Measurement Accuracy Comparison of In-Situ Asphalt Pavement Strain Sensors Based on Digital Image Correlation Technique

被引：0

作者：

Zhao H. ^{[1
]}

Gu S. ^{[1
]}

Ma L. ^{[1
]}

机构：

[1] Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai

来源：

Tongji Daxue Xuebao/Journal of Tongji University | 2018年 / 46卷 / 09期

关键词：

Accuracy comparison; Digital image correlation; In-situ asphalt pavement strain sensors; Measurement method; Pavement engineering;

D O I：

10.11908/j.issn.0253-374x.2018.09.008

中图分类号：

学科分类号：

摘要：

A method to measure strain distribution on the asphalt mixture surface was developed based upon DIC (digital image correlation) in order to compare the measurement accuracy of in-situ asphalt pavement strain sensors. First, the displacement was distinguished at sub-pixel level using the DIC technique. Then an algorithm to calculate average tensile strain was proposed to eliminate the adverse effect caused by asphalt mixture inhomogeneous deformation in strain measurement. After testing the reliability of the algorithm, the measurement accuracy of two common in-situ asphalt pavement strain sensors were calibrated. It was found that the error of the DIC method was less than 12×10-6 at the 90% confidence level, which met the requirement of accuracy comparison. Besides, it was proved that the measurement accuracy could be reflected by the error between the measurement result of the sensors and the method developed in this paper. It was also proved that load type had an influence upon sensor's accuracy. Utilization of calibration function or eliminatation of the cumulative plastic strain all contributed to the improvement of accuracy. © 2018, Editorial Department of Journal of Tongji University. All right reserved.

引用

页码：1211 / 1217

页数：6

共 19 条

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