Shear resistance performance evaluations of rubber asphalt waterproof adhesive layer on bridge deck

Abstract

Shear resistance performance between asphalt concrete surfacing and cement concrete is very important to guarantee the service life of deck paving. Insufficient shear resistance will result in some premature damage, such as cutting-slippage, folding, spalling, and loose. Shear resistance performance of rubber asphalt waterproof-adhesive layer was evaluated with oblique shear experiment under common design high-low temperature condition (20¢C, 50¢C and -10¢C). With the different effect of loading rate and rubber asphalt spraying quality, shear resistance performance was evaluated with indexes such as maximum shear stress ( τ max ), shear resistance energy ( E t ) and ultimate shear deformation ( δ b ). Results show that shear resistance performance of rubber asphalt waterproof adhesive layer under three different temperature conditions are significantly different. Under high temperature: τ max and E t decrease significantly when temperature varies from 20¢C to 50¢C; meanwhile the two indexes are affected by rubber asphalt spraying quality insignificantly; the fundamental factor determining shear resistance ability is interaction ability between rubber asphalt and concrete surface. Under -10¢C: Rubber asphalt waterproof-adhesive layer shows elastic properties; the relationship between shear stress and shear deformation shows general linear; δ b decreases significantly, but shear stress is great enough to improve E t to an increased result. So, the spraying quality and shear resistance ability can be determined and evaluated by the three indexes ( τ max , E t , δ b ) tested by oblique shear experiment.