ISSN: 2734-9438
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Analysis of the effect of steel slag content used as aggregate on the quality of hot mix asphalt
Abstract
This paper presents an experimental study on the effect of steel slag content as a replacement for crushed stone on the engineering properties of hot mix asphalt (HMA). Steel slag was used to replace coarse aggregate at replacement levels of 0%, 30%, 50%, 70%, and 100% by weight, and the mixtures were evaluated using the Marshall method. The results indicate that the optimum asphalt content increases with higher steel slag replacement due to its rough surface texture and higher asphalt absorption capacity. Marshall stability increases, whereas Marshall flow decreases as the steel slag content increases, indicating enhanced stiffness and load-bearing capacity. Furthermore, owing to the higher specific gravity of steel slag, mixtures containing steel slag exhibit greater bulk density compared to conventional asphalt mixtures.
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