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Method of detecting asphalt pavement structure damage based on fiber grating sensors

A fiber grating and asphalt pavement technology, applied to instruments, roads, roads, etc., can solve the problems of high price, cost limitation, and inability to reuse, and achieve the effect of improving service life, high feasibility, and authentic and credible judgment methods

Active Publication Date: 2017-06-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods for detecting the strain value of asphalt roads at home and abroad: fiber grating strain sensor and resistive strain gauge. Fiber grating sensor has high detection accuracy and strong anti-electromagnetic interference ability, but its price is high. It cannot be reused after concrete, so the cost problem greatly limits its application

Method used

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  • Method of detecting asphalt pavement structure damage based on fiber grating sensors
  • Method of detecting asphalt pavement structure damage based on fiber grating sensors
  • Method of detecting asphalt pavement structure damage based on fiber grating sensors

Examples

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Embodiment 1

[0039] A damage monitoring method for asphalt pavement structure based on fiber Bragg grating strain sensor. The actual asphalt pavement structure is simulated according to the indoor rutting test, and the loading process of the pavement is simulated through the accelerated loading test. The pavement cracking caused by the rutting of the specimen is reflected by the surface strain, and the structural damage of the pavement is analyzed in combination with the rutting displacement.

[0040] In order to test the feasibility of the fiber grating surface strain sensor and monitoring method, according to road construction experience, the rutting specimen gradation adopts AC-13, the asphalt is domestic No. 70 matrix, and the asphalt ratio is 4.8%, simulating the upper layer of asphalt expressway structure. The rutting specimens were formed by the T0702-2011 asphalt mixture specimen preparation method (wheel rolling method) in the "Test Regulations for Asphalt and Asphalt Mixtures in ...

Embodiment 2

[0057] A damage monitoring method for asphalt pavement structure based on fiber Bragg grating strain sensor. The actual asphalt pavement structure is simulated according to the indoor rutting test, and the loading process of the pavement is simulated through the accelerated loading test. At the same time, the surface strain of the rutting specimen is detected in real time by the fiber grating surface strain sensor. , the pavement cracking caused by the rutting of the specimen is reflected by the surface strain, and the pavement rutting failure is analyzed in combination with the rut depth.

[0058] In order to better simulate the actual pavement structure, the combined rutting test piece is divided into upper, middle and lower surface layers, and the size of the test mold is 1m×0.5m; the bottom of the lower layer uses epoxy resin to paste limestone gravel to simulate the base structure. The thickness is not more than 1cm. The gradation of each layer from bottom to top is AC-25...

Embodiment 3

[0074] A method for monitoring the damage of asphalt pavement structure based on fiber grating strain sensor, which is characterized in that the actual asphalt pavement structure is simulated according to the indoor rutting test, the loading process of the pavement is simulated through the accelerated loading test, and the rutting test is monitored in real time by the fiber grating surface strain sensor The surface strain of the specimen is used to reflect the pavement cracking caused by rutting of the specimen through the surface strain, and the rutting damage of the pavement is analyzed in combination with the rut depth.

[0075] In order to better simulate the actual pavement structure, the combined rutting test piece is divided into upper, middle and lower surface layers, and the size of the test mold is 1m×0.5m; the bottom of the lower layer uses epoxy resin to paste limestone gravel to simulate the base structure. The thickness is not more than 1cm. The gradation of each...

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Abstract

The invention discloses a method of detecting the asphalt pavement structure damage based on fiber grating sensors. The method comprises the following steps: 1) fixedly installing one or more fiber grating sensors on the surface of a rut sample; 2) setting test parameters for accelerating loading, simulating the formation of a rut trough accelerating loading tests and monitoring the fiber grating sensors in real time; 3) monitor strain values of the fiber grating sensors and making the relation curve graph between the number of load and the surface strain values of the sample; and 4) performing the sample structure damage analysis, that is, analyzing the deformation and damage degree of the sample through the surface strain values. The method for detecting the asphalt pavement structure damage is simple in operation and high in feasibility, and is of great theoretical significance on the design and maintenance of pavement structures. The surface fiber grating strain sensors are adopted to monitor the asphalt pavement strain response. The process is simple, implementation is easy, and recycling is realized.

Description

technical field [0001] The invention relates to the technical field of road performance evaluation, in particular to a method for detecting structural damage of asphalt pavement based on a fiber grating sensor. Background technique [0002] Under the coupling effect of overload, heavy load, ultra-frequency load and temperature, pavement cracking caused by structural deformation often occurs in the early stage of asphalt pavement. Cracks in asphalt pavement should be repaired in time, otherwise rainwater and other sundries will enter the surface layer structure and Subgrade, accelerated road damage. On the other hand, the current road design codes in my country use stress as the detection index of pavement structure failure performance, while foreign countries use strain, which can best reflect the local characteristics of the structure, as the design index. The inhomogeneity of the asphalt concrete material leads to local stress concentration under load, and when the tensil...

Claims

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Application Information

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IPC IPC(8): E01C23/01G01B11/16G01N3/08G01N15/08
CPCE01C23/01G01B11/16G01N3/08G01N15/088G01N2203/0003G01N2203/0019G01N2203/0075G01N2203/0682
Inventor 吴少鹏陈俊丽庞凌肖月陈美祝刘刚刘全涛
Owner WUHAN UNIV OF TECH
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