Asphalt mortar self-repairing performance evaluation method based on shape memory properties

Abstract

The invention discloses an asphalt mortar self-repairing performance evaluation method based on shape memory properties and belongs to the technical field of asphalt pavement durability. The problems that an asphalt mortar self-repairing performance testing method is absent, the fatigue test method is high in time consumption, the operation is complicated and the test result is poor in repeatability and reproducibility are solved. The method disclosed by the invention comprises the following steps: preferably selecting shape memory staple fibers and thermoplastic particles, wherein the fibers serve as a mortar reinforcing material and are endowed with the shape memory function; preparing an asphalt mortar small beam test specimen, performing a three-point bending test, stopping loading when the crack of the small beam test specimen is expanded to a fine line at 5mm on the top of the beam, and recording the maximum flexural-tensile strength Ri; and maintaining the small beam which is not completely broken in a drying oven, repeating the test on the cooled test specimen, recording the maximum flexural-tensile strength Rs, taking a ratio of the Rs to Ri as an index for evaluating the self-repairing effect, comparing the mixing amount and self-repairing effect of different staple fibers and thermoplastic particles, and determining the optimal mixing amount, so that the service life of the asphalt pavement is prolonged.

Description

technical field [0001] The invention relates to a self-repair performance evaluation method of asphalt mortar based on shape memory performance, and belongs to the technical field of asphalt pavement durability. Background technique [0002] In recent years, China's highway construction has achieved rapid development, but there is still a certain gap with developed countries. The climate and environment have deteriorated, and greenhouse gas emissions have not been controlled but have been soaring; the traffic volume of modern traffic has increased, and the problem of overloading has become serious. In addition, the scale of roads has continued to expand, and problems in construction technology and management have become prominent. Therefore, the durability of pavement materials has been improved. Sex is desperate. Coupled with the limitation of detection tools, the asphalt pavement often has micro-cracks in the early stage of the design period but cannot be repaired. There...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is a self-repair performance evaluation method of asphalt mortar based on shape memory performance, which solves the problems of lack of self-repair performance test method of asphalt mortar, fatigue test method takes a long time, cumbersome operation, poor repeata