Composite binder for repairing of pits in asphalt pavement and preparation method of composite binder

Abstract

The invention discloses a composite binder for repairing of pits in an asphalt pavement and a preparation method of the composite binder. The composite binder comprises 100 parts of SBS (styrene-butadiene-styrene) modified emulsified asphalt, 10-22.2 parts of water-borne epoxy resin, 5-11.1 parts of a water-borne curing agent, 41.7-62.5 parts of cement and 0.5-2 parts of a tackifier. The method comprises steps as follows: the water-borne epoxy resin and the water-borne curing agent are uniformly mixed in a certain proportion, and the SBS modified emulsified asphalt in a certain proportion is mixed in the formed mixture; an obtained waterborne epoxy emulsified asphalt mixed solution is sheared at a high speed for certain time, cement and a coupling water solution in a certain proportion are added, the mixture is continuously stirred for certain time, and the anti-shear, anti-drawing, anti-fatigue and durable composite binding material for repairing of the pits in the asphalt pavement can be obtained. The prepared CWEA type composite binder has higher anti-shear and anti-drawing performance at low temperature, also has excellent anti-shear, anti-fatigue and durable characteristics at high temperature and is an organic and inorganic composite which has good processability and can be used for repairing of pits formed in the asphalt pavement in catastrophes.

Description

technical field [0001] The invention relates to the technical field of asphalt composite modification, in particular to a preparation method of a shear-resistant, drawing-resistant, fatigue-resistant and durable composite binder for asphalt pavement pothole repair. Background technique [0002] At present, binders such as SBS modified emulsified asphalt and SBR modified emulsified asphalt used for pothole repair of trunk road asphalt pavement have the advantages of mechanized preparation, low production cost, and rapid opening of traffic. Using adhesive layer or permeable layer materials with low index values, the mechanical index of the interface of pothole repairing joints cannot meet the design requirements, and boundary bonding failure and cracking often occur in a short period of time after repairing, and the bonding efficiency such as edge gnawing at the repairing joints is low 1. The phenomenon of poor repair durability. In order to solve this problem, it is urgent to...

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Problems solved by technology

[0008] After the composite material prepared by the above method is used for interface bonding, the high-temperature shear stability is poor, and it is not conducive to the improvement of the bonding effect under the hot and humid environment in summer.

Therefore, the single modification of emulsified asphalt is not enough to solve the problem of high temperature shear resistance of the binder. The higher the temperature, the performance of the single modified mixture is dominated by asphalt, and the lower the shear resistance effect is, while cement can effectively improve its high temperature resistance. However, the compatibility and homogeneity of multi-phase materials are still prominent due to the composite modification of multi-phase materials. Due to the different material densities, the addition of insufficient or too much inorganic material cement may result in insignificant bonding effects or a decrease in the viscoelasticity of the material. , Increased plastic stiffness, poor flexibility, so seek to achieve the best performance match between high and low temperature shear resistance, mechanical properties of drawing, fatigue resistance, durability and spraying operability

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