Mechanical properties of unprotected recycled concrete to fiery-hot

Abstract This study examines the performance of concrete by predicting the compression, flexural and split-tensile strength after fire flame exposure. Statistical approaches are taken to find out the fresh and hardened properties of HSC influenced by revelation to the fiery-hot blaze. For different mixes of concrete (Mix 1 with 100% cement, Mix 2 with 20% fly ash and Mix 3 with 10% silica fume) after fire flame exposure, strengths are calculated and after knowing the values for afterburning effect strengths, a mathematical model is proposed. Model is based on the before fire flame exposure strengths to observe the afterwards consequences of fire flame on strengths. Effect of higher temperature on different mixes and density, compressive, tensile and flexural strengths has been observed. The concrete samples were exposed to fire flame heats fluctuating between 27 °C and 850 °C on diverse ages of 30, 60 as well as 90 days. 400, 600 and 850 °C remained three heat intensities selected for disclosure period of 2.0 h. Samples were put through water quenching after burning to provide greatest highest tremor caused by abrupt cool down. The analysis outcomes displayed that as fire flame temperatures enhance the density, compressive, flexural and split-tensile strength reduces.