Negative thermal expansion modified asphalt caulking material

Abstract

The invention belongs to the technical field of pavement materials, and specifically discloses a negative thermal expansion modified asphalt caulking material and an application method thereof. The modified asphalt caulking material comprises the components in percentages by weight: 40-62% of base asphalt, 4-10% of negative thermal expansion materials, 3-5% of expansion coordination agents, 30-42% of filler and 1-3% of additives. The base asphalt is SBS modified asphalt, the negative thermal expansion materials are zinc cyanide, cadmium cyanide; the expansion coordination agent is zirconium phosphate sodium; the filler is calcium power, and the additives are sodium polyacrylate or polyoxyethylene polyoxypropylene copolymers. The caulking material disclosed by the invention can effectively control crack propagation caused by material thermal expansion and contraction, so that cracks in old cement concrete pavement can be effectively filled, so that the material plays a role of water resistsance, and the driving comfort can be improved. The caulking material disclosed by the invention can be popularized and applied in functional repair of old cement concrete pavement and building cracks filling engineering.

Description

technical field [0001] The invention relates to the technical field of pavement material engineering, in particular to a negative expansion modified asphalt joint filling material and an application method thereof. Background technique [0002] Cement concrete pavement has the advantages of strong bearing capacity and long service life, and has been widely used. At this stage, the prices of cement and steel bars in the country continue to drop, but it is difficult to expand the scope of application of cement concrete pavement, which has attracted the attention of many scholars. Cement concrete pavement is one of the most common pavements, and the biggest problem it faces is the occurrence of initial cracks and the expansion of cracks in the later stage. In order to maintain the durability and driving comfort of cement concrete pavement, joint filling materials are usually used for joint filling treatment, and even asphalt layers are added. These treatment measures cannot ef...

AI Technical Summary

Problems solved by technology

In order to maintain the durability and driving comfort of cement concrete pavement, joint filling materials are usually used for joint filling treatment, and even asphalt layers are added. These treatment measures cannot effectively alleviate the crack reflection problem of old cement concrete

The reason is that the thermal expansion and contraction of cement concrete is more obvious, and the joint filling material is also a thermal expansion and contraction material. During the cooling process, it is easy to form cracks between the two due to insufficient cohesive force and then separate from each other. Rainwater seeps into the roadbed along the cracks, causing the overall bearing capacity of the road to decrease

In order to solve such problems, some scholars proposed epoxy resin joint technology, stress-absorbing tape technology, and high-permeability emulsified asphalt technology, which also brought new technical problems: epoxy resin has strong bonding performance and difficult construction. Severe mechanical damage; large construction area of ​​stress absorption zone, low economic benefits; high-permeability emulsified asphalt has great environmental pollution and poor application performance

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