Permeability-based ultrasonic verification method of asphalt pavement preventative maintenance opportunity

Abstract

The invention discloses a permeability-based ultrasonic verification method of asphalt pavement preventative maintenance opportunity. The method comprises the steps as follows: firstly, building an indoor asphalt mixture damage-permeability model, which comprises steps as follows: a, taking test pieces to perform different degrees of uniaxial compression and diametral compression tests, so as to obtain different types and degrees of damage, b, respectively performing dynamic modulus testing on the test pieces before and after being damaged, so as to obtain damage D indicated by dynamic modulus, c, performing ultrasonic testing on the test pieces before and after being damaged, so as to obtain damage Du indicated by ultrasonic variation, building the relation between Du and D, and simultaneously performing dimension modification on Du by testing the test pieces at different heights, d, building an ultrasonic damage-permeability model, and e, obtaining the asphalt mixture damage threshold value of preventative maintenance and the ultrasonic wave speed threshold value corresponding to the asphalt mixture damage threshold value; and secondly, verifying the asphalt pavement preventative maintenance opportunity. The method can accurately judge pavements in advance, delay the development of pavement diseases, prolong the service life of the pavements, and save cost.

Description

technical field [0001] The invention belongs to the field of transportation, in particular to an ultrasonic testing method for preventive maintenance timing of asphalt pavement based on permeability. Background technique [0002] At present, preventive maintenance of pavement is a maintenance concept. The core idea is to carry out active maintenance when there is no disease or even a good condition on the pavement, so as to delay the development of pavement diseases, delay the time of maintenance, overhaul or reconstruction, and prolong the service life of the road. , saving maintenance costs. In preventive maintenance, the determination of maintenance timing is the key. At present, the technical indicators for determining the timing of preventive maintenance of asphalt pavement are mainly asphalt aging degree, pavement permeability, road safety performance (mainly including anti-skid performance and rutting degree) and pavement damage. Among them, the water seepage perfor...

AI Technical Summary

Problems solved by technology

Pavement permeability has a significant correspondence with the degree of pavement damage, but the existing research on the timing of preventive maintenance of asphalt pavement has not given a quantitative standard for permeability

Images