Abstract
Semi-flexible pavement (SFP) is known as a pavement with a high rutting resistance and a considerable load-bearing capacity. Despite its advantages, it is vulnerable to thermal cracking due to the difference in the stiffness properties of SFP components, including cement mortar and porous asphalt. This study aims at improving the overall performance of SFP, most notably cracking resistance, through approximating the stiffness of its constituent materials to each other. To reduce the stiffness of cement mortar, a cement mortar containing rubber powder was modified with nano-silica. The Ethylene Vinyl Acetate (EVA) modified bitumen was employed to increase the porous asphalt stiffness. Modified rubber mortar was poured into the modified porous asphalt mixture to produce the modified SFP (MSFP). The performance of MSFP was compared to conventional SFP (CSFP) using performance-based test methods of low-temperature bending, four-point bending fatigue, and rutting. The results showed that the low-temperature bending strength and strain improved up to 38 and 43%, respectively, for MSFP compared to CSFP. Moreover, the fatigue life and rutting resistance of MSFP were greatly superior to CSFP.
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