Abstract
Traffic loads and the corresponding induced strains are great driving factors for various pavement distresses. The Traffic Load Influence Zone (TLIZ) containing the effective traffic induced strains of the Hot Mixed Asphalt (HMA) layer in an indoor inverted pavement was investigated utilizing Strain Foils (SFs) under truckloads applied by Heavy Vehicle Simulator (HVS). 84 SFs were installed in longitudinal and transverse directions at the bottom of HMA layer to characterize the strain field and to evaluate the dimension of TLIZ. Test results showed that longitudinal strains illustrated average strain amplitude 101 microstrain higher than transverse strains for positions within the wheel path. In lateral positions outside wheel paths, longitudinal strains were in tension and higher than transverse strains which were in compression, while much higher tensile strains were measured at the wheel gap center. Positions inside the wheel path illustrated even higher tensile strains than the wheel gap center, and longitudinal strains demonstrated higher magnitude than transverse strains. Accordingly, it is believed that longitudinal strain inside the wheel path is the critical response related to cracking in inverted pavements. The strain field distributions indicate that the TLIZ dimension under HVS load is approximately 300 cm in longitudinal direction and 68 cm in transverse direction. Longitudinal positions within 37 cm of the loading position inside the wheel path showed the most significant strain response and therefore had the highest risks of developing pavement distress.
Published Version
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