Modulus attenuation of semi-rigid asphalt pavement layer in accelerated pavement testing with MLS66  

作　　者：Yue Hu Lijun Sun Huailei Cheng Yi Li 

机构地区：[1]The Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China

出　　处：《International Journal of Transportation Science and Technology》2023年第1期62-70,共9页交通科学与技术(英文)

基　　金：supported by the grant from the National Key R&D Program of China(2018YFB1600100).

摘　　要：This research aimed to investigate the attenuation mode of the layer modulus of asphalt pavement in accelerated pavement testing(APT).A full-scale experimental section was constructed and tested using the APT facility.Two non-destructive testing(NDT)methods,named falling weight deflectometer(FWD)technique and portable seismic property analyzer(PSPA)test,were used to obtain the layer moduli of asphalt pavement during the APT test.The variation patterns of layer moduli obtained by FWD and PSPA tests were calculated and compared after the temperature was corrected to 20℃.It was found that the variation pattern of surface layer modulus based on field FWD measurements was consistent with the one measured from PSPA tests.That is the modulus of the surface layer increases with the APT load repetitions firstly and then decreases with the rise of the repetitions.The modulus values of the surface layer measured from PSPA tests are obviously larger than those backcalculated based on deflection basins.The ratio of the measured surface layer modulus based on the PSPA test to the backcalculated one based on the FWD test ranges between 2.06 and 2.71.The backcalculated base layer modulus always declines with the increasing loading repetitions.The attenuation patterns of the surface layer modulus and the base layer modulus in the damage stage are described as E_(α)=421100*N^(-0.6119)and E_(b)=128000*N^(-031096),respectively.

关 键 词：APT FWD PSPA Backcalculation modulus Modulus attenuation 

分 类 号：U41[交通运输工程—道路与铁道工程]