M20 Grade Concrete Subjected to Elevated Temperature

The most widely used structural material in construction is concrete. Various natural disasters such as earthquakes, landslides, floods, cyclones, fire accidents, etc may occur in concrete structures. The major damage that a building may experience fire accidents. Concrete is used for controlling fireproofing. As concrete is exposed to elevated temperatures in a damaged building fire, the structural and non-structural elements of the building may undergo different changes. Depending on the intensity and duration of exposure, it may reach beyond 1000oC in an accidental fire. To replicate the fire exposure on the elements of the building, an experimental program took on in this study to analyse the effect of high temperatures on the concrete specimens of size 150mmx150mmx150mm. These specimens were exposed to temperatures ranging between room temperature to 1000oC for 3 hours duration at an interval of 10mins. M20 grade of 150mmx150mmx150mm concrete cubes are exposed from room temperature to 1000 ° C for 3 hours of fire exposure in every 100 ° C increment. After 3 hours duration cubes were air-cooled to room temperatures and its residual compressive strengths were found out by using Destructive and NDT tests (Rebound hammer and UPV). Thermal gradient variation in concrete from surface to the core at an every increment of 25mm depth was noted by placing thermocouples. The strength results from the destructive testing were substantiate through non-destructive i.e. Rebound hammer and Ultrasonic pulse velocity test. Citation: B Durga Vara Prasad, K Suseela, B Mary Devika. "M20 Grade Concrete Subjected to Elevated Temperature." Global Research and Development Journal For Engineering 6.1 (2020): 12 - 19.