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This research studied the compressive strength and fire resistance of geopolymer mortars using waste glass as a partial fine aggregate replacement. Fly ash (FA) and rice husk ash (RHA) that were the starting materials synthesized with a liquid alkali activator, is a mixture of 10 molar sodium hydroxide and sodium silicate solutions. Rice husk ash was used to replace fly ash at percentages of 0, 10, 20, 30, 40, and 50 by weight. Waste glass was ground to obtain sand-like particle sizes. Sand substitution with waste glass at 20% by weight was prepared. The results indicate that the workability and compressive strength of mortars decreased with an increase in rice husk ash content. The strengths of fly ash-rice husk ash geopolymer mortars at 28 days were in the range of 34 to 59 MPa, which are acceptable for some engineering applications. The geopolymer mortars retained their shapes up to 1,000°C that suitable for high temperature applications.
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