Mix Design and Selection of Stone Mastic Asphalt Incorporating Steel Slag and Coconut Fiber

DOI: https://doi.org/10.55228/JTST150205

Keywords

Stone Mastic Asphalt, Steel Slag, Coconut Fiber, Drain-down, Marshall stabilily

Abstract

Stone mastic asphalt (SMA) mixtures are highly regarded for their ability to withstand heavy traffic loads, good rutting resistance, and provide long-term durability. In the context of the growing demand for sustainable construction materials, steel slag—an industrial by-product—has been considered a promising alternative to conventional aggregates in SMA production. This study focuses on the design and comparison of three SMA 16 mixture gradations incorporating steel slag as aggregate and coconut fiber as a stabilizing additive. The evaluated performance indicators include draindown, volumetric properties (air voids, voids in mineral aggregate, and voids filled with asphalt), as well as Marshall stability. The results reveal clear differences among the three gradations in terms of draindown behavior and mechanical characteristics. On the basis of a comprehensive analysis of the technical indicators in accordance with standard requirements, this paper initially recommends the SMA 16 mixture using steel slag and coconut fiber as a suitable option in terms of strength and pavement stability

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