Experimental study on interlayer shear properties of ERS pavement system for long-span steel bridges

摘要

Multi-layer asphalt concrete pavement system on long-span steel bridges is subject to a complex stress and strain state due in part to frequent vehicular braking and accelerating actions and also to relatively weak bond interfaces between pavement layers. In particular, the interlayers are vulnerable to shear activities induced by the aforementioned vehicular actions, leading to spalling, loosening and shoving failures of the pavement. In this study, the interlayer shear performance is investigated experimentally using an innovative test device loaded on existing MTS. Best practices for interlayer composition are proposed based on shear test results, including bonding material and dosage, crushed stone size and dosage, pre-coating treatment of crushed stones, and layer surface treatment. Sensitivity analyses of loading rate and temperature on the interlayer shear performance are conducted as well. It is found that bonding material and surface treatment both can significantly influence the interlayer shear strength. Moreover, slower shear rate and higher temperature can cause poorer interlayer shear performance triggering onset of interlayer shear failures. (C) 2017 Elsevier Ltd. All rights reserved.