Abstract
The interface bonding between Portland cement concrete (PCC) pavement and hot-mix asphalt (HMA) overlay plays an important role in the performance of the composite pavement. This research conducted a series of comprehensive laboratory studies to investigate the influence factors of the interface bonding strength using a self-designed direct shear test apparatus that can simultaneously apply normal stress and shear stress on a specimen. Four kinds of commonly used tack coat materials were systematically tested and compared under various combinations of normal stress and temperature. Then, coupling effects of the normal stress and temperature on the interface bonding between PCC and HMA were analyzed. The test results show that temperature has a significant impact on the adhesion of the tack coat. Emulsified asphalt was considered the optimal tack coat material because of its simple construction method. In addition, it was found that a damaged interface could still provide considerable bonding strength. Normal stress generated by traffic loads was beneficial to the interface bonding strength, especially at lower temperatures. The temperature had a significant effect on interface bonding and played a leading role in the failure mode of interface bonding.
Highlights
Introduction e interface bonding betweenPortland cement concrete (PCC) pavement and hot-mix asphalt (HMA) overlay is widely recognized as one of the most critical influence factors on mechanical responses of composite pavement as well as its long-term performance [1,2,3]
The shear strength, interface bonding coefficient (IBC), residual strength, and residual ratio were calculated based on laboratory test results
Both analysis of variance (ANOVA) and data analysis were employed to figure out the significant influence factors and internal mechanism of interface bonding between HMA overlay and PCC pavement
Summary
Introduction e interface bonding betweenPortland cement concrete (PCC) pavement and hot-mix asphalt (HMA) overlay is widely recognized as one of the most critical influence factors on mechanical responses of composite pavement as well as its long-term performance [1,2,3]. Most studies have focused on the influence factors of interface bonding and experimental test methods or equipment. These studies have not been widely accepted by researchers and engineers due to lack of sufficient supporting data [11,12,13,14]. In the past few decades, many equipment and methods have been developed for studying the interface boding, including direct shear test, pull-off test, and torsional shear test [15, 16]. Uzan et al [11] designed a direct shear box that can apply both normal and shear loads on the interface of the double-layered prismatic specimen to measure the stiffness K under different test conditions. Arulrajah et al [21] evaluated the interface shear strength through a large-scaled direct shear apparatus
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