Properties of concrete contains mixed colour waste recycled glass as sand and cement replacement

Mixed colour waste recycled glass is waste material that cannot be reused in glass industry. Concrete can be considered as an outlet for the surplus quantities of the mixed colour waste recycled glass. This research work studies the feasibility of recycled glass sand (RGS) and pozzolanic glass powder (PGP) in concrete as sand and cement replacement, respectively. Ground granulated blastfurnace slag (GGBS) and metakaolin (MK) were used in this study to replace Portland cement and investigate the effect of RGS on the behaviour and properties of concrete contains blend of different cementitious materials. Severe bleeding and segregation were observed when normal sand was replaced by RGS and the plastic properties of the concrete undergo clear changes. However, the presence of the PGP in concrete enhanced the plastic properties of concrete. No significant differences were observed in compressive strength of concrete with the presence of RGS in concrete, while an average reduction of 16% was occurred when 20% of the Portland cement was replaced by PGP. The effects of utilising waste recycled glass as sand/cement replacement in concrete were further explored by applying different tests such as, tensile splitting strength, flexural strength, static modulus of elasticity and water absorption.