Single-stage double-shaft pre-deformation method for endowing pavement joint material with shape memory function

Abstract

The invention provides a single-stage double-shaft pre-deformation method for endowing a pavement joint material with a shape memory function, belongs to the technical field of cement pavement, and solves the problem that existing single-stage single-shaft pre-deformation method can only endow the material with the shape memory function in one direction, and thus the material is poor in self-healing effect. A cruciform specimen of a shape memory polymer matrix composite is produced at first, pre-compaction deformation is performed along the vertical direction at the temperature higher than a glass-transition temperature, meanwhile prestretching deformation is performed along the horizontal direction, and thus the joint material is endowed with the shape memory function in both horizontal and vertical directions; then the shape memory effect of the joint material after pre-deformation is measured and further synthesized with other operational performance of the joint material to determine reasonable stretching and compression pre-strain values for endowing the joint material with the shape memory function. According to the pre-deformation method provided by the invention, the joint material actively adapt to cyclic change of the width of the cement pavement joint, usability and durability of the joint material are improved, and service life of the cement pavement is prolonged.

Description

technical field [0001] The invention relates to a single-stage biaxial 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. Background technique [0002] With the development of my country's social economy, the construction of highways has been developing vigorously. Due to its high strength, good stability, and good durability, cement pavement has become one of the main pavement types of high-grade pavements and is widely used in Large-scale projects such as highways and airport runways. With the rapid development of highway construction, the service life of cement concrete pavement is far lower than expected. Our country mostly uses ordinary cement concrete pavement, and expansion joints need to be set between concrete slabs. The use of excellent caulking materials can effectively improve the cement concrete pavement. performance and prolong structural life. ...

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a single-stage biaxial pre-deformation method for endowing cement pavement joint materials with shape memory function. The method is to carry out pre-compression deformation along the horizontal direction to the design strain value under high temperature conditions higher than the glass transition temperature , at the same time carry out pre-tension deformation along the vertical direction to the design strain value, so as to endow the caulk with shape memory function in the horizontal and vertical two-dimensional directions at the same time, and solve the problem that the current single-stage uniaxial pre-deformation method can only endow Material shape memory function, poor self-healing effect, high cost, difficult to completely solve the problems of cement pavement caulk falling off, extrusion, cracking, water seepage, etc.

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