Durability of Waste Glass Fine Aggregates in Cement Composites

The disposal of Waste Glass (WG) in landfills is a critical environmental challenge faced by most countries around the world. Therefore, reusing of crushed glass as aggregates reduces the utilization of natural resources, thereby minimizing greenhouse gas emissions and increasing the sustainability of natural aggregates. Although it has a near to zero water absorption, enhanced dimensional stability and reduced drying shrinkage, crushed waste glass aggregates have limited use in cement-based applications due to its severe alkali- silica reaction (ASR) proclivity. This paper presents effective ways of incorporating waste glass aggregates in cementitious systems as a partial replacement of fine aggregates. This study explores the use of different combinations of Calcium Aluminate Cement (CAC), Ordinary Portland Cement (OPC) and Ground Granulated Blast Furnace Slag (GGBS) as an optimal matrix for reduced interaction between silica and the alkaline cement paste. Results showed a steady increase in the compressive strength of mortar mixtures incorporating 15% waste glass as a fine aggregate replacementmaterial, and varying percentages of CAC, GGBS and OPC as binder. Furthermore, the paper evaluates the ASR performance of glass incorporated CAC, OPC and GGBS mixtures.