Evaluation of mixing procedure effects on draindown in stone mastic asphalt using steel slag and coconut fiber

DOI: https://doi.org/10.55228/JTST150303

Keywords

Stone Mastic Asphalt, Drain-down, Steel Slag, Coconut Fiber, Mixing procedure

Abstract

Stone mastic asphalt (SMA) exhibits high rutting resistance and durability; however, it is prone to binder draindown due to its high asphalt content. This study aims to evaluate the effect of mixing production procedures on the draindown of SMA using steel slag and coconut fiber. The research was conducted in two steps: first, different coconut fiber addition methods for SMA with stone aggregates were evaluated, and an appropriate procedure was selected based on draindown test results; subsequently, the production procedure for SMA using steel slag was adjusted and evaluated in comparison with the conventional SMA production procedure using crushed stone aggregates and cellulose fiber in accordance with TCCS 36:2021/TCĐBVN. The study results indicate that increasing the aggregate heating temperature by approximately 10 °C, extending the mixing time by an additional 30 seconds, and introducing coconut fiber using the dry-mixing method together with mineral filler during asphalt binder addition help to mitigate asphalt drain-down and improve Marshall stability as well as the volumetric properties of SMA. The findings contribute to the proposal of a suitable production procedure for SMA using steel slag and coconut fiber under practical production and construction conditions

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