Performance of Concrete at Elevated Temperatures

Abstract

Fire accidents are common in buildings due to several reasons and also Aircraft pavements are also exposed to high temperatures during takeoff and landing of Aircrafts and also, they are exposed to high temperatures during summer. Hence it is necessary to know the behaviour of concrete at elevated temperatures. This study presents the experimental results of the effect of temperature on the strength in compression of M45 grade concrete. A total of 42 cubes were cast, with mix proportions of 1:1.69: 2.626 cement: fine aggregate: coarse aggregate and 0.43 as water cement ratio for these investigations. The specimens are removed from moulds kept for curing in water for age of 7 and 28 days. At desired age, the specimens are removed from curing tank and exposed to various temperatures for 1 hour duration and tested in compression at room and elevated temperatures of 27, 50 to 300°C at intervals of 50°C. The results have revealed that the strength has been increased with in increase in temperature up to 250°C and decreased at 300°C.