Stiffness Modulus of Asphaltic Concrete Incorporating Coir Fibre and Subjected to Aging

• Main Authors: Abdullahi Ali, Mohammed, Putra Jaya, Ramadhansyah, Etienne, Joseph Marie Delbrel, Choong, Wee Kang, Sien, Ti Kok, Haryati, Yaacob, Norhidayah, Abdul Hassan, Nor Hayati, Abdul Hamid, Noram Irwan, Ramli
• Format: Conference or Workshop Item
• Language: English
• Published: EDP Sciences 2018
• Subjects: TE Highway engineering. Roads and pavements
• Online Access: http://umpir.ump.edu.my/id/eprint/22986/1/Stiffness%20Modulus%20of%20Asphaltic%20Concrete%20Incorporating%20Coir%20Fibre%20and%20Subjected%20to%20Aging.pdf; http://umpir.ump.edu.my/id/eprint/22986/; https://doi.org/10.1051/e3sconf/20186502003
• Institution: Universiti Malaysia Pahang

The aim of this paper is to investigate the performance response of a set of coir fibre modified asphalt samples subjected different ageing conditions and containing three different fibre contents. The laboratory experimental programs are indirect tensile test at 25°C and repeated load axial test at 40°C. The results showed that the fibres improved the mixture’s performance. The main findings obtained at 25°C for short and long-term ageing reveal that low fibre content at around 0.3% per aggregate weight display a stiffness modulus up to 14% higher than that of unmodified mixtures, hence showing that fibres may improve the bearing capacity and rut-resistance of asphalt mixtures. Conversely, as the amount of fibre increases to 0.5% and 0.7%, the stiffness decreases to the point of becoming unacceptably low, almost 80% lower than unmodified mixes stiffness. However the data also reveal that high fibre contents at 0.5% and above completely neutralize the impact of ageing on the mixture, indicating that fibre-modified mixtures would yield longer lives.