavement milling stock (RAP), and the regenerants prepared in examples 1-5 are respectively added, wherein the mixing amount of the regenerant is 8-10% of the content of the old asphalt, and the mixture is uniformly mixed to form regenerated asphalt 1-5 (namely, the regenerated asphalt is prepared by adding the regenerant into the old asphalt).
TABLE 3 index of recycled asphalt
| Item | Mixing amount/% | Penetration at 25 ℃ | Softening point | Ductility at 5 DEG C |
| Reclaimed asphalt 1 | 8 | 67.9dmm | 56.5℃ | 34.6cm |
| Reclaimed asphalt 2 | 8 | 65.4dmm | 58.0℃ | 31.1cm |
| Reclaimed asphalt 3 | 9 | 67.2dmm | 57.0℃ | 32.7cm |
| Reclaimed asphalt 4 | 10 | 72.6dmm | 54.5℃ | 44.6cm |
| Reclaimed asphalt 5 | 10 | 71.8dmm | 56.0℃ | 42.7cm |
The environment-friendly recycled asphalt concrete prepared in the examples 6 to 10 was subjected to a mixture performance test, and after accelerated aging (aging according to the accelerated aging method of the hot-mix asphalt mixture of "T0734 to 2000"), the mixture performance test was performed again, and the test results are shown in table 4, which shows that the performance indexes of the asphalt concrete prepared in the examples 6 to 10 of the present invention before and after aging are almost unchanged, confirming that the environment-friendly recycled asphalt concrete of the present invention has good aging resistance.
TABLE 4 recycled asphalt concrete Properties before and after aging
The experimental results show that the regenerant disclosed by the invention is low in viscosity and convenient to construct, the high aromatic content is beneficial to recovering the performance of the old asphalt, the quality loss after aging is far less than the related requirements, and the regenerant has good aging resistance. The index of the reclaimed asphalt can reach the technical index of 70# asphalt (the penetration range of 70# asphalt is 60-80dmm), and the regenerant has good regeneration effect on old asphalt. The performance of the recycled asphalt mixture is far higher than the technical requirements of the national standard on the modified asphalt.
Claims (14)
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;
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 in parts 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 C10-C16 alkyl phosphite;
the microcapsule is composed of a polyethylene elastomer as a shell and aromatic oil as a core material;
the benzyl compound is benzyl methanol and/or benzyl acrylic acid.
2. The recycling agent according to claim 1, wherein the plasticizer 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.
3. The rejuvenating agent according to claim 2, wherein said base asphalt is 90#, 110# and/or 130# asphalt.
4. The regenerant according to any one of claims 1 to 3, wherein the regenerant has a viscosity of 60 to 90 Pa-s at 60 ℃, a flash point of 270-380 ℃, a saturation fraction of 10 to 25%, an aromatic fraction of 35 to 70%, and a TFOT content of 0.8 to 2%.
5. The regenerant according to any one of claims 1-3, wherein the regenerant is prepared by the following method:
(1) preparing modified biological asphalt: firstly, filtering biological asphalt, carrying out low-temperature flash evaporation dehydration treatment, then adding a benzyl compound, calcium ricinoleate and 4, 4-diisopropyl bisphenol C10-C16 alkyl phosphite at 40-80 ℃, and uniformly mixing to prepare 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 at 50-60 ℃, uniformly mixing, and cooling to form the regenerant.
6. 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 according to any one of claims 1-3, 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 and 1-5 parts of warm-mixing agent;
the aggregate is steel slag and/or coal gangue wrapped with soil and cement; the new aggregate is basalt, limestone and/or granite.
7. The recycled asphalt concrete according to claim 6, wherein the new asphalt is 70# and/or 90# base asphalt.
8. The recycled asphalt concrete according to claim 7, 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.
9. The recycled asphalt concrete according to claim 8, wherein the modifier is one or more of SBS, SBR, rubber powder and PE.
10. The recycled asphalt concrete according to claim 9, 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.
11. The recycled asphalt concrete according to claim 10, wherein the plasticizer 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.
12. The recycled asphalt concrete according to claim 11, wherein the warm-mix agent is a Sasobit and/or evotherm warm-mix agent.
13. The recycled asphalt concrete according to claim 12, 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 a modifier, an anti-aging agent and a plasticizer 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.
14. Use of the recycled asphalt concrete according to any one of claims 6 to 13.
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| CN111662556A (en) * | 2020-07-15 | 2020-09-15 | 辽宁省交通科学研究院有限责任公司 | Efficient asphalt regenerant for large-proportion thermally-regenerated asphalt concrete and preparation method thereof |
| CN112811854B (en) * | 2021-01-13 | 2022-03-29 | 武汉理工大学 | Flame-retardant warm-mixing induction heating self-healing asphalt concrete and preparation method thereof |
| CN113248809A (en) * | 2021-04-09 | 2021-08-13 | 重庆交通大学 | Plasticizing modified warm-mix agent and warm-mix asphalt preparation method |
| CN114539722A (en) * | 2022-01-23 | 2022-05-27 | 山西省交通科技研发有限公司 | Slow-release regenerant suitable for plant-mixed heat regeneration and preparation method thereof |
| CN115895285A (en) * | 2022-11-22 | 2023-04-04 | 湖南沿湖建设工程有限公司 | Dual-regeneration SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
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