CN113620656A - Preparation method of cold-mix fully-recycled asphalt mixture based on solvent-based liquid asphalt - Google Patents
Preparation method of cold-mix fully-recycled asphalt mixture based on solvent-based liquid asphalt Download PDFInfo
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- CN113620656A CN113620656A CN202111050626.XA CN202111050626A CN113620656A CN 113620656 A CN113620656 A CN 113620656A CN 202111050626 A CN202111050626 A CN 202111050626A CN 113620656 A CN113620656 A CN 113620656A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- 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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Abstract
A preparation method of a cold-mix fully-recycled asphalt mixture based on solvent type liquid asphalt. The method comprises the following steps: weighing waterborne epoxy resin and dibutyltin dilaurate curing agent, wherein the epoxy resin and the curing agent are jointly called a waterborne epoxy system, and the following components are added in percentage by weight: the mass ratio of the epoxy system is 1: 0.2-1: 0.4 weighing solvent type liquid asphalt; at normal temperature, uniformly stirring the epoxy resin, the curing agent and the solvent type liquid asphalt; drying the reclaimed asphalt mixture at 60 ℃ to constant weight; adding water-based epoxy solvent type liquid asphalt obtained after stirring and mixing according to the oil-stone ratio of 4.5-6.5%, adding mineral powder accounting for 10-20% of the mass of the reclaimed asphalt mixture and cement accounting for 2-4%, and mixing for 1min to obtain the asphalt mixture. The invention does not add any new aggregate, uses the solvent type liquid asphalt with simpler preparation method and more stable performance to replace the common emulsified asphalt, and improves the bonding performance of the solvent type liquid asphalt through a high-doping-amount water-based epoxy resin system.
Description
Technical Field
The invention belongs to the field of road engineering, and particularly relates to a preparation method of a cold-mix fully-recycled asphalt mixture based on solvent type liquid asphalt.
Background
In the present day that resources are continuously consumed and environmental problems are increasingly serious, the concept of waste utilization and sustainable development is widely regarded by various countries in the world, and research in various fields is developed towards sustainable direction. In the road field, the problems of serious high energy consumption and high pollution are caused by non-renewable raw materials such as asphalt used in the production process of asphalt pavements and a high-temperature mixing mode generally adopted at present.
On the premise that the concepts of low carbon and sustainable development are continuously deepened into the current industry, the cold recycling technology of the asphalt pavement is gradually paid attention by researchers in the road direction as a recycling technology capable of being mixed at a low temperature and paved at a low temperature. Compared with the common hot-mix asphalt mixture, the energy consumption and the carbon emission of the cold-recycling asphalt mixture in the links of raw material production, mixture production and transportation, pavement paving and the like are remarkably reduced. Meanwhile, the recycled mixture can also effectively consume the reclaimed asphalt mixture generated by the existing road overhaul and mid-elevation maintenance, and can reduce the consumption of non-renewable resources such as petroleum resources, high-quality stones and the like while solving the problems of land waste and environmental pollution caused by solid waste accumulation. However, from the current research results, because the milled recycled asphalt mixture does not have a certain gradation, the property differences of the recycled asphalt content and the asphalt aging degree among the recycled materials are obvious, and the cold-mix asphalt mixture has obvious performance disadvantages compared with the hot-mix asphalt mixture, the existing cold regeneration technology still has the problems of low utilization rate of the recycled asphalt mixture, obvious performance defects of the asphalt mixture, limitation of the application to the regeneration of a low-end staggered layer, and the like.
Disclosure of Invention
The invention aims to solve the performance defects of the current cold-recycling asphalt mixture and the problem of low utilization rate of reclaimed asphalt mixture, and provides a preparation method of a solvent-based liquid asphalt-based cold-mixing fully-recycled asphalt mixture, so as to realize the recycling of solid waste resources and the effective control of carbon emission.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a solvent-based liquid asphalt-based cold-mix fully-recycled asphalt mixture comprises the following specific steps:
step one, according to 1-2: 1, weighing water-based epoxy resin and a dibutyltin dilaurate curing agent according to the mass ratio, wherein the water-based epoxy resin and the dibutyltin dilaurate curing agent are jointly called a water-based epoxy system, and the mass ratio of the water-based epoxy resin to the dibutyltin dilaurate curing agent is as follows: the mass ratio of the water-based epoxy system is 1: 0.2-0.4 weighing solvent type liquid asphalt;
step two, mixing the water-based epoxy resin, the dibutyltin dilaurate curing agent and the solvent-based liquid asphalt at normal temperature, and stirring by a stirrer until the water-based epoxy resin, the dibutyltin dilaurate curing agent and the solvent-based liquid asphalt are fully mixed;
step three, completely drying the reclaimed asphalt mixture (RAP) to constant weight at 60 ℃, weighing mineral powder accounting for 10-20% of the mass of the reclaimed asphalt mixture and cement accounting for 2-4%, and adding the reclaimed asphalt mixture into a mixing pot to mix for 1 min;
step four, adding the water-based epoxy solvent type liquid asphalt prepared in the step two into the mixing pot in the step three according to the oil-stone ratio of 4.5-6.5% at normal temperature, and mixing for 1 min; the oil-stone ratio is the mass ratio of the water-based epoxy solvent type liquid asphalt to the total amount of RAP, mineral powder and cement;
and step five, adding the mineral powder weighed in the step three and cement into a mixing pot at normal temperature, and mixing for 1min to obtain the solvent-based liquid asphalt-based cold-mixing fully-regenerated asphalt mixture.
The invention uses a high-doping amount of water-based epoxy system to match with mineral powder and cement, improves the bonding force and simultaneously improves the gradation of the fully-regenerated asphalt mixture so as to improve the performance of the cold-regenerated asphalt mixture.
And further, in the second step, adding SBR styrene-butadiene latex emulsion with the mass of 1-3% of the solvent type liquid asphalt, and mixing the SBR styrene-butadiene latex emulsion with the solvent type liquid asphalt, a water-based epoxy system and a dibutyltin dilaurate curing agent to further improve the high and low temperature performance of the mixture.
And further, in the second step, adding waterborne polyurethane with the mass of 1-3% of that of the solvent-based liquid asphalt, and mixing the waterborne polyurethane with the solvent-based liquid asphalt, a waterborne epoxy system and a dibutyltin dilaurate curing agent to further improve the fatigue performance of the mixture.
Furthermore, the curing agent is replaced by a phenolic amine type modified resin curing agent, so that the use is more environment-friendly.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses the solvent type liquid asphalt with simpler preparation method and more stable performance to replace the commonly used emulsified asphalt; the formula does not contain new aggregates, can achieve the full reutilization of reclaimed materials of the asphalt mixture, and has no specific requirements on aggregate gradation; the prepared material uses a high-content water-based epoxy resin system to improve the early and later bonding properties of the solvent-based liquid asphalt; a certain amount of mineral powder and cement are used for making up the grading defect of the fully-regenerated asphalt mixture, and the performance of the cold-regenerated asphalt mixture is further improved by means of hydration of the cement and water in the water-based epoxy.
The invention adopts the high-doping-amount water-based epoxy system to be matched with the solvent-based liquid asphalt to realize the cold-mixing full regeneration of the asphalt mixture, and the high-doping-amount water-based epoxy can form a three-dimensional cross-linked network structure in the liquid asphalt and can effectively improve the viscosity of the liquid asphalt, thereby improving the bonding capacity with the reclaimed asphalt mixture and achieving the purpose of improving the performance of the cold-regenerated asphalt mixture. The curing of the water-based epoxy system can effectively improve the early strength of the cold-recycling asphalt mixture, and the volatilization of light components in the solvent-based liquid asphalt can further improve the later strength of the cold-recycling asphalt mixture along with the time. Meanwhile, the addition of the mineral powder and the cement solves the problem of low content of fine aggregates in the reclaimed asphalt mixture, and the cement can also generate a hydration reaction with water in a water-based epoxy system, so that the performance of the cold-mixed fully-regenerated asphalt mixture is further improved.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1:
the preparation method of the cold-mix fully-recycled asphalt mixture based on the solvent-based liquid asphalt is implemented according to the following steps:
first, 42g of solvent-based liquid asphalt, 8.6g of waterborne bisphenol A epoxy resin and 4.3g of dibutyltin dilaurate curing agent are weighed at normal temperature.
Secondly, 8.6g of waterborne bisphenol A epoxy resin and 4.3g of dibutyltin dilaurate curing agent are mixed at normal temperature, and stirred by a stirrer for 1min until the mixture is fully mixed.
And thirdly, mixing the mixture obtained in the second step with 42g of solvent type liquid asphalt at normal temperature, and stirring for 1min by a stirrer until the mixture is fully mixed.
And fourthly, completely drying 1000g of reclaimed asphalt mixture (RAP) at the temperature of 60 ℃ to constant weight, and adding the RAP into a stirring pot to stir for 1 min.
And fifthly, adding 54.9g of the water-based epoxy solvent type liquid asphalt obtained in the step three into a mixing pot at normal temperature, and mixing for 1 min.
And sixthly, adding 200g of mineral powder and 30g of cement into a mixing pot at normal temperature, and mixing for 1min to obtain the solvent-based liquid asphalt-based cold-mixed fully-regenerated asphalt mixture.
Example 2:
this example differs from example 1 in that:
secondly, mixing the solvent type liquid asphalt with the dibutyltin dilaurate curing agent at normal temperature, and stirring for 2min by a stirrer until the solvent type liquid asphalt and the dibutyltin dilaurate curing agent are fully mixed.
And thirdly, mixing the mixture obtained in the step one with the water-based bisphenol A epoxy resin at normal temperature, and stirring for 1min by a stirrer until the mixture is fully mixed.
The asphalt mixture obtained in example 1 was subjected to an evaluation test:
test one:
firstly, 1150g of cold-mix fully-recycled asphalt mixture based on solvent type liquid asphalt is weighed and added into a Marshall test mold coated with vaseline at one time, and the front and the back of the mixture are compacted for 50 times.
And secondly, immediately demoulding the compacted test piece, and testing the stability of the demoulded test piece at 25 ℃ according to a test method in road engineering asphalt and asphalt mixture test regulation (JTG E20-2011) to obtain the initial strength of the test piece.
And (2) test II:
firstly, 1150g of cold-mix fully-recycled asphalt mixture based on solvent type liquid asphalt is weighed and added into a Marshall test mold coated with vaseline at one time, and the front and the back of the mixture are compacted for 50 times.
And secondly, placing the compacted test piece in a 110 ℃ oven for curing for 24 hours in a mold, compacting the front and back surfaces for 25 times, and then demolding.
And thirdly, testing the stability of the demolded test piece at 25 ℃ according to a test method in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011) to obtain the forming strength of the demolded test piece.
The test results of the first test and the second test show that the initial strength of the cold-mixed fully-recycled asphalt mixture reaches 3.26kN, the forming strength reaches 32.24kN, and the cold-mixed fully-recycled asphalt mixture meets related requirements and is superior to most cold-recycled asphalt mixtures.
Claims (4)
1. A preparation method of a cold-mix fully-recycled asphalt mixture based on solvent type liquid asphalt is characterized by comprising the following steps: the method comprises the following specific steps:
step one, according to 1-2: 1, weighing water-based epoxy resin and a dibutyltin dilaurate curing agent according to the mass ratio, wherein the water-based epoxy resin and the dibutyltin dilaurate curing agent are jointly called a water-based epoxy system, and the mass ratio of the water-based epoxy resin to the dibutyltin dilaurate curing agent is as follows: the mass ratio of the water-based epoxy system is 1: 0.2-0.4 weighing solvent type liquid asphalt;
step two, mixing the water-based epoxy resin, the dibutyltin dilaurate curing agent and the solvent-based liquid asphalt at normal temperature, and stirring by a stirrer until the water-based epoxy resin, the dibutyltin dilaurate curing agent and the solvent-based liquid asphalt are fully mixed;
step three, completely drying the reclaimed asphalt mixture to constant weight at 60 ℃, weighing mineral powder accounting for 10-20% of the mass of the reclaimed asphalt mixture and cement accounting for 2-4%, and adding the reclaimed asphalt mixture into a mixing pot to mix for 1 min;
step four, adding the water-based epoxy solvent type liquid asphalt prepared in the step two into the mixing pot in the step three according to the oil-stone ratio of 4.5-6.5% at normal temperature, and mixing for 1 min; the oil-stone ratio is the mass ratio of the water-based epoxy solvent type liquid asphalt to the total amount of RAP, mineral powder and cement;
and step five, adding the mineral powder weighed in the step three and cement into a mixing pot at normal temperature, and mixing for 1min to obtain the solvent-based liquid asphalt-based cold-mixing fully-regenerated asphalt mixture.
2. The preparation method of the solvent-based liquid asphalt-based cold-mix fully-recycled asphalt mixture according to claim 1, characterized by comprising the following steps: and in the second step, adding SBR (styrene butadiene rubber) latex emulsion accounting for 1-3% of the mass of the solvent type liquid asphalt, and mixing the SBR latex emulsion with the solvent type liquid asphalt, a water-based epoxy system and a dibutyltin dilaurate curing agent.
3. The preparation method of the solvent-based liquid asphalt-based cold-mix fully-recycled asphalt mixture according to claim 1, characterized by comprising the following steps: and in the second step, adding waterborne polyurethane with the mass of 1-3% of that of the solvent-based liquid asphalt, and mixing the waterborne polyurethane with the solvent-based liquid asphalt, a waterborne epoxy system and a dibutyltin dilaurate curing agent.
4. The preparation method of the solvent-based liquid asphalt-based cold-mix fully-recycled asphalt mixture according to claim 1, characterized by comprising the following steps: the curing agent is replaced by a phenolic amine type modified resin curing agent.
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| CN202111050626.XA CN113620656A (en) | 2021-09-08 | 2021-09-08 | Preparation method of cold-mix fully-recycled asphalt mixture based on solvent-based liquid asphalt |
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| CN202111050626.XA CN113620656A (en) | 2021-09-08 | 2021-09-08 | Preparation method of cold-mix fully-recycled asphalt mixture based on solvent-based liquid asphalt |
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Cited By (1)
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