A pre-deformation method for endowing cement pavement joints with shape memory function

Abstract

The invention provides a pre-deformation method capable of endowing a cement pavement calking material with a shape memory function, belongs to the technical field of cement pavement calking material preparation, and solves the problems of one-way shape memory function endowing , poor self-healing effect, complex temperature control requirement, high cost, limited preparation amount, poor durability and the like in the current pre-deformation method for the cement pavement calking material. The pre-deformation method comprises the following steps: stretching and deforming a calking material vertically to a design strain value at the temperature which is higher than a calking material glass transition temperature, and freezing a pre-stretching strain; applying compressive stress at a constant speed to a test piece in a vertical stretching direction at a normal temperature to enable the test piece to reach a preset compressive strain level, fixing the pre-compressive strain value, and endowing the calking material with the shape memory function in a two-dimensional direction; measuring the shape memory effect and other pavement performance of the calking material, and preferably selecting a group of reasonable stretching and compressive pre-strain value combination. According to the method provided by the invention, the difficulty in two-dimensional pre-deformation is reduced, so that the calking material has a better shape memory effect, and the durability of the calking material and a cement pavement are improved.

Description

technical field [0001] The invention relates to a pre-deformation method for endowing a cement pavement caulking material with a shape memory function, and belongs to the technical field of cement pavement caulking material preparation. Background technique [0002] Cement pavement has the advantages of high strength, good stability, good durability and is conducive to driving at night. It is one of the main pavement types in my country. It is mainly used for highways and urban roads. Cement pavement is widely used, and the joint cement pavement is the main one. This kind of cement pavement needs to use various caulking materials to seal the joints, maintain the integrity, smoothness and water tightness of the pavement from the structure, and improve the durability and driving comfort of the cement pavement. [0003] However, most of the caulking materials at home and abroad are insufficient. At present, the cement pavement caulking materials mainly use traditional materials...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a two-stage uniaxial pre-deformation method for endowing cement pavement joint materials with shape memory function, so as to solve the problem of one-way endowment of shape memory function and self-healing existing in the current single-stage uniaxial or biaxial pre-deformation method Poor effect, complex temperature control requirements, high cost, limited preparation, difficult engineering application, poor durability, etc.

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