Thermal properties of cement mortar modified with waste glass powder

The aim of this study is to investigate the effects of high temperatures on cement mortars that incorporate various amounts of waste glass powder (WGP) as a cementitious material. WGP is used as a partial replacement for cement in mortars that are exposed to high temperatures. Cement mortar and paste tests were carried out following a 28-day water curing period for samples that contained 0%, 5%, 10%, 15%, 20%, 25%, and 30% WGP as substitutes for cement. Additionally, the samples were exposed to high temperatures of 200˚C, 400˚C, 600˚C, and 800˚C. The characteristics that are assessed include compressive strength, mass loss, porosity, dry bulk density, setting time, and scanning electron microscopy (SEM) to look into the microstructure of cement paste samples. The findings show that cement mortars that incorporate 5% WGP as a substitute for cement have higher compressive strengths than control samples. Moreover, the incorporation of WGP as supplementary cementitious material consistently proves effective in bolstering resistance against elevated temperatures. To simplify, specimens containing WGP showcase a notable maintenance or improvement in compressive strengths when compared to the control sample. The compressive strengths of specimens with WGP replacement from 0 to 30% of cement at 200 °C showed improvements of 12%, 8%, 1%, 18%, 26%, 28%, and 30%, respectively, compared to the strength at ambient temperature.