Influence of Natural Fibers on the Performance of Hot Mix Asphalt for the Wearing Course of Pavement

Omar T.  Mahmood; Sheelan A. Ahmed

doi:10.14500/aro.10710

Omar T. Mahmood Department of Civil Engineering, Faculty of Engineering, Koya University, Daniel Mitterrand Boulevard, Koya KOY45 AB64, Kurdistan Region – F.R. Iraq https://orcid.org/0000-0002-9960-0297
Sheelan A. Ahmed Department of Civil Engineering, Faculty of Engineering, Koya University, Daniel Mitterrand Boulevard, Koya KOY45 AB64, Kurdistan Region – F.R. Iraq http://orcid.org/0000-0003-0081-463X

Keywords: Coconut Fiber, Corn Fiber, Indirect tensile strength, Marshall flow, Marshall stability, Natural fiber, Palm fiber, Sisal fiber

Abstract

Cracking in the flexible pavement is a serious problem that reduces the service life of the roads pavement unless they are treated with great care. Since flexible pavement is very weaker in tension than in compression, it is usually necessary to consider the tensile stresses and some type of additives to improve asphalt
pavement performance, and one of the most effective ways of improving asphalt pavement performance is to reinforce asphalt mixtures by incorporating natural fibers. The main objective of this study is to use palm fiber, which is locally available, in hot mix asphalt mixtures. To achieve this objective, the Marshall test and indirect tensile strength test were conducted on four asphalt mixtures with different types of natural fibers (Coconut, Corn, Palm, and Sisal), added in varying percentages 0.1, 0.2, 0.3, 0.4, and 0.5% and different lengths of fiber 0.5, 1, 1.5, and 2 cm. Based on the analyzed results, it can be concluded that the use of palm fiber increased the Marshall stability by 20% as compared with the conventional mixture and raised up the retained tensile strength ratio up to 92%. Finally, the use of 0.2% content of natural fiber at 1.5 cm length gave a better performance for the mixtures.

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Author Biographies

Omar T. Mahmood, Department of Civil Engineering, Faculty of Engineering, Koya University, Daniel Mitterrand Boulevard, Koya KOY45 AB64, Kurdistan Region – F.R. Iraq

Omar Taha is a Lecturer at the Department of Civil Engineering, Faculty of Engineering, Koya University. He got the B.Sc. degree in Building and Construction Engineering and the M.Sc. degree in Highways and Airports Engineering. His research interests are in pavement materials, traffic engineering, and geometric design of highways.

Sheelan A. Ahmed, Department of Civil Engineering, Faculty of Engineering, Koya University, Daniel Mitterrand Boulevard, Koya KOY45 AB64, Kurdistan Region – F.R. Iraq

Sheelan Abdulwahid is a Lecturer at the Department of Civil Engineering, Faculty of Engineering, Koya University. She got the B.Sc. degree in Civil Engineering and the M.Sc. degree in Transportation Engineering. Her research interests are in pavement materials, traffic engineering, and geometric design of highways.

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