Direct shear strength of fiber reinforced self compacting concrete under acid and sulfate attack

This thesis shows an experimental investigation on the shear strength of self-compacting concrete (SCC) reinforced by steel fibres (SF) as well as polypropylene fibres (PPF). Also, the fresh and some other mechanical properties were investigated in three different environmental conditions the air, sulfate (MgSO4 with a concentration of 5%) and acid (H2SO4 with a concentration of 5%). Five different mixtures were created: SCC without fibre as the control mix, SCC with the addition of SF with 0.1% and 0.2% volume fractions and PPF with varying volume fractions of 0.1% and 0.2%. Shear strength, compressive strength and splitting tensile strength were conducted on FRSCC specimens after exposing them to previous environments after 30 days of exposure. For workability, it was concluded that PPF decreased the workability of SCC badly. So special care must be taken when selecting its volume fraction. However, SF slightly affects workability and does not decrease it compared with PPF. It was found that generally shear strength of SCC mixes enhanced with increasing SF and PPF volume fraction. Compression strength did not improve by PPF, but tensile strength achieved some improvements. However, with SF, they significantly improved. It was found that both fibres have some good durability effects, and they resist aggressive environmental conditions.