Abstract
With regard to the construction of high speed railways, the role of cement emulsified asphalt mortar (CEAM) is of crucial importance as a leveling and damping material. In this respect, there are many research studies on exploring the mechanical, durability, fatigue, and rheological characteristics of CEAM. Nonetheless, developing greener types of CEAMs would be of great interest for developing transportation infrastructures with low carbon footprint. Accordingly, the current study aims to evaluate the effects of partial replacement of cement with low pozzolanic activity ground granulated blast furnace slag (GGBFS) and silica fume (SF) on mechanical and fatigue performances of CEAM. In addition, a central composite design (CCD) with response surface methodology (RSM) was applied to the results to develop statistical models.The results obtained reveal that utilizing low pozzolanic activity GGBFS showed no significant effect on uniaxial compressive strength (UCS) and decreased the indirect tensile strength (IDT) slightly. Moreover, both UCS and IDT heightened through the inclusion of SF. As a result, the addition of SF would compensate for reduction in some mechanical properties caused by GGBFS with low pozzolanicity. Furthermore, based on the results, semi-circular bending (SCB) test properly differentiated the effects of cement replacement with GGBFS and SF on fatigue resistance of CEAM.
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