Use of Jute Fibre in Stone Matrix Asphalt

Abstract

ABSTRACT Synthetic fibres are conventionally used in the construction of Stone Matrix Asphalt (SMA) in bituminous pavements. The synthetic fibres are not manufactured in India and are imported at a higher cost. As an alternative to synthetic fibre, coated jute fibres were used and its properties were studied. The paper presents details of the laboratory investigations carried out to determine the feasibility of use of natural fibre vis-a-vis synthetic fibre in bituminous gap graded mix. The performance of these mix were evaluated by conducting moisture susceptibility test, rutting test, accumulated strain and creep modulus and stiffness modulus. The test results indicated that the natural jute fibre can replace synthetic fibres in SMA mixture. A slightly higher accumulated strain and subsequently slightly lower creep modulus were observed as compared to SMA with synthetic fibre at 40°C and 50°C temperatures. However, Hamburg wheel test results indicated that permanent deformation is same in both fibres. The stiffness modulus of the SMA with natural fibre is slightly lower as compared to SMA with synthetic fibre at 25°C and 35°C temperatures. The tensile strength ratio for both mixes is more than the prescribed limits. However, the construction cost of the SMA with natural fibre per metric ton is comparatively lower.