EFFECT OF STEEL RATIO AND MINERAL ADMIXTURES ON CRUSHING LOAD OF SHORT COLUMNS

K. Chandrika, Ch. Rambabu, T. Chandra Sekhar Rao

Abstract: An experimental study is carried out to investigate the effect of type of lateral reinforcement as a confining material and also the effect of mineral admixtures on compressive strength of concrete in the column composite. For this, the work is carried out in two phases. In the first phase, Short columns were casted by varying volumetric ratio and spacing of lateral reinforcement. The effect of spacing, volumetric ratio on ultimate load carrying capacity of short columns is studied. And in the second phase, Short columns with different types of mineral admixtures like fly ash and GGBS are developed. All the columns were tested in the Universal Testing Machine of 1000 kN capacity. The effect of these admixtures on ultimate load capacity of short columns is studied. Also, modes of failures, crack pattern, stress-strain patterns are also studied in both stages. The test results indicate that with increase in volumetric ratio of steel, the strength and ductility of column increases and the columns in which 20% GGBS is replaced shows high strength. From the modes of failure it is observed that the short columns shows brittle fracture and zone of rupture is observed at top and bottom ends of the columns and this zone of rupture is decreases with the decrease in spacing of ties. The spacing of ties is strongly influencing zone of rupture in all type of columns is observed in this study

Keywords: Short Column, Volumetric Ratio, Fly Ash, GGBS, Mode of Failure.

DOI: https://doi.org/10.15623/ijret.2016.0503051