Effect Of Marble Waste On Fly Ash-Rice Husk Ash Geopolymer Using 10M NaOH Solution
DOI:
https://doi.org/10.26740/rekats.v14n01.p70-78Keywords:
Compressive Strength, Geopolymer, Marble Waste, PorosityAbstract
Mortar uses Portland cement as a binder in its production. In the manufacturing process of Portland cement, the amount of carbon dioxide (CO₂) released is one of the contributors to global warming. A popular alternative to cement is geopolymer. Several studies have shown that the CaO content in fly ash can improve the mechanical properties of geopolymers. Another material with a high CaO content is marble waste, which contains about 98.85% CaO. This study was conducted to determine the effect of adding marble waste on compressive strength, porosity, and setting time of geopolymer mortar made from fly ash and rice husk ash, using a 10M NaOH activating solution. The mortar specimens were cube-shaped with dimensions of 50x50x50 mm³, with marble waste added at varying proportions of 0%, 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, and 20%. The results showed that the addition of marble waste increased compressive strength up to a ratio of 12.5%, after which it declined. Conversely, porosity increased after 12.5%. This is due to an imbalance in the reaction caused by excess CaO relative to SiO₂ and Al₂O₃, with the highest compressive strength reaching 24.35 MPa and porosity at 7.57%.
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