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

• Main Authors: Delbrel, EJM (Author), Hamid, NHA (Author), Hassan, NA (Author), Jaya, RP (Author), Kang, CW (Author), Kok, ST (Author), Mohammed, AA (Author), Ramli, NI (Author), Yaacob, H (Author)
• Format: Article
• Language: English
• Published: 2018
• Subjects: COCONUT SHELL
• Online Access: View Fulltext in Publisher

 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 degrees C and repeated load axial test at 40 degrees C. The results showed that the fibres improved the mixture's performance. The main findings obtained at 25 degrees 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.