The study emphasis the effect of elevated temperature on concrete cubes made with M20, M25, and M30 concrete grades. The other variables considered were temperature (100, 200, 400, and 600 °C), duration of exposure (1-h and 2-h) and two types of cooling methods. The mass loss is varied from 0.52 to 6.56% for various temperature and duration of exposure. The mass loss increases as the duration of exposure increased. The porosity ranges from 9.89 to 44.34% and it depends on grade of concrete and exposed temperature. The strength loss ranges from 3% at 200 °C to 57% at 600 °C for air cooled specimen. In quench cooled specimen the loss in strength varies gradually up to 200 °C but at 400 °C the loss in strength was 42%, while the loss was only 32% for air cooled specimen. The obtained residual compressive strength curve from this study was compared with strength curves proposed by various codes.
M. K. Haridharan, Natarajan, C., and Chen, S. - E., “Evaluation of residual strength and durability aspect of concrete cube exposed to elevated temperature”, Journal of Sustainable Cement-Based Materials, vol. 6, pp. 231-253, 2017.