They found that the Schmidt hardness, as well as the compressive, tensile and flexural strengths, were slightly reduced with the increase in the glass aggregate. Topçu and Canbaz reported that glass aggregate has no significant effect on the workability of concrete. Furthermore, the use of a glass coarse aggregate will reduce the use of natural coarse aggregate, saving natural resources. Therefore, the utilization of crushed waste glass as a coarse aggregate in concrete can significantly increase its usage, and thus, help save the land needed for its storage. However, the mechanical and durability properties of OPC and geopolymer concrete containing 10 to 20% glass coarse aggregate were comparable to the corresponding properties of the control concrete sample containing a natural coarse aggregate.Ĭoarse aggregate is the one of key components of concrete, which comprises a high volume of concrete products. The microstructural analysis revealed the porous interfacial transition zone (ITZ) between the glass coarse aggregate and the paste/mortar matrix led to a decrease in the strength and an increase in the porosity, sorptivity and chloride permeability of the concrete due to the increase in the glass coarse aggregate. The porosity, sorptivity and chloride permeability of OPC and geopolymer concrete increased and the drying shrinkage decreased due to the use of the recycled glass coarse aggregate. It was found that the 28-day compressive and tensile strengths of OPC concrete decreased up to 21%, and 7% and of geopolymer concrete decreased by 11–26% and 11–29% with the increase in the recycled glass coarse aggregate.

This study investigated the characteristics of ordinary Portland cement (OPC) and geopolymer concretes containing different proportions of recycled glass as a partial replacement of natural coarse aggregate. The use of recycled glass as aggregates in concrete is one of the many options for recycling. A significant amount of waste glass is generated in Australia and around the world, which requires sustainable recycling.

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