Resistance of Mortars Containing Waste Glass Powder as Cementitious Materials Against Sulfuric Acid.

The study examines the impact of WGP on the resistance of mortar to sulfuric acid solution attack, with specimens containing 0%, 5%, 10%, 15%, 20%, 25%, and 30% WGP produced as cement substitutes. Some fundamental properties of mortar mixtures were evaluated, such as the pozzolanic activity index assessment, fresh density, water absorption, and compressive strengths during water curing times. Subsequently, the behavior characteristics of mortars when subjected to sulfuric acid solutions were assessed, including mass loss, residual compressive strength, visual inspection, and microstructure features during eight weeks of immersion in sulfuric acid. The results of the study indicated that the incorporation of WGP led to improved sulfuric acid resistance in the mortar. Furthermore, an increase in WGP content resulted in a reduced reduction in compressive strength against sulfuric acid attacks as the ages progressed. The study revealed that the mortar containing 5% WGP as a cement substitute had the highest compressive strength compared to other specimens, and using 10% WGP as a supplementary cementitious material was comparable to the control mixture. Finally, the microstructure tests indicated that the sample containing 5% WGP had a lower intensity of CH peaks than the reference sample. The study suggests that the optimum amount of GWP for strength and economic parameters is 5%, and 10% substitution, respectively. However, when considering acid solution resistance, 25% GWP cement replacement is the ideal content. [ABSTRACT FROM AUTHOR]