Influence of Elevated Temperature on Various Grades of High Performance Concrete, Containing Artificial Sand and Pozzolanic Admixtures

Abstract

The authors had investigated effect of elevated temperature on durability property of high performance concrete (HPC) produced using 100 % artificial sand as fine aggregate. Many researchers were carried out the research on effect of elevated temperature on various grades of normal concrete, produced using natural sand or partially replaced natural sand. As there is growing tendency of long and heavy constructions, and less availability of natural sand in market, use of high performance concrete (HPC) with some other fine aggregate, is a present need in construction industry. In this study, investigation was carried out on HPC of M 65, M 75 and M 85 concrete grades. These mixes were produced using 100% artificial sand, microsilica & fly ash, as pozzolanic admixtures. The concrete mixes were made as per IS 10262- 2019. After proper curing, it was subjected to elevated temperature ranging from 270C to 7000C for 2 hours soaking period. It was observed that, concrete was sustained without damage up to 3000c elevated temperature. Also, from microstructure investigation, it was observed that, after 5000c temperature, micro cracks were started to develop .and decreases content of C-S-H matrix in concrete. Compressive strength was decreased with increasing content of fly ash. From this investigation, authors concluded that, HPC was sustaining permissible compressive strength up to 3000C elevated temperature.