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Steel slag is a by-product of steel making. According to statistics released (2017) by the Department of Natural Resources and Environment, Ba Ria – Vung Tau province has 6 operating steel factories with a total capacity of 4.5 million tons /year and the amount of steel slag that was produced about 10%, has been landfilling and causing negative effects against the environment. In this study, the grain size distribution of steel slag is corrected by mixing with fine sand to make steel slag-fine sand aggregate (the ratio of mixing is 80% steel slag and 20% fine sand), then it was treated with portland cement. The characteristics of this aggregate such as compressive strength, splitting tensile strength and elastic modulus in 7, 14, 28 and 56 days age are determined for evaluation using the cement treated steel slag-fine sand aggregate in pavement. The results show that the technical specifications of cement treated steel slag-fine sand aggregate are improved efficiency, it can be used for road base when treated by 6-8% cement.

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