Tensile Behaviour of Concrete with Steel Fibers Subjected To High Temperatures

Abstract

The present study aims at comparing the split tensile and flexural strengths of plain concrete and steel fibre reinforced 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 150 mm diameter and 300 mm length cylinders and 100 x 100 x 500 mm prisms are cast for testing. The samples are cured for 3, 7, 28 and 56 days. The specimens are 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 the cylinders are tested under 2000 kN digital compression testing machine and the prisms are tested under 1000 kN digital universal testing machine. When exposed to elevated temperatures, standard concrete with steel fibres performs better than the plain concrete without steel fibres. All the results and observations are analysed and presented in the paper.