A Case Study On Concrete Column Strength Improvement with Different steel fibers and polypropylene fibers

Abstract

High presentation concrete is chiefly cast-off in multistory constructions where it expressively lessening the measurements of columns, which styles it a more economical excellent for building than normal strength concrete. In seismic area, high enactment concrete posses more complications, since it has less ductility in comparison with normal concrete. The purpose of this research is to detect the combined consequence of fibers and ties on the conduct of reinforced columns and to advance their ductility. This study presents an investigational valuation of strength and ductility of ordinary and high presentation concrete short columns limited by tie with and without steel fibers and polypropylene fibers. Five square concrete columns (100×100×1000) mm were established. The variables considered were, concrete strength, volume percentage of longitudinal reinforcement (4.52%), volumetric ratio of lateral reinforcement (spacing between ties) (5.58%) volume fraction of fibers (0.5% and 0.75%), form of fibers (hooked steel fiber and polypropylene) and phase ratio of steel fibers (100) (length 50mm and diameter 0.5mm) and (60) (length 30mm and diameter 0.5mm). The column specimens were tested under axial load. The values presented that the adding of steel fibers (volume friction 0.75% and aspect ratio 100) for high presentation concrete improves the compressive strength, splitting tensile strength, flexural strength, and static modulus of elasticity. Commonly, the effects also exhibited that the adding of fibers to usual and high act concrete upsurges the strength and advances their performance.