Effect Of Lime Addition On Geopolymer Mortar Based On A Combination Of Fly Ash And Rice Husk Ash (In 12 Molar Naoh Condition)
DOI:
https://doi.org/10.26740/rekats.v14n01.p37-45Keywords:
Fly Ash, Rice Husk Ash, Lime, Compressive Strenght, Geopolymer MortarAbstract
Geopolymer mortar is an environmentally friendly alternative to conventional cement, developed to reduce the impact of global warming by utilizing materials rich in silica (Si) and alumina (Al). Fly ash has a chemical composition similar to cement, while rice husk ash contains up to 94% silica. Lime (Ca) is added to accelerate the setting and hardening processes at ambient temperature. This study investigates the effect of lime addition on geopolymer mortar composed of fly ash and rice husk ash activated with 12 M NaOH solution. A total of 150 cube specimens (50 × 50 × 50 mm) were prepared using ten mix designs (GP, 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, and 4%). Optimal performance was achieved at 2.5% lime addition, with a compressive strength of 23.35 MPa, porosity of 7.55%, and a setting time of 555 minutes. This mix offered a balance between setting time and workability. However, adding more than 2.5% lime reduced compressive strength, increased porosity, and caused overly rapid setting. This behavior was attributed to undissolved lime particles that disrupted matrix compactness and accelerated early-stage reactions, thereby reducing overall performance and workability in practical applications.
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