Abstract
Currently, the cost of production of stone mastic asphalt (SMA) is relatively high for paving roads and highways. One means of reducing the cost is to use relatively low cost by-products as aggregates and fillers. The main purpose of this study is to appraise the effect of aging on resilient modulus of SMA incorporating electric arc furnace (EAF) steel slag and copper mine tailing (CMT) as binary industrial waste materials. To achieve this aim, four mix designs consisting of EAF steel slag and CMT at various percentages were investigated. Marshall stability, drain down and indirect tensile resilient modulus tests were conducted. The indirect tensile resilient modulus test was carried out to assess the stiffness of SMA mixture at 25 and 40 °C. Stiffness variation in asphalt mixtures play a vital role in inflicting cracking and rutting in pavement. While some samples were unaged, equal numbers of samples were subjected to short term and long term oven aging. The results show that incorporating EAF steel slag and CMT into SMA mixture has a substantial positive effect on the drain down and resilient modulus of SMA. Thus, the study has contributed to the reuse of economical and environmentally friendly metallurgical and mining by-products in roads and highway industries.
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