Effect of steel fibre on fracture toughness of concrete

Abstract

The project focuses on fracture toughness of steel fibre reinforced concrete. M30 grade concrete is used in this project. 5%0.10%, 15%,20%, 25% and 30% of Ground Granulated Blast Furnace Slag (GGBFS) is replaced with cement. The hooked end steel fibre addition is kept constant as 3% by weight of binder content. 5%, 10%, 15%, 20%, 25%, and 30% of foundry sand is replaced with fine aggregate. Specimens of size 500 × 50 × 50 mm are used with notch of constant width 3 mm with notch depth ratios of 0.1, 0.2, 0.3, and 0.4. The fracture toughness is determined by using three-point bending test. The results are compared with the results of ordinary concrete mix.