Assessment of bonding behaviours between ultrathin surface layer and asphalt mixture layer using modified pull test

Abstract:This research used a modified pull test to characterize the bonding behaviour between ultrathin surface layer and underlying asphalt mixture layer. Epoxy-modified bitumen (EMB)-based surface layer, resin-based surface layer and cement-based surface layer were used to investigate the applicability of the self-designed pull test. These three types of ultrathin surface layers represent ultrathin surface layers with different stiffness values. Finite element method was performed to investigate the function of included circular cut during the specimen preparation. The pull tests were conducted at 0, 10 and 20 °C, under loading speed of 0.025 MPa/s. The test results indicated that the proposed pull test can be used to evaluate the bonding behaviours between ultrathin surface layer and asphalt mixture layer. But it is not suitable to test the adhesive strength at the interface when the interface is not the weakest area. Research results further illustrated that the EMB-based ultrathin surface layer can provide the best adhesive properties.

Keywords:adhesive behaviour, direct tensile strength, pull test, epoxy modified bitumen, thin surface

Yue Xiao (Corresponding Author), Yefei Wang, Shaopeng Wu & Mingwei Yi, Assessment of Bonding Behaviours between Ultrathin Surface Layer and Asphalt Mixture Layer Using Modified Pull Test, Journal of Adhesion Science and Technology, PDF Download, Find it from ScienceDirect. IF=1.091

About Yue

An Associate Professor from State Key Lab of Silicate Materials for Architectures in Wuhan University of Technology, China since January 2014. Received PhD degree in Road and Railway Engineering in 2013 from Delft University of Technology in the Netherlands. His research interests are on asphalt pavement surfacing, road and pavement materials, asphalt pavement design.
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