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Development and Evaluation of Porous Pavement Surface Mixtures with Bio-based Epoxy Asphalt Binder
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2019-09-30
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[PDF-780.14 KB]
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Edition:10/01/2018 – 09/30/2019
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Abstract:Porous asphalt mixture, as one type of pavement surface materials, is designed intentionally to leave a large interconnected air void system in the mixture. It can be placed on pavement to reduce hydroplaning-related traffic accidents, mitigate heat-island effect, and reduce traffic noise. However, due to its thermoplastic and high porosity nature, porous asphalt mixture generally has low durability in the field. This study aims to improve the durability, strength, and sustainability of porous asphalt mixture by formulating bio-based epoxy asphalt binder (BEAB) and improving its mixture design. In the study, a BEAB formula was firstly developed through a uniform experimental design. Then, the performance of porous asphalt mixture containing BEAB was tested and evaluated along with traditional porous asphalt mixture. Finally, a simple ranking approach was introduced to improve the current mixture design approach. Based on laboratory test results and analysis, the optimum BEAB formula was identified as 7% epoxidized soybean oil (ESBO), 5% maleic anhydride (MA), and 88% base asphalt (PG 67-22). Compared to the base asphalt, the formulated BEAB may improve the strength, durability, and environmental sustainability of porous asphalt mixture without reducing its permeability and cracking resistance. In practice, to achieve balanced pavement performance for water permeability, mixture durability, strength, and cracking resistance, a 4.75-mm nominal maximum aggregate size (NMAS) open gradation with an optimum BEAB content is recommended. The developed BEAB-based porous asphalt mixture would promote the applications of porous as and open-graded friction course (OGFC) in more community health related scenarios.
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