Assessing the Mechanical Properties of Open-Graded Asphalt Mixtures
Received: 20 November 2024 | Revised: 3 December 2024 | Accepted: 19 December 2024 | Online: 28 December 2024
Corresponding author: Sady A. Tayh
Abstract
In consideration of the escalating vehicular intensity and the substandard material properties of pavements in Iraq, particularly with regard to their impact on wet-weather accident rates and noise pollution in urban areas, there is an urgent need for an analysis of Open-Graded Asphalt (OGA) mixes to address the environmental and safety concerns. While OGA mixtures offer the dual advantages of reducing stormwater runoff and enhancing wet skid resistance, they are also more prone to raveling due to their high porosity. To enhance the performance of OGA mixes, various methods have been employed, including the incorporation of recycled polymers. The primary objective of this research is to evaluate the durability and strength properties of OGA mixes through laboratory testing using the Recycled Polyvinyl Chloride (RPVC) polymer. Laboratory tests were conducted on OGA mixes to ascertain the Marshall stability, resistance to abrasion, permeability, tensile strength, and moisture-induced damage. The mix designs were executed in accordance with the design procedure proposed by the National Cooperative Highway Research Program (NCHRP) for a range of 5.5%–7.0% asphalt content. RPVC was used in various proportions (2%, 4%, 6%, and 8%) by the weight of the base binder. The experimental findings demonstrated that the incorporation of RPVC led to enhanced Marshall stability and Indirect Tensile Strength (ITS) in porous asphalt concrete, surpassing the performance of conventional asphalt mixes. Additionally, the OGA mixture exhibited significant improvements in raveling resistance and moisture susceptibility. The study concluded that the Optimal Binder Content (OBC) of RPVC could enhance the pertinent engineering properties of OGA mixtures without compromising their permeability.
Keywords:
open-grade friction course, fibers, porous asphalt concrete, recycled polymer, permeability, indirect tensile strengthDownloads
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Copyright (c) 2024 Sady A. Tayh, Nidaa Adil Jasim, Shams Ali Ahmed
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