Strength and behaviour of concrete with partial replacement of cement by hybrid glass powder

Abstract

Glass powders (GPs) with different particle sizes such as 31.57 and#956;m and 7.80 and#956;m were simultaneously used as partial cement replacement in mortar and concrete mixes with varying replacement levels. The physical and chemical properties of the binding materials confirmed the GPs as siliceous, amorphous and fine-powdered pozzolans. An equal proportion of GPs was selected based on the respective median particle sizes of binding materials determined from the particle size analysis. Analyses of the hardened properties in both mortar and concrete produced an increase in compressive strength at 10 % and 30 % hybrid GP substitution respectively. newlineDurability indicators, namely, water absorption, sorption, chloride-ion penetration, drying shrinkage and moisture movement in hybrid GP concrete, and acid attack in GP mortar were verified. Mechanical performance of the hybrid GP concrete specimens exposed to elevated temperatures under both air-cooling and water-cooling regimes were examined. The influence of hybrid GP on the bond strength of concrete-to-concrete interface by slant shear test and bond-slip behaviour by pull-out test on GP concrete were investigated. Experimental investigations were carried out on the structural behaviour of GP concrete elements. newlineThe potential use of hybrid GP mortar/concrete in resisting aggressive environment was established from the durability studies, except a marginal increase in drying shrinkage. The performance of hybrid GP concrete specimens subjected to elevated temperatures resulted in an increase in mechanical strength up to 600 0C than at ambient temperature. Enhanced interface bond strength of the hybrid GP concrete specimens was observed from the slant shear and pull-out tests. Improved strength, mid-span deflection and flexural toughness were demonstrated by the hybrid GP beams than the normal ones, despite a variation existing in the ductility and stiffness values in the case of over-reinforced beams.