Abstract
This study aimed to evaluate the possibility of reducing the thickness of asphalt layer as a novel solution for the high density of asphalt layer incorporated with steel slag aggregate, which increase the cost of transportation. Mechanistic-Empirical Pavement Design (MEPDG) approach was employed to evaluate the benefits of introducing polyvinyl alcohol fiber in terms of reducing the thickness of asphalt layer as well as the extension service life of asphalt layer. On the other hand, the correlation between creep strain slope (CSS) and secant creep stiffness modulus (SCSM) were assessed to provide a better evaluation and understanding concerning of the outputs of the dynamic creep test. The findings of this study showed that introducing polyvinyl alcohol fiber into the mixtures at the optimum content (0.5 kg/ton) have reduced the thickness of asphalt layer by approximately 10%. Additionally, polyvinyl alcohol fiber has increased the performance of the asphalt mixtures concerning of resilient modulus and dynamic creep. Furthermore, the correlation between CSS and SCSM was strong, which indicates that evaluation of permanent deformation using CSS and SCSM parameters provides better actual assessment than accumulation strain.
Highlights
Asphalt mixture is a composite material containing coarse and fine aggregate, filler, and bitumen [1]
Two types of aggregate were used in this study; Electric Arc Furnace (EAF) steel slag aggregate obtained from NSL, Singapore and crushed granite aggregate supplied by Hanson quarry located in Batu Pahat, Johor, Malaysia
This study aimed to evaluate the asphalt mixture containing coarse steel slag aggregate in regard to the resilient modulus and permanent deformation
Summary
Asphalt mixture is a composite material containing coarse and fine aggregate, filler, and bitumen [1]. Several studies have evaluated the utilization of steel slag aggregate in the asphalt mixtures as a partial or total replacement to the natural aggregate Based on their finding, replacing the natural coarse aggregate by steel slag (EAF) exhibited better performances in contrast to control asphalt mixtures that containing 100% of the natural aggregate in connection with resilient modulus, dynamic creep, cracking resistance, fatigue resistance and moisture susceptibility. Adding fibers to asphalt mixtures may reduce asphalt layer thickness and increase the services life of pavement, minimizing transportation cost of the material, for the materials that have a high density, as well as reducing the demand for the natural aggregate [2123]. Introducing fiber into asphalt mixtures that containing steel slag aggregate may reduce transportation costs as well as provide high performances of asphalt mixture, with regard to the resistance of cracking that developed at the bottom of the surface layer (wearing layer) due to the applied stress by vehicles. The higher asphalt mixture performance, the higher service life of asphalt layer [24]
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