Method for self-repairing shape memory effect based joint sealant for concrete pavement through two steps

Abstract

The invention provides a method for self-repairing a shape memory effect based joint sealant for a concrete pavement through two steps, belongs to the technical field of the joint sealant for the concrete pavement, and solves the problems of one-time repairing, poor repeatability, and microfracture repairing only of a current repairing method. A pre-deformation method is firstly used to give a shape memory function to the joint sealant in the horizontal direction, a prepressing strain energy is stored, the shape restoration force of the joint sealant mounted in a joint of the cement pavement is closed on a macrostructure scale when the temperature rises, a thermoplastic polymer nano-particle embedded in the joint sealant in advance is melt to implement cross-linked polymerization and curing reaction, then the self-repairing on a molecular scale is conducted, the conditions of a fracture or damage closure on the structure scale are observed, the self-healing process of the fracture or damage closure on the macrostructure scale is known, the interfacial energy of two free surfaces is measured, and the self-repairing effect of the two free surfaces on the molecular scale is evaluated. The method repeatedly implements self-repairing of the fracture of the joint sealant on the macro scale, and the durability of the joint sealant is improved.

Description

technical field [0001] The invention relates to a two-step self-repair method for a cement pavement caulking material based on a shape memory effect, and belongs to the technical field of cement pavement caulking materials. Background technique [0002] As the weak link of the bridge deck and cement pavement, the failure of the expansion joint is one of the causes of structural damage. A variety of caulks are used to seal the expansion joints of cement pavement and bridge decks. The construction methods are divided into three categories: heating construction, normal temperature construction, and pre-set sealing strips. A comprehensive review of the existing cement pavement For caulking, it can be found that in addition to aging, the damage of caulking is mainly due to the failure of the bond on both sides or one side to pay the force or the damage of cohesion, and internal small cracks appear. According to the research survey, the evaluation and inspection every five years ...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a two-step self-repair method for cement pavement caulk based on the shape memory effect. The method is to first close the cracks or damage two free surfaces on the macroscopic structural scale of the caulk, and then melt between the free surfaces. The physical cross-linking between thermoplastic particles and matrix realizes self-healing at the molecular scale, thereby solving the problems of one-time repairing, poor repeatability, and only repairing micro-cracks in current self-healing methods. Durability of sewing material

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