In the study, the recycled clay brick powder/fine soil powder-based sodium hydroxide alkali-activated mortar (AAM) specimens were prepared by mixing different percentages (100/0, 80/20, 60/40, 40/60, 20/80, and 100/0, respectively) to investigate the mechanical and durability performance of sustainable AAM specimens for the possible utilization instead of OPC. The constant ratio of glass powder was used in the production of AAM to increase the alkalinity and improve the mechanical properties of alkali-activated mortar. Also, the influences of sodium hydroxide molarity concentrations (8, 10, 12, 14, and 16 M) on the performance of AAM specimens were studied. The compressive strength, water absorption, and water sorptivity tests were conducted on the AAM specimens and the relationships between the investigated parameters were analyzed. The obtained results revealed that the fine soil powder replacement with clay brick powder improved the compressive strength, and reduced water absorption and water sorptivity up to 80% replacement ratios, and the superior mechanical and durability performance was obtained in the 80% fine soil powder-based AAM specimens. For the higher fine soil powder replacement ratio (100%), the performances of the AAM specimens were found to be adversely affected. Besides, the concentration of NaOH solution significantly influenced the material performances of the fine soil powder-based AAMs and 12 M NaOH concentration performed superior mechanical and durability performance. The strength enhancement of the AAMs was found to be significant after 90 days of ambient curing period.
The fresh and durability properties of alkali-activated mortar were investigated in this study. Ground granulated blast-furnace slag was used as a binder material. Both carbon fibres (CFs) and polypropylene fibres (PPs) were added at ratios of 0, 0.75, 1.00 and 1.25% by weight of the binder. Simultaneously, hybrid fibres were also used (CF 1.0% and PP 0.25%, CF 0.5% and PP 0.5%, and CF 0.25% and PP 1.0%). The fresh properties of the composite were investigated by performing a flow test. Durability properties such as fire resistance, water sorptivity, water absorption, density, porosity, efflorescence and sulfate attack were also investigated. According to the findings, increasing the fibre content reduces the flowability of the mixture. Simultaneously, the best fibre content studied was 1%, which significantly enhanced durability properties. Also, both fibres achieved excellent improvement. However, CF had more influence than PP on durability properties.
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