Compressive Behavior of High Strength Concrete Short Columns with Waste Marble Powder as Partial Replacement of Cement and Sand at Elevated Temperature

Abstract

Fire is one of the most dangerous threats to which buildings are exposed. Concrete exposed to high temperatures undergoes significant physical and chemical changes. In order to tackle these threats, researchers have used different materials to prepare a sustainable fire resistance concrete mix. In this study, Waste Marble Powder (WMP) was used in the RCC short columns to improve its fire resistance. This investigation is divided into two phases. In the first phase, 10 % WMP was incorporated in concrete as a replacement of cement. In the second phase, 30% and 50% WMP were used as sand replacement in mortar with plastering of columns. All the samples were tested at unstress residual conditions with targeted temperatures of 200, 400, 600 and 800 ºC at a heating rate of 5 ºC/min. Different properties namely stiffness, ductility, load deformation curve and compressive toughness caused by elevated temperatures exposure, were measured. At increasing temperatures, waste marble powder-modified samples showed higher load carrying capacity, stiffness, and compressive toughness as compared to the control sample. Visual assessment also investigated after high temperature exposure revealed that modified columns exhibited lesser cracks as compared to control columns. On the other hand, the effect of 30 % sand replacement in mortar, load carrying capacity was slightly increased as compared to control sample at elevated temperatures.