experimental study of effect of glass fibres on properties of concrete containing micro-silica and limestone powder

The purpose of this work is to investigate the possibility of using mine wastes in the improvement of concrete properties. this research work investigates the physical and mechanical properties of the concrete specimens. these concrete specimens include concrete-lacking fibres, micro-silica and limestone powder (c), concretecontaining glass fibres without micro-silica and limestone powder (gc), concretecontaining micro-silica and limestone powder without fibres (cml), and concretecontaining glass fibres, micro-silica, and limestone powder (cgml). the physical and mechanical properties including the effective porosity, longitudinal wave velocity, water absorption, unit weight, tensile strength, uniaxial compressive strength, triaxial compressive strength, cohesion, and internal friction angle are investigated. the results obtained show that adding glass fibres to the concrete (gc) improve its properties compared to the fibre-less concrete (c). however, the properties of gc are improved significantly less than cgml. the brazilian tensile strength and uniaxial compressive strength of gc increase by 13.6% and 10.95% relative to c. the brazilian tensile strength and uniaxial compressive strength of cgml increase by 21.8% and 45.94% relative to c. finally, it can be concluded that adding the micro-silica and limestone powder to the glass fibre concrete as well as the use of mine wastes also significantly improves the properties of the concrete.