Behavior of bagasse ash-calcium carbide residue stabilized soil with polyester fiber inclusion

Abstract

Bagasse ash is a non-cohesive waste material having small specific gravity that is relatively smaller than that of normal soil, and it behaves as pozzolanic material. Whereas calcium carbide residue (CCR) is hazardous waste materials containing high calcium. Research about using of bagasse ash and CCR is continually in progress. In this paper, a series of experimental studies was undertaken to study the individual and combined effects of randomly oriented polyester fiber inclusions on bagasse ash-CCR stabilized soil. The first step was carried out compaction test on 7, 14, 21, 28 and 36 days-cured soil-mixed with 8% CCR to get optimum curing period that was found at 28 days. Then, the test of soil + 8% CCR + bagasse ash with proportion of 3, 6, 9 and 12% was performed on unconfined compression test to get the best proportion of bagasse ash. That was found 9%. Finally, compaction, direct shear, and unconfined compression tests were performed on 2% fiber inclusion on bagasse ash-CCR stabilized soil (soil + 8% CCR + 9% bagasse ash). Stiffness and maximum dry density (MDD) of soil increase due to additional of CCR, however, it is not significantly affected by the polyester fiber inclusion. Improvement shear strength of stabilized soil is mostly affected by the increase of cohesion rather than due to improvement of internal friction angle. Ductility of bagasse ash-CCR soil mixture increased because of the present of polyester fiber reinforcement.