Effects of Aggregate Gradations on the Performance of Open Graded Friction Course (OGFC) Mixtures
Publication: International Conference on Transportation and Development 2021
ABSTRACT
The open graded friction course (OGFC) is a type of porous pavement that has been used as a surface layer to improve riding quality and safety, mainly in wet conditions. In contrast to having some benefits, it also exhibits poor durability and strength-related issues due to its higher air voids. Currently, there are different aggregate gradations being used by different states. The objective of this study is to investigate the effects of different aggregate gradations on the performance of OGFC mixtures. Two different aggregate gradations with two different nominal maximum aggregate sizes (NMASs) were used in this study: NMAS-12.5 with 12.5 mm NMAS aggregate and NMAS-9.5 with 9.5 mm NMAS aggregate. The permeability, stripping potential, and durability performances of both mixtures were examined and compared with each other. It is found that the NMAS-12.5 mixture is more permeable than the NMAS-9.5 mixture. On the other hand, the indirect tensile strength of NMAS-9.5 is slightly higher than the NMAS-12.5. Similarly, abrasion loss for the NMAS-9.5 mixture is relatively low compared to the NMAS-12.5 mixture.
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International Conference on Transportation and Development 2021
Pages: 274 - 280
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© 2021 American Society of Civil Engineers.
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Published online: Jun 4, 2021
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