COMPRESSIVE BEHAVIOUR OF STANDARD CONCRETE AND STEEL FIBRE REINFORCED STANDARD CONCRETE AT HIGH TEMPERATURES

The present study aims at comparing the compressive strengths between standard concrete and steel fibre reinforced standard concrete subjected to high temperatures. The grade of concrete designed for investigation is M30. The fibres used for investigations are hook end steel fibres with aspect ratio 50. The dosage of fibres added was 3% by weight of cement. The specimens of size 150x150x150 mm are cast for testing. The samples are cured for 3, 7, 28 and 56 days. The specimens were air dried and then exposed to 27, 100, 200, 300 and 400°C for duration of one hour and cooled to room temperature and then tested under 2000 kN digital compression testing machine. When exposed to elevated temperatures, standard concrete with steel fibres of 3% by weight of cement performs better than that standard concrete without steel fibres. All the results and observations are analysed and presented in the paper.