Authors: Asmaa Abdulmajeed Mamhusseini1 & Bako Bakr Hasan2 & Rahel Zahir Ali3 & Karzan Mahmood Hasan4
1Civil Engineering Department, Faculty of Engineering, Tishk International University, Erbil, Iraq
2Independent Researcher, Erbil, Iraq
3Independent Researcher, Erbil, Iraq
4Independent Researcher, Erbil, Iraq
Abstract: The huge number of industrial wastes has increased rapidly in Iraq. Discarding these wastes become a very serious problem. As a result, an enormous part of the land is being set for the disposal of these advantageous wastes. Steel slag is a by-product material in the industrial area and can be used as an additive in the asphalt mixture modification. Improving slag utilization is an important way to resolve these problems. This study evaluates the use of steel slag as additional replacement material in the production of hot mix asphalt (HMA) for road construction. There are two methods used to add steel slag to bituminous mixes: the wet and dry method. The main purpose is to find the ideal steel slag ratio for the mix using the dry process. Optimum Binder Content (OBC) was found for the mix using the Marshall Mix design. A sequence of samples was prepared with different percentages of steel slag comparing with conventional samples which were 0, 10, 20 and 30% by the total weight of bitumen. For each sample aggregate, asphalt and Marshall mix design tests were conducted and investigated. The results gained from mix design for optimum binder and steel slag ratio, based on average maximum stability, density, and air void for 4%, were found to be 4.8% and 29.5% respectively. Comparing with conventional samples, the empirical analysis of the results indicated that with increasing doses of steel slag, stability and density will increase while keeping air void in the range. Adequate stability needed for ensuring resistance to deformation under dynamic or repeated loads, in another meaning, more stability leads to more strength of asphalt concrete and rutting resistance. Also, durability for the mixture should have sufficient air voids not to hasten aging process.
Keywords: Steel Slag, Hot Mix Asphalt (HMA), Optimum Binder Content (OBC), Marshall Mix Design, Dry Process
Published: August 16, 2022
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