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

• Main Authors: Abdul Hamid, N.H (Author), Abdul Hassan, N. (Author), Huang Y.F (Author), Leong K.H (Author), Ling L. (Author), Marie Delbrel, E.J (Author), Mohammed, A.A (Author), Putra Jaya, R. (Author), Ramli, N.I (Author), Tan K.W (Author), Ti Kok, S. (Author), Wee Kang, C. (Author), Yaacob, H. (Author)
• Format: Article
• Language: English
• Published: EDP Sciences 2018
• Subjects: Ageing conditions; Asphalt mixtures; C (programming language); Environmental engineering; Experimental program; Fibers; Indirect tensile test; Long term ageing; Mixtures; Modified asphalts; Repeated loads; Rut resistance; Stiffness; Stiffness moduli; Tensile testing
• Online Access: View Fulltext in Publisher; View in Scopus
• ISBN: 22671242 (ISSN)
• DOI: 10.1051/e3sconf/20186502003

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. © The Authors, published by EDP Sciences, 2018.