Laboratory investigation of stone matrix asphalt using bagasse fiber

Abstract

Stone matrix asphalt (SMA) is a gap graded mix which contains a high concentration of coarse aggregate which are held together by a rich matrix of mineral filler, fiber or polymer as stabilizers in a thick asphalt film. SMA uses a structural basis of stone to stone contact in the mix by utilizing high concentration of coarse aggregates and thus provides an efficient network for load distribution. The rich mortar binder provides durability. Cellulose fibers, mineral fibers or polymers are added to SMA mixtures as stabilizing agent to prevent drain downof the mix. These structural characteristics makes SMA to maximize deformation resistance or rutting, provides durability and longevity in the service life of the pavements.
In this project an attempt is being made to study the engineering behavior ofmixtures of stone matrix asphalt with a non-conventional natural waste fiber, namely sugarcane fiber which is a waste product after extraction of juice from sugarcane fiber. To achieve this various samples of SMA mixtures with and without fibers with different binder content were prepared. Marshall Properties were used to determine the optimum binder content .Thereafter other properties such as the drain down characteristics, static indirect tensile strength parameters were determined. The MORTH specifies t addition of only 0.3% fiber, use of which has shown significant improvement in the stability, drain down and indirect tensile strength characteristics to meet the design standards.