CN114477855B - Recycled asphalt concrete and application thereof - Google Patents
Recycled asphalt concrete and application thereof Download PDFInfo
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- CN114477855B CN114477855B CN202210110193.0A CN202210110193A CN114477855B CN 114477855 B CN114477855 B CN 114477855B CN 202210110193 A CN202210110193 A CN 202210110193A CN 114477855 B CN114477855 B CN 114477855B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a recycled asphalt concrete and application thereof, wherein the recycled asphalt concrete comprises recycled aggregate, new aggregate, modified asphalt and mineral powder, and the modified asphalt comprises the following components in percentage by mass: 0.5-1 of asphalt and a reinforcing agent; the enhancer consists of viscoelastic body anticorrosive paste, an anti-stripping agent, steel slag powder and fly ash. According to the invention, the asphalt is modified, so that the problems of low bonding strength between the asphalt and the aggregate and poor water stability in the recycled asphalt concrete are solved, and the overall structural strength of the asphalt concrete is improved.
Description
Technical Field
The invention belongs to the technical field of asphalt concrete, and particularly relates to recycled asphalt concrete and application thereof.
Background
The asphalt concrete is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregate with a certain gradation composition, broken stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregate, the broken stone or crushed gravel, the stone chips or sand, the mineral powder and a certain proportion of road asphalt material under strictly controlled conditions.
CN110002796A discloses a recycled asphalt concrete, which comprises the following components in parts by weight: 72-80 parts of new aggregate; 4-6 parts of SBS modified asphalt; 0.2-0.4 part of mineral powder; 20-24 parts of a regenerated asphalt mixed old material; 0.12-0.16 part of a regenerant; 6-8 parts of steel slag; 2.4-4.6 parts of sintered metal powder porous material; CI 18140.08-0.14 parts of an asphalt defoamer; 4-8 parts of a fiber filler; 3-7 parts of reinforcing filler. When the recycled asphalt concrete is applied to road construction, the recycled asphalt concrete has good bonding strength with old asphalt concrete, and cracks are not easy to generate in the using process, so that the whole road has good service life.
CN11366668A discloses a recycled asphalt concrete, which comprises the following substances in parts by weight: 3-10 parts of mineral powder, 1-5 parts of fly ash, 35-150 parts of recycled coarse aggregate, 45-150 parts of recycled fine aggregate and 10-30 parts of modified recycled asphalt; the recycled coarse aggregate comprises a recycled coarse aggregate matrix and an aerogel coating film. The preparation method of the recycled asphalt concrete comprises the following preparation steps: s1, pre-mixing; s2, melting asphalt; and S3, mixing and stirring. The invention carries out coating treatment on the recycled coarse aggregate, improves the surface structure of the recycled coarse aggregate through the coating treatment, and improves the mechanical strength and the mechanical property of the recycled coarse aggregate material, so that after the recycled coarse aggregate material is added into recycled asphalt concrete, a good loading filling effect can be formed, and the service life of the recycled asphalt concrete material is further optimized.
The regeneration of old asphalt materials is widely applied to road construction at present, greatly saves asphalt and gravel materials, reduces engineering investment, and is beneficial to waste disposal, energy conservation and environmental protection.
However, in practice, the waste asphalt is partially aged, the bonding strength between the asphalt and the aggregate is weakened, and when water is encountered, the water flows into the inner space of the asphalt concrete, so that the bonding strength between the asphalt and the aggregate is further reduced, the overall structural strength of the asphalt concrete is reduced, and water damage is easily caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a recycled asphalt concrete and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a recycled asphalt concrete comprises recycled aggregate, new aggregate, modified asphalt and mineral powder.
Preferably, the modified asphalt comprises the following components in a mass ratio of 5: 0.5-1 of asphalt and a reinforcing agent.
Preferably, the enhancer consists of viscoelastic body anticorrosion paste, an anti-stripping agent, steel slag powder and fly ash.
Preferably, the anti-stripping agent is a non-amine anti-stripping agent.
Preferably, the enhancer consists of the following components in parts by weight: 10-20 parts of viscoelastic body anticorrosive paste, 5-10 parts of anti-stripping agent, 10-20 parts of steel slag powder and 50-60 parts of fly ash.
Further preferably, the mass ratio of the viscoelastic body anticorrosive paste to the anti-stripping agent to the steel slag powder to the fly ash in the enhancer is 15: 6: 15: 55.
preferably, the preparation method of the modified asphalt comprises the following steps:
(1) melting and dehydrating the asphalt with the formula amount to obtain asphalt liquid;
(2) adding the enhancer in the formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain the modified asphalt.
Further preferably, the temperature for the dehydration of the asphalt in the step (1) is 110-130 ℃.
Further preferably, the water content of the asphalt liquid in the step (1) is 3-8 per mill.
Further preferably, the temperature of the modified asphalt in the step (2) is 150-170 ℃.
Preferably, the recycled aggregate is obtained by turning over, digging out, recycling, transporting, crushing and screening the old, crushed and aged asphalt pavement.
Preferably, the recycled aggregate has a particle size of less than 10 mm.
Preferably, the particle size grading of the recycled aggregate is 0.05-2.5mm, 2.5-5mm and 5-10 mm.
Preferably, the particle size of the virgin aggregate is less than 19 mm.
Preferably, the mineral powder is limestone powder with the particle size of less than 0.075 mm.
Preferably, the recycled asphalt concrete comprises the following components in parts by weight: 14-20 parts of recycled aggregate, 10-16 parts of new aggregate, 1-3 parts of modified asphalt and 5-8 parts of mineral powder.
The invention also provides a preparation method of the recycled asphalt concrete, which comprises the following steps:
s1, mixing the recycled aggregate, the new aggregate and the mineral powder according to the formula ratio to obtain a mixture;
and S2, adding the mixture obtained in the step S1 into modified asphalt, and mixing to obtain the recycled asphalt concrete.
The invention also provides application of the recycled asphalt concrete in road construction or water conservancy construction.
The invention has the beneficial effects that:
(1) the invention solves the problems of low bonding strength between asphalt and aggregate and poor water stability in the recycled asphalt concrete, and improves the overall structural strength of the asphalt concrete.
(2) The enhancer of the invention consists of viscoelastic body anti-corrosion paste, anti-stripping agent, steel slag powder and fly ash, and the mechanical property of asphalt concrete can be improved while the stripping performance of asphalt and acid aggregate is improved by adding the steel slag powder and the fly ash. The viscoelastic body anticorrosive paste material is a novel special adhesive material, the chemical structure of the viscoelastic body anticorrosive paste material is a typical saturated linear polymer, the viscoelastic body anticorrosive paste material does not contain double bonds, the viscoelastic body anticorrosive paste material is called as a never-cured polymer, and the viscoelastic body anticorrosive paste material has good chemical corrosion resistance, the inventor surprisingly discovers that the addition of the viscoelastic body anticorrosive paste can obviously improve the water stability of asphalt concrete, and when the mass ratio of the viscoelastic body anticorrosive paste to the anti-stripping agent to the steel slag powder to the fly ash is 15: 6: 15: the effect is better at 55 days.
Detailed Description
The following description of the embodiments of the present invention is provided in conjunction with specific embodiments, and other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
The sources of the raw materials adopted by the invention are not limited, and if not specially stated, the raw materials adopted by the invention are all common commercial products in the technical field, wherein the viscoelastic body antiseptic paste is purchased from Changtong new materials, Inc., the anti-stripping agent is a non-amine compound, is purchased from constant water lubricating oil, Inc., the product number is LY asphalt anti-stripping agent, and the new aggregate is 2.65-2.78g/cm apparent density 3 The water absorption rate is 0.98%, the adhesiveness with asphalt is 5 grade, the asphalt is No. 70 special asphalt for hydraulic engineering, the mineral powder is limestone powder with the particle size of less than 0.075mm, and the asphalt mixing equipment adopts a DHB40 type asphalt concrete mixing station.
A recycled asphalt concrete comprises recycled aggregate, new aggregate, modified asphalt and mineral powder.
Preferably, the modified asphalt comprises the following components in a mass ratio of 5: 0.5-1 of asphalt and a reinforcing agent.
Preferably, the enhancer consists of viscoelastic body anticorrosion paste, an anti-stripping agent, steel slag powder and fly ash.
Preferably, the anti-stripping agent is a non-amine anti-stripping agent.
Preferably, the enhancer consists of the following components in parts by weight: 10-20 parts of viscoelastic body anticorrosive paste, 5-10 parts of anti-stripping agent, 10-20 parts of steel slag powder and 50-60 parts of fly ash.
Further preferably, the mass ratio of the viscoelastic body anticorrosive paste, the anti-stripping agent, the steel slag powder and the fly ash in the enhancer is 15: 6: 15: 55.
preferably, the preparation method of the modified asphalt comprises the following steps:
(1) melting and dehydrating the asphalt with the formula amount to obtain asphalt liquid;
(2) adding the enhancer in the formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain the modified asphalt.
Further preferably, the temperature for the asphalt dehydration in the step (1) is 110-130 ℃.
Further preferably, the water content of the asphalt liquid in the step (1) is 3-8 per mill.
Further preferably, the temperature of the modified asphalt in the step (2) is 150-170 ℃.
Preferably, the recycled aggregate is obtained by turning over, digging out, recycling, transporting, crushing and screening the old, crushed and aged asphalt pavement.
Preferably, the recycled aggregate has a particle size of less than 10 mm.
Preferably, the particle size grading of the recycled aggregate is 0.05-2.5mm, 2.5-5mm and 5-10 mm.
Preferably, the particle size of the virgin aggregate is less than 19 mm.
Preferably, the mineral powder is limestone powder with the particle size of less than 0.075 mm.
Preferably, the recycled asphalt concrete comprises the following components in parts by weight: 14-20 parts of recycled aggregate, 10-16 parts of new aggregate, 1-3 parts of modified asphalt and 5-8 parts of mineral powder.
The invention also provides a preparation method of the recycled asphalt concrete, which comprises the following steps:
s1, mixing the recycled aggregate, the new aggregate and the mineral powder according to the formula ratio to obtain a mixture;
and S2, adding the mixture obtained in the step S1 into modified asphalt, and mixing to obtain the recycled asphalt concrete.
Example 1 recycled asphalt concrete and preparation method thereof
The recycled asphalt concrete comprises the following components in parts by weight: 14 parts of recycled aggregate, 16 parts of new aggregate, 1 part of modified asphalt and 8 parts of mineral powder;
wherein the modified asphalt comprises the following components in percentage by mass: 1, the reinforcing agent consists of the following components in parts by weight: 20 parts of viscoelastic body anticorrosive paste, 10 parts of anti-stripping agent, 20 parts of steel slag powder and 50 parts of fly ash;
specifically, the preparation method of the modified asphalt comprises the following steps:
(1) melting the asphalt with the formula ratio, and dehydrating at the temperature of 110-130 ℃ to obtain asphalt liquid with the water content of 5 per mill;
(2) adding the enhancer in the formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain the modified asphalt with the temperature of 150 ℃ and 170 ℃.
The preparation method of the recycled asphalt concrete comprises the following steps:
s1, mixing the recycled aggregate, the new aggregate and the mineral powder according to the formula ratio to obtain a mixture;
and S2, adding the mixture obtained in the step S1 into modified asphalt, and mixing for 50S to obtain the recycled asphalt concrete.
Example 2 recycled asphalt concrete and preparation method thereof
The recycled asphalt concrete comprises the following components in parts by weight: 16 parts of recycled aggregate, 14 parts of new aggregate, 2 parts of modified asphalt and 6 parts of mineral powder;
wherein the modified asphalt comprises the following components in percentage by mass: 0.7 of asphalt and a reinforcing agent, wherein the reinforcing agent consists of the following components in parts by weight: 15 parts of viscoelastic body anticorrosive paste, 6 parts of anti-stripping agent, 15 parts of steel slag powder and 55 parts of fly ash;
specifically, the preparation method of the modified asphalt comprises the following steps:
(1) melting the asphalt according to the formula amount, and dehydrating at the temperature of 110-130 ℃ to obtain asphalt liquid with the water content of 3 per mill;
(2) adding the enhancer with the formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain the modified asphalt with the temperature of 150-170 ℃.
The preparation method of the recycled asphalt concrete is the same as that of example 1.
Example 3 recycled asphalt concrete and preparation method thereof
The recycled asphalt concrete comprises the following components in parts by weight: 18 parts of recycled aggregate, 12 parts of new aggregate, 2 parts of modified asphalt and 7 parts of mineral powder;
wherein the modified asphalt comprises the following components in percentage by mass: 0.8 of asphalt and a reinforcing agent, wherein the reinforcing agent consists of the following components in parts by weight: 15 parts of viscoelastic body anticorrosive paste, 6 parts of anti-stripping agent, 15 parts of steel slag powder and 55 parts of fly ash
Specifically, the preparation method of the modified asphalt comprises the following steps:
(1) melting the asphalt with the formula ratio, and dehydrating at the temperature of 110-130 ℃ to obtain asphalt liquid with the water content of 7 per mill;
(2) adding the enhancer in the formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain the modified asphalt with the temperature of 150 ℃ and 170 ℃.
The preparation method of the recycled asphalt concrete is the same as that of example 1.
Example 4 recycled asphalt concrete and preparation method thereof
The recycled asphalt concrete comprises the following components in parts by weight: 20 parts of recycled aggregate, 10 parts of new aggregate, 3 parts of modified asphalt and 5 parts of mineral powder;
wherein the modified asphalt comprises the following components in percentage by mass: 0.5 of asphalt and a reinforcing agent, wherein the reinforcing agent consists of the following components in parts by weight: 10 parts of viscoelastic body anticorrosive paste, 5 parts of anti-stripping agent, 10 parts of steel slag powder and 60 parts of fly ash;
specifically, the preparation method of the modified asphalt comprises the following steps:
(1) melting the asphalt with the formula ratio, and dehydrating at the temperature of 110-130 ℃ to obtain asphalt liquid with the water content of 7 per mill;
(2) adding the enhancer in the formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain the modified asphalt with the temperature of 150 ℃ and 170 ℃.
The preparation method of the recycled asphalt concrete is the same as that of example 1.
Comparative example 1 recycled asphalt concrete and preparation method thereof
The comparative example is different from example 2 in that the reinforcing agent consists of the following components in parts by weight: 12 parts of anti-stripping agent, 15 parts of steel slag powder and 55 parts of fly ash.
Comparative example 2 recycled asphalt concrete and preparation method thereof
The comparative example is different from example 2 in that the reinforcing agent consists of the following components in parts by weight: 25 parts of viscoelastic body anticorrosive paste, 3 parts of anti-stripping agent, 25 parts of steel slag powder and 45 parts of fly ash.
Comparative example 3 recycled asphalt concrete and preparation method thereof
The comparative example is different from example 2 in that the reinforcing agent consists of the following components in parts by weight: 8 parts of viscoelastic body anticorrosive paste, 12 parts of anti-stripping agent, 10 parts of steel slag powder and 50 parts of fly ash.
1. Cleavage Strength evaluation
The recycled asphalt concretes of examples and comparative examples were fabricated into cylindrical test pieces of Φ 10cm × 6cm, and the split tensile strengths thereof were measured, and the results are shown in table 1.
TABLE 1
| Group of | Tensile strength at cleavage/MPa |
| Example 1 | 0.80 |
| Example 2 | 0.92 |
| Example 3 | 0.90 |
| Example 4 | 0.85 |
| Comparative example 1 | 0.48 |
| Comparative example 2 | 0.52 |
| Comparative example 3 | 0.58 |
2. Evaluation of Water stability
The water stability test needs to prepare test pieces with the diameter and height of 100 +/-2 mm, 1 group of test pieces are soaked in water at 80 ℃ for 48h, the other 1 group of test pieces are kept at the constant temperature in air at 20 ℃ for 48h, and 2 groups of test pieces are subjected to a uniaxial compressive strength test, wherein the ratio of the two is a water stability coefficient, and the coefficient is greater than 0.9, so that the water stability test meets the standard requirement. The results are shown in Table 2.
TABLE 2
| Compressive strength in air/MPa | Compressive strength/MPa after immersion | Coefficient of water stability | |
| Example 1 | 1.83 | 1.66 | 0.91 |
| Example 2 | 1.98 | 1.84 | 0.93 |
| Example 3 | 1.94 | 1.82 | 0.94 |
| Example 4 | 1.88 | 1.72 | 0.91 |
| Comparative example 1 | 1.74 | 1.52 | 0.87 |
| Comparative example 2 | 1.64 | 1.45 | 0.88 |
| Comparative example 3 | 1.78 | 1.59 | 0.89 |
As can be seen from the above table, the recycled asphalt concrete of the invention has good water stability, and the coefficient of water stability is more than 0.9 when the recycled asphalt concrete is soaked in water at 80 ℃ for 48 hours. In contrast to comparative examples 1-3, when the amount of the enhancer is changed and is not within the protection range of the present invention, the air compressive strength is slightly reduced, but the strength loss is large after the high temperature soaking, the water stability coefficient is less than 0.9, and the water stability is poor.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (7)
1. The recycled asphalt concrete is characterized by comprising recycled aggregate, new aggregate, modified asphalt and mineral powder, wherein the modified asphalt comprises the following components in percentage by mass: 0.5-1 of asphalt and a reinforcing agent; the enhancer comprises the following components in parts by weight: 10-20 parts of viscoelastic body anticorrosive paste, 5-10 parts of anti-stripping agent, 10-20 parts of steel slag powder and 50-60 parts of fly ash;
the preparation method of the modified asphalt comprises the following steps:
(1) melting and dehydrating the asphalt with the formula amount to obtain asphalt liquid;
(2) adding a reinforcer in a formula amount into the asphalt liquid obtained in the step (1) in several times, and uniformly mixing to obtain modified asphalt;
in the step (1), the temperature for asphalt dehydration is 110-130 ℃, and the water content of the asphalt liquid is 3-8 per mill.
2. The recycled asphalt concrete according to claim 1, wherein the reinforcing agent comprises a viscoelastic body anticorrosive paste, an anti-stripping agent, steel slag powder and fly ash in a mass ratio of 15: 6: 15: 55.
3. the recycled asphalt concrete according to claim 1, wherein the recycled aggregate is obtained by turning over, digging out, recycling, transporting, crushing and screening old, crushed and aged asphalt pavement; the particle size of the recycled aggregate is less than 10 mm.
4. The recycled asphalt concrete according to claim 1, wherein the particle size of the virgin aggregate is less than 19 mm; the mineral powder is limestone powder with the particle size of less than 0.075 mm.
5. The recycled asphalt concrete according to claim 1, wherein the recycled asphalt concrete comprises the following components in parts by weight: 14-20 parts of recycled aggregate, 10-16 parts of new aggregate, 1-3 parts of modified asphalt and 5-8 parts of mineral powder.
6. The method for preparing recycled asphalt concrete according to any one of claims 1 to 5, comprising the steps of:
s1, mixing the recycled aggregate, the new aggregate and the mineral powder according to the formula ratio to obtain a mixture;
and S2, adding the mixture obtained in the step S1 into modified asphalt, and mixing to obtain the recycled asphalt concrete.
7. Use of the recycled asphalt concrete according to any one of claims 1 to 5 in road construction or water conservancy construction.
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| WO2011027926A1 (en) * | 2009-09-07 | 2011-03-10 | Huh Jung Do | Temperature-adjusted and modified recycled ascon composition for reusing 100% of waste ascon for road pavement, and method for manufacturing same |
| CA2902935A1 (en) * | 2015-10-01 | 2017-04-01 | Jung Do Huh | Novel highly viscoelastic warm-mix modifier composition and their manufacturing method thereof; and compositions of virgin and recycles modified warm-mix asphalt concrete mixturesand their manufacturing method thereof |
| CN108373283B (en) * | 2018-02-01 | 2020-01-14 | 武汉理工大学 | Asphalt mixture anti-stripping agent prepared from steel slag tailings and preparation and use methods thereof |
| CN108409205A (en) * | 2018-03-28 | 2018-08-17 | 平顶山市公路交通勘察设计院 | A kind of steel slag coal ash AC-16 asphalts |
| CN109678397B (en) * | 2019-01-19 | 2021-02-12 | 江苏盛达飞建筑材料有限公司 | Regenerated asphalt mixture and preparation method thereof |
| CN112408864B (en) * | 2020-11-24 | 2022-08-05 | 北京路德永泰环保科技有限公司 | Regenerated asphalt mixture and preparation method thereof |
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