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.
