The combined effect of GGBS and low volumefibres on the low-velocity impact and mechanical properties of self-compacting concrete

Abstract

The primary objective of the current investigation is to evaluate the low-velocity impact behaviour and mechanical properties of low volume fibres reinforced self-compacting concrete made with 30% GGBS as a replacement of cement with a water powder ratio of 0.3. The steel, basalt and glass fibres of length 22 and 30 mm with low volume fractions of 0.25, 0.5 and 0.75% are used for this investigation. The self-compatibility of concrete is confirmed by testing the slump flow test. The addition of fibers reinforced in the concrete decreases flow as compared without fibers reinforced conrete, flow value decreased in basalt and glass as compare to steel fiber reinforced concrete. The compressive, flexural, split tensile strength and low-velocity impact resistance, shear strength were conducted after 28 days of water curing. The experimental results show that the compressive strength is only a marginal strength improvement was observed in the steel fibre reinforce self-compacting concrete mixes. The high tensile, flexural, shear strength were observed in 30% replacement of GGBS with 0.75% of steel fibres of 30 mm length. The results of the experiments express that incorporation ratio of steel fibre reinforced concrete improves the strength, remarkably tensile, flexural and shear strength as compared with the control and other fibers reinforced concrete. A significant improvement was observed in impact energy of steel fibrous reinforced concretes as compared with the control mix of self compacting concrete. The results demonstrate that use of steel fiber is reinforced in the self compacting conrete including ground granulated blast furnance slag, the impact energy and the ductility characterstics of the self compacting fiber reinforced concrete are noticeably increased.