Durability analysis and optimization of a binary system of waste cement concrete and glass-based geopolymer mortar

Enormous generation of construction and demolition (C&D) waste along with municipal solid waste (MSW) is required to managed properly for developing a sustainable environment. In this study, waste cement concrete (WCC) from the C&D waste group and glass waste (GW) from the MSW group is considered as a precursor for preparation of binary geopolymer mixture. The alkali solution used for alkalination is the mixture of sodium hydroxide (10 M) and sodium silicate at a ratio of 2.5. WCC is replaced by GW up to 50% with a 10% interval. Results indicate that the inclusion of GW enhances both mechanical and durability properties with an optimum dosage of 20% GW content. Specimens with 20% GW content reported the lowest mass loss of 2.22% and 4.28% when exposed to 5% hydrochloric and 5% sulfuric acid, respectively for 90D. While the maximum residual compressive strength after 90D exposure is found to be 83% and 76% for 5% hydrochloric and 5% sulfuric acid, respectively of their 28D compressive strength. Binary specimens also reported higher resistance to sulphate attack than control WCC specimens. Finally, it can be concluded that WG can be effectively used with WCC-based geopolymer mixture in a binary system.