INFLUENCE OF TEMPERATURE ON STRENGTH OF CONCRETE

Abstract

Fire represents one of the most severe environmental conditions to which structures may be subjected and, hence, the provision of appropriate fire safety measures for structural members is an important aspect of design. In the present study, the influence of temperature level and time on the mechanical behavior of concrete has been investigated. The concrete mixes of M-35 and M-45 grade are produced. These mixes are used to prepare 48 cubes (100x100x100 mm) and 48 cylinders (150mm diameter and 300mm height). These cubes and cylinders are cured for 28 days. After standard curing period, specimens are dried at room temperature and then the specimens are kept in laboratory for one day before exposing to 300,500 and 800º C for 1 and 3 hours. Then the mechanical properties are determined, which includes: Compressive strength, Split Tensile strength, Loss in Mass, Rebound number and Ultrasonic Pulse Velocity. It is concluded that compressive and split tensile strength of the specimen are r...