Validation of the dynamic response of the HMA layer in an inverted pavement measured by strain foils

Zhenqiang Han; Aimin Sha; Liqun Hu; Rongzong Wu

doi:10.3139/120.111414

Article

Validation of the dynamic response of the HMA layer in an inverted pavement measured by strain foils

Zhenqiang Han , Aimin Sha , Liqun Hu and Rongzong Wu

Published/Copyright: September 26, 2019

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From the journal Materials Testing Volume 61 Issue 10

Abstract

Strain in pavement caused by traffic loading is a critical driver for various distress mechanisms. In this study, strain foils (SFs) are utilized to measure longitudinal strains at the bottom of a hot mixed asphalt (HMA) layer in an indoor inverted pavement. The validity and reliability of SF-measured strain are investigated through three tests using a heavy vehicle simulator (HVS). The three tests focus on the consistency and stability of strain measured by individual SFs and various SFs installed at similar positions, as well as the consistency of strain measured by SF and an asphalt strain gauge (ASG) at different test speeds, load levels, and loading cycles in an accelerated pavement test (APT). Fast Fourier transform is utilized to filter out interference in the raw SF strain data. Filtered SF-measured strains were converted into ASG-measured strain based on effective gauge lengths. Research results show that converted SF-measured strains did not reveal a significant statistical difference compared with strains simultaneously collected by ASG under different test loads and speeds throughout the APT at 300,000 repetitions. Moreover, individual SF can provide consistent results with the coefficient of variation (CV) less than 3.3 % under different speeds and load levels, and SFs installed at similar positions showed similar average maximum strain variations (MSVs) with a maximum difference of 5.8 %. Moreover, the linear correlations between the average MSV and the test load, as well as the speed further verified the validity of SF-measured strain. It is believed that SF could be a viable alternative for strain monitoring in asphalt pavement.

∗Correspondence Address, Prof. Dr.-Ing. Aimin Sha, Director of Key Laboratory, for Special Area Highway Engineering, Ministry of Education, Chang'an University, Middle-section of Nan'er Huan Road, Xi'an, Shaanxi, 710064, P. R. China, E-mail: jasonhan029@126.com, ams@chd.edu.cn

Zhenqiang Han, PhD candidate, born in 1991, received his Bachelor's degree in 2014 and has been pursuing his Doctoral degree since 2014 at Chang'an University, Xi'an, Shaanxi province, China. His research interests include asphalt pavement materials testing and characterization, accelerated pavement testing, long-term performance evaluation and pavement structure design. He participated in and accomplished the state-fund projects of “Study on the high-performance pavement structure and material durability of highway in permafrost region” and “Study on the long-term performance of asphalt pavement”, and some other industry funded projects.

Prof. Dr.-Ing. Aimin Sha, born in 1964, received his Master's degree at Chang'an University, Xi'an, Shaanxi, China and his Doctoral degree at Kharkov National Automobile and Road Technology University, Ukraine. He conducted many in-depth research projects on major theoretical and practical issues arising from road construction and maintenance. He is the Vice-Chairman of the Materials Testing Committee of the Chinese Society of Mechanics and the director of the Key Laboratory for Special Area Highway Engineering of Ministry of Education, Xi'an, China.

Prof. Dr.-Ing. Liqun Hu, born 1971, studied Highway and Railway Engineering at Chang'an University, Shaanxi province, China. He received his Master's degree in 2000 and Doctoral degree in 2004 at Chang'an University. His research is focused on pavement material design and evaluation, construction quality control, environmentally friendly pavement theory and construction techniques. He is the director of the Institute of Road Engineering in Chang'an University and the state council special allowance specialist.

Dr.-Ing. Rongzong Wu holds his Doctoral degree from the University of California, Berkeley, USA. His research includes finite element analysis and fracture mechanisms of highway materials and structure and the empirical-mechanistic design approach of asphalt and cement concrete pavements. Since 2007, he has been the project scientist at the University of California Pavement Research Center, Davis, US. He accomplished some projects regarding full depth reclamation, hot mix asphalt concrete rutting model and falling weight deflectometer data analysis.

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Published Online: 2019-09-26

Published in Print: 2019-10-02

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https://doi.org/10.3139/120.111414