CN112179793A - Multi-scale self-repairing and effect evaluation method for epoxy emulsified asphalt cold-recycling mixture - Google Patents
Multi-scale self-repairing and effect evaluation method for epoxy emulsified asphalt cold-recycling mixture Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 144
- 239000000203 mixture Substances 0.000 title claims abstract description 67
- 239000004593 Epoxy Substances 0.000 title claims abstract description 43
- 238000004064 recycling Methods 0.000 title claims abstract description 37
- 230000000694 effects Effects 0.000 title claims abstract description 18
- 238000011156 evaluation Methods 0.000 title claims abstract description 10
- 239000003094 microcapsule Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000003822 epoxy resin Substances 0.000 claims abstract description 16
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 14
- 239000000084 colloidal system Substances 0.000 claims description 14
- 230000002929 anti-fatigue Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 9
- 239000003995 emulsifying agent Substances 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 6
- 239000001110 calcium chloride Substances 0.000 claims description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 6
- 125000002091 cationic group Chemical group 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000000839 emulsion Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 239000012153 distilled water Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0218—Calculations based on experimental data
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/067—Parameter measured for estimating the property
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Abstract
The invention discloses a multi-scale self-repairing and evaluating method for an epoxy emulsified asphalt cold-recycling mixture, belongs to the technical field of preparation of aqueous epoxy emulsified asphalt cold-recycling mixtures, and solves the problems of poor crack resistance, poor self-repairing effect, single evaluation index of the self-repairing effect, short service life of aqueous epoxy emulsified asphalt cold-recycling pavements and the like of aqueous epoxy emulsified asphalt cold-recycling mixtures. Firstly, preparing a microcapsule A/water-based epoxy resin mixed solution and a water-based epoxy curing agent/microcapsule B/emulsified asphalt mixed solution; then, mechanically stirring the two mixed solutions to prepare the water-based epoxy resin modified emulsified asphalt doped with the microcapsule A, B, and calculating an asphalt repair index; and finally, preparing the epoxy emulsified asphalt cold recycled material containing the microcapsules A, B, C, calculating the asphalt mixture repair index, and determining the optimal mixing ratio of the three microcapsules. The invention improves the durability of the cold-recycling asphalt pavement and promotes the further development of the cold-recycling technology of the asphalt pavement.
Description
Technical Field
The invention discloses a multiscale self-repairing and effect evaluation method for an epoxy emulsified asphalt cold-recycling mixture, and belongs to the technical field of preparation of aqueous epoxy emulsified asphalt cold-recycling mixtures.
Background
The cracking of asphalt pavement is closely related to the properties of asphalt, the composition of asphalt mixture, the thickness of asphalt film, traffic volume, climate and other factors. Research shows that the toughness and the cohesive force of old asphalt on the surface of the recycled asphalt mixture are insufficient, so that the recycled asphalt mixture has poor crack resistance under the low-temperature condition, the service life of the recycled asphalt pavement is greatly shortened, and the phenomenon is more obvious for the cold recycled asphalt mixture with the original weak comprehensive performance. Therefore, solving the problem of asphalt pavement cracking is of great importance to the popularization of asphalt pavement green construction and green maintenance technology.
In order to inhibit the generation of crack diseases of asphalt pavements and prolong the service life of pavements, the self-repairing property of asphalt materials is gradually concerned, but the self-repairing capability of asphalt is very limited, and the self-repairing capability needs to be improved by means of a passive enhancement technology, and common methods include an electromagnetic induction heating method, a microwave heating method, a photorepair method and a microcapsule method. The microcapsule method can successfully avoid the influence of aging on the internal structure of the asphalt pavement, so the microcapsule method is often considered as an effective method capable of improving the self-repairing capability of the asphalt mixture.
However, the current microcapsule process is commonly used in fresh mix asphalt mixes and only one self-repair is achieved. The microcapsules are usually incorporated into the asphalt mixture by wet or dry mixing, i.e., the microcapsules are incorporated into the asphalt and then the asphalt mixture is prepared, or the microcapsules are directly incorporated into the mixture in the form of fine aggregates. However, a large number of research and tracking observation results show that the self-repairing effect of the two mixing modes after being used independently is not ideal, and a unified method for evaluating the self-repairing performance of the asphalt and the asphalt mixture does not exist at present. In addition, with the rapid development of traffic industry and the continuous improvement of living demands of people, factors influencing the cracking of the asphalt pavement are more and more, and a simple one-time self-repairing mode cannot meet the requirement.
In the water-based epoxy emulsified asphalt cold recycling mixture, the addition of the water-based epoxy resin obviously improves the strength of the cold recycling material, but simultaneously brings great challenges to the anti-cracking capability of the cold recycling material. In view of the above, in order to enable the water-based epoxy emulsified asphalt cold-recycling mixture to have high strength and good self-repairing performance, the invention provides a multi-scale self-repairing and evaluating method for the water-based epoxy emulsified asphalt cold-recycling mixture, wherein microcapsules with grain diameters of less than 50 μm (microcapsule A), 50-200 μm (microcapsule B) and 1-5mm (microcapsule C) in three-level gradient are doped into the water-based epoxy emulsified asphalt cold-recycling mixture, and three-level self-repairing is realized through the microcapsules with three grain diameters, so that the generation of asphalt pavement microcracks, microcracks and macroscopic cracks is inhibited. In addition, the invention also provides two self-repairing indexes to evaluate the self-repairing effect of the asphalt and the asphalt mixture, so as to determine the optimal mixing ratio of the three microcapsules, improve the crack resistance of the water-based epoxy emulsified asphalt cold-recycling mixture and prolong the service life of the water-based epoxy emulsified asphalt cold-recycling pavement.
Disclosure of Invention
(1) Technical problem
The invention aims to provide a multi-scale self-repairing and effect evaluating method for an epoxy emulsified asphalt cold-recycling mixture, which respectively inhibits the internal damage of an asphalt pavement or the generation of microcracks, microcracks and macrocracks through the micro, microscopic and macroscopic multi-scale self-repairing functions, thereby solving the problems of insufficient crack resistance, poor single-scale self-repairing effect, single self-repairing effect evaluation index, short service life of the aqueous epoxy emulsified asphalt cold-recycling pavement and the like of the aqueous epoxy emulsified asphalt cold-recycling mixture.
(2) Technical scheme
The method aims to solve the problems that the cracking resistance of the water-based epoxy emulsified asphalt cold-recycling mixture is insufficient, the single-scale self-repairing effect is poor, the evaluation index of the self-repairing effect is single, the service life of the water-based epoxy emulsified asphalt cold-recycling pavement is short, and the like. The invention provides a multiscale self-repairing and effect evaluation method for an epoxy emulsified asphalt cold-recycling mixture. The invention mixes the microcapsules with the grain size ranges of less than 50 mu m, 50-200 mu m and 1-5mm three-level grain size gradient into the water-based epoxy emulsified asphalt cold-recycling mixture, and the microcapsules are correspondingly named as microcapsule A, microcapsule B and microcapsule C respectively, and the multi-scale self-repairing is realized through the microcapsules with the three grain sizes, thereby effectively inhibiting the internal damage of the asphalt pavement or the generation of micro cracks, micro cracks and macroscopic cracks. The scheme of the invention is as follows: firstly, uniformly stirring a microcapsule A and a water-based epoxy resin emulsion to prepare a microcapsule A/water-based epoxy resin mixed solution, and simultaneously uniformly stirring a water-based epoxy curing agent, a microcapsule B and emulsified asphalt to prepare a water-based epoxy curing agent/microcapsule B/emulsified asphalt mixed solution; then mechanically stirring the two mixed solutions at normal temperature to prepare aqueous epoxy resin modified emulsified asphalt containing microcapsules A and B, and performing test detection according to the technical requirements of various indexes of the modified emulsified asphalt in technical Specification for road asphalt pavement construction (JTG F40-2004) such as storage stability, oversize residue and evaporation residue; further measuring an anti-fatigue factor according to an asphalt dynamic shear rheological test in road engineering asphalt and asphalt mixture test procedure (JTG E20-2011), calculating an asphalt repair index, evaluating the self-repairing performance of the aqueous epoxy emulsified asphalt, observing an asphalt fracture interface microstructure by virtue of an environmental scanning electron microscope test, and evaluating the cracking effectiveness of the microcapsule; and finally, equivalently replacing fine aggregates with microcapsules C to prepare the water-based epoxy emulsified asphalt cold-recycling mixture containing three-level gradient microcapsules A, B, C, measuring bending strain according to a low-temperature bending test of the asphalt mixture in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), calculating a repair index of the asphalt mixture, researching the self-repairing performance difference of the water-based epoxy emulsified asphalt cold-recycling mixture under the conditions that the total mixing amount of the microcapsules is certain, and the three capsules with different particle sizes have different mixing ratios, and further determining the optimal mixing ratio of the three microcapsules with different particle sizes.
(3) Advantageous effects
The cold recycling technology of the asphalt pavement can improve the grade of the road, keep the clear height of the road, reconstruct the outline of the road, reduce the construction cost, recycle the existing materials, save resources and protect the environment. As an important measure for realizing a cold regeneration technology, the water-based epoxy emulsified asphalt cold regeneration mixture has the defects of poor low-temperature crack resistance and lack of self-repairing performance, so that the service life of a cold-regenerated asphalt pavement is greatly shortened. At present, a microcapsule method is an effective method capable of improving self-repairing capability of asphalt and asphalt mixtures, but generally only one-time self-repairing can be realized, and a unified method for evaluating the self-repairing performance of the asphalt and the asphalt mixtures is not available. Therefore, the invention provides a multi-scale self-repairing and evaluating method for an epoxy emulsified asphalt cold recycling material, which inhibits the internal damage or the generation of microcracks-macrocracks on an asphalt pavement through the multi-scale self-repairing function, thereby solving the problems of insufficient crack resistance, poor self-repairing effect, single evaluation index of the self-repairing effect, short service life of the water-based epoxy emulsified asphalt cold recycling material and the like, and providing theoretical support and technical reference for the application and popularization of an asphalt pavement cold recycling technology.
Detailed Description
The invention provides a multiscale self-repairing and effect evaluation method for an epoxy emulsified asphalt cold-recycling mixture, which comprises the following specific implementation steps of:
(1) weighing distilled water required by the test, heating to 80 ℃, adding polyvinyl alcohol and calcium chloride particles accounting for 0.15% of the water by mass, uniformly stirring for 15min by hand to fully dissolve the polyvinyl alcohol and the calcium chloride particles, adding a cationic emulsifier accounting for 1.5% of the water by mass, and stirring for 10min by hand to fully mix the cationic emulsifier and the calcium chloride particles uniformly to prepare an emulsifier aqueous solution;
(2) weighing 90 parts of the required amount for test#Putting the matrix asphalt into a constant-temperature oven at 150 ℃, operating a colloid mill, pouring hot water at 80 ℃ into the colloid mill, preheating for 15s, opening a liquid outlet of the colloid mill, discharging the hot water, and closing the liquid outlet of the colloid mill;
(3) pouring 60 deg.C emulsifier water solution into colloid mill, slowly pouring 90 deg.C preheated water solution into colloid mill after 20s#Circularly grinding the base asphalt for 1min to prepare dark brown common emulsified asphalt, placing the emulsified asphalt into a beaker from a liquid outlet, and closing a colloid mill;
(4) uniformly and manually stirring the microcapsule A and the cationic water-based epoxy resin emulsion for 3min at the temperature of 50 ℃ to prepare a microcapsule A/water-based epoxy resin mixed solution, standing for 15min for later use, sequentially adding a certain calculated amount of water-based epoxy curing agent and a microcapsule B into common emulsified asphalt at the temperature of 50 ℃, uniformly and manually stirring for 5min to prepare a water-based epoxy curing agent/microcapsule B/emulsified asphalt mixed solution, and standing for 15min for later use;
(5) mixing the two mixed solutions prepared in the step (4) according to a certain proportion at the normal temperature at the temperature of 25 ℃, mechanically stirring for 10min at the rotating speed of 300rpm to prepare the water-based epoxy resin modified emulsified asphalt doped with the microcapsule A, B, and then manually and uniformly stirring for 5min to further promote the uniform dispersion of the microcapsule A, B and the water-based epoxy resin in the emulsified asphalt;
(6) detecting according to technical requirements of various indexes of storage stability, screen residue and evaporation residues of modified emulsified asphalt in technical Specification for road asphalt pavement construction (JTG F40-2004), measuring an anti-fatigue factor according to an asphalt dynamic shear rheological test in road engineering asphalt and asphalt mixture test procedure (JTG E20-2011), calculating an asphalt repair index according to a formula I, evaluating self-repairing performance of the waterborne epoxy emulsified asphalt, observing a microstructure of an asphalt fracture interface by adopting an environmental scanning electron microscope test, and evaluating a distribution state of microcapsules A, B and tearing repair effectiveness;
asphalt repair index ═ antifatigue factor(maintenance sample)Anti-fatigue factor(initial sample)Formula (I)
In the formula:
anti-fatigue factor(maintenance sample)-fatigue resistance factor of the asphalt sample after standing for 1h at 25 ℃ when the complex shear modulus of the asphalt is reduced by 30%;
anti-fatigue factor(initial sample)-the fatigue factor of the asphalt sample to be tested;
(7) at 25 ℃, pouring the prepared old asphalt mixture into a mixing pot in sequence, mixing for 15s, pouring a uniform mixture of new aggregate and microcapsules C, mixing for 30s, wherein the microcapsules C are calculated by replacing fine aggregates with equivalent particle size, pouring the prepared waterborne epoxy resin modified emulsified asphalt doped with the microcapsules A, B, mixing for 45s, adding a certain amount of mineral powder, and mixing for 15s to prepare a waterborne epoxy emulsified asphalt cold-recycling mixture containing the microcapsules A, B, C;
(8) according to an asphalt mixture bending test in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), calculating an asphalt mixture repair index according to a formula II, researching that the total mixing amount of microcapsules is certain, and analyzing the self-repair performance result of the water-based epoxy emulsified asphalt cold-recycling mixture under the conditions of different mixing ratios of the three microcapsules to further determine the optimal mixing ratio of the three microcapsules.
Asphalt mixture repair index ═ bending tensile strain(maintenance sample)Bending tensile strain(initial sample)Formula 2
In the formula:
bending strain(maintenance sample)-the bending tensile strain of the bituminous mixture sample after standing for 24 hours at 25 ℃ when the stiffness modulus of the bituminous mixture is reduced by 30%;
bending strain(initial sample)The flexural tensile strain of the bituminous mixture sample to be tested.
Claims (1)
1. The method for multi-scale self-repairing and effect evaluation of the epoxy emulsified asphalt cold-recycling mixture is characterized by comprising the following specific steps of:
(1) weighing distilled water required by the test, heating to 80 ℃, adding polyvinyl alcohol and calcium chloride particles accounting for 0.15% of the water by mass, uniformly stirring for 15min by hand to fully dissolve the polyvinyl alcohol and the calcium chloride particles, adding a cationic emulsifier accounting for 1.5% of the water by mass, and stirring for 10min by hand to fully mix the cationic emulsifier and the calcium chloride particles uniformly to prepare an emulsifier aqueous solution;
(2) weighing 90 parts of the required amount for test#Putting the matrix asphalt into a constant-temperature oven at 150 ℃, operating a colloid mill, pouring hot water at 80 ℃ into the colloid mill, preheating for 15s, opening a liquid outlet of the colloid mill, discharging the hot water, and closing the liquid outlet of the colloid mill;
(3) pouring 60 deg.C emulsifier water solution into colloid mill, slowly pouring 90 deg.C preheated water solution into colloid mill after 20s#Circularly grinding the base asphalt for 1min to prepare dark brown common emulsified asphalt, placing the emulsified asphalt into a beaker from a liquid outlet, and closing a colloid mill;
(4) uniformly and manually stirring the microcapsule A and the cationic water-based epoxy resin emulsion for 3min at the temperature of 50 ℃ to prepare a microcapsule A/water-based epoxy resin mixed solution, standing for 15min for later use, sequentially adding a certain calculated amount of water-based epoxy curing agent and a microcapsule B into common emulsified asphalt at the temperature of 50 ℃, uniformly and manually stirring for 5min to prepare a water-based epoxy curing agent/microcapsule B/emulsified asphalt mixed solution, and standing for 15min for later use;
(5) mixing the two mixed solutions prepared in the step (4) according to a certain proportion at the normal temperature at the temperature of 25 ℃, mechanically stirring for 10min at the rotating speed of 300rpm to prepare the water-based epoxy resin modified emulsified asphalt doped with the microcapsule A, B, and then manually and uniformly stirring for 5min to further promote the uniform dispersion of the microcapsule A, B and the water-based epoxy resin in the emulsified asphalt;
(6) detecting according to technical requirements of various indexes of storage stability, screen residue and evaporation residues of modified emulsified asphalt in technical Specification for road asphalt pavement construction (JTG F40-2004), measuring an anti-fatigue factor according to an asphalt dynamic shear rheological test in road engineering asphalt and asphalt mixture test procedure (JTG E20-2011), calculating an asphalt repair index according to a formula I, evaluating self-repairing performance of the waterborne epoxy emulsified asphalt, observing a microstructure of an asphalt fracture interface by adopting an environmental scanning electron microscope test, and evaluating a distribution state of microcapsules A, B and tearing repair effectiveness;
asphalt repair index ═ antifatigue factor(maintenance sample)Anti-fatigue factor(initial sample)Formula (I)
In the formula:
anti-fatigue factor(maintenance sample)-fatigue resistance factor of the asphalt sample after standing for 1h at 25 ℃ when the complex shear modulus of the asphalt is reduced by 30%;
anti-fatigue factor(initial sample)-the fatigue factor of the asphalt sample to be tested;
(7) at 25 ℃, pouring the prepared old asphalt mixture into a mixing pot in sequence, mixing for 15s, pouring a uniform mixture of new aggregate and microcapsules C, mixing for 30s, wherein the microcapsules C are calculated by replacing fine aggregates with equivalent particle size, pouring the prepared waterborne epoxy resin modified emulsified asphalt doped with the microcapsules A, B, mixing for 45s, adding a certain amount of mineral powder, and mixing for 15s to prepare a waterborne epoxy emulsified asphalt cold-recycling mixture containing the microcapsules A, B, C;
(8) according to an asphalt mixture bending test in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), calculating an asphalt mixture repair index according to a formula II, researching that the total mixing amount of microcapsules is certain, and analyzing the self-repair performance result of the water-based epoxy emulsified asphalt cold-recycling mixture under the conditions of different mixing ratios of the three microcapsules to further determine the optimal mixing ratio of the three microcapsules.
Asphalt mixture repair index ═ bending tensile strain(maintenance sample)Bending tensile strain(initial sample)Formula 2
In the formula:
bending strain(maintenance sample)-the bending tensile strain of the bituminous mixture sample after standing for 24 hours at 25 ℃ when the stiffness modulus of the bituminous mixture is reduced by 30%;
bending strain(initial sample)The flexural tensile strain of the bituminous mixture sample to be tested.
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| CN113834708A (en) * | 2021-09-15 | 2021-12-24 | 南京林业大学 | Sample preparation method for emulsified asphalt and old asphalt fusion test |
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| CN115233514A (en) * | 2022-08-02 | 2022-10-25 | 周伟 | Self-healing pavement structure and preparation method thereof |
| CN116678769A (en) * | 2023-07-27 | 2023-09-01 | 北京工业大学 | Method, device, terminal and storage medium for determining asphalt pavement repair time |
| CN116678769B (en) * | 2023-07-27 | 2023-10-31 | 北京工业大学 | Method for determining repair time of asphalt pavement |
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