EFFECT OF TEMPERATURE ON STRENGTH & STRESS-STRAIN RELATIONSHIP FOR THE HIGHER GRADE OF CONCRETE

Abstract

The structural elements subjected to high temperatures lead to significant losses due to the reduction in the strength of the concrete. In this study it is observed that strength reduction occurs in concrete on rising the temperature. For use in fire resistance calculations, the relevant thermal properties of high strength concrete were determined as a function of temperature. A number of compressive & tensile strength tests were conducted to examine the strength variation & stress-strain relationship due to rise in temperature on concrete. Tests were conducted at various temperatures (27 C, 100 C & 200°C) for 1hour. Three types of concrete mix were taken (M30, M40, M50) respectively. The results of a study on the influence of temperature on the compressive & tensile strength of concrete are evaluated. Stress-strain relationships were also studied at different temperature. The variation of temperature on concrete samples shows changes in various properties of concrete. The behaviour of concrete in fire is not well defined at present, and further research is required. The response of concrete material to heating is fundamentally complex.