Use of Plastic Fibers in Concrete with Partial Replacement of Sand with Fly Ash

Abstract

Abstract: The concrete is a brittle material with high compressive strength but less tensile strength, thus addition of plastic fibers has resulted in better enhancement of compressive strength and better crack control with addition of Fly Ash proving to be precise replacement of Sand by partial means. The values of 1% Plastic Fiber and 20% Fly Ash has helped in obtaining considerable results. Cube specimens of 150*150*150 MM with Values Of 0%,1%,2% And 2.5% Plastic Fibers by weight of cement and Values of 0%,20%,40%,50% Fly Ash were replaced by weight of sand and were casted. At higher values of Addition significant changes in slump values have been noticed, with slump values falling to as low as less than 80 mm, but at low addition of values of plastic fiber and fly ash i.e. till 2% plastic fibers and 40% fly ash it has been observed that concrete is workable with slump values ranging from 80-110 mm.The concrete used for this research purpose was design mix of compressive strength of 30 N/mm2 with a target mean strength of 37.5 N/mm2 at 28 days of curing. The main reason ofstudy was to see whetherthere is any enhancement of compressive strength, crack control for impacts and shrinkages with proper utilisation of Plastic fibers and Fly Ash in concrete. Keywords: Concrete, Plastic Fiber, Fly Ash, Compressive Strength, Crack Control