Abstract
Sisal fibre is a natural fibre, which runs along the length of sisal leaves, extraction of which yields fibre. These fibres, which are spared from decomposition, may find significant application in pavement engineering. In this study, an attempt has been made to evaluate the application of sisal fibres in improving the behaviour of bituminous mixes. The effects of addition of four different lengths (5, 10, 15 and 20mm) with four different dosages (0.05, 0.1, 0.2 and 0.3% by weight of aggregate) on stability, flow and air voids in the bituminous concrete mixes were investigated. The optimum bitumen content was obtained for different combinations. To arrive at the optimal dosage of fibre and length, laboratory performance tests such as stiffness modulus, fatigue life and moisture sensitivity were carried out for all the combinations. The fibre length of 15mm at 0.05% dosage by weight of aggregate with an optimum bitumen content of 5.4% by weight of mix was seen to provide better performance.
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