Abstract
Hot mix asphalt (HMA) is very common as a highway construction material. Although investment costs are lower than other pavements, HMA needs maintenance and rehabilitation (M&R) more often because of environmental conditions. The time needed for M&R can be extended by using fibers in the mixture. In this study, utility of sisal (Agave Sisalana) plants’ fibers are investigated in HMA. Initially, optimum bitumen content according to best aggregate gradation is determined using Superpave volumetric mix design process. Then, fiber is prepared as short (~3 cm) and long (15 – 100 cm) pieces. Prepared fibers are added into HMA mixtures at different ratios (1, 2 and 3‰ by weight of mixture) based on optimum bitumen content. 1‰ short sisal fiber added specimen gave the best unconditioned indirect tensile strength values, and also long fibers gave best tensile strength ratios.
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