Influence of waste glass powder as a supplementary cementitious material (SCM) on physical and mechanical properties of cement paste under high temperatures

Supplementary cementitious materials (SCMs) have attracted increasing research interests due to the energy-intensive process and high greenhouse gases emissions of conventional cement. Meanwhile, large amounts of domestic wastes such as waste glass are causing serious environmental issues due to their nonbiodegradable characteristic. Thus, recycling waste glass is a sustainable way to mitigate the environmental problem, conserve natural materials, minimize landfill spaces, and save energy during the recycling production process. This paper experimentally studied the effect of using waste glass powder (WGP) as an ordinary Portland cement (OPC) supplementary material on the paste specimens at ambient temperature and after exposure to high temperatures (800 °C, 1000 °C, and 1200 °C). The physical-mechanical properties such as workability, setting time, compressive strength, and bonding strength of the OPC paste samples containing different mass contents of WGP (0%, 10%, 20%, and 30%) were investigated and discussed. The potential alkaline aggregate reaction (ASR) effect of WGP on OPC was investigated by the accelerated mortar-bar method. The results show that the addition of WGP contributed to the workability but led to prolonged setting time of the OPC paste. On the other hand, the introduction of WGP in OPC mitigated the degradation of the OPC matrix under high temperatures and could reduce the ASR effect. Therefore, the WGP could be regarded as a feasible SCM to OPC to improve the safety of OPC-based structures both at ambient and under high temperatures.