THE EFFECT OF LIME VARIATION ON FLY ASH AND RICE HUSK ASH-BASED GEOPOLYMER MORTAR AS A BINDING MATERIAL AT A MOLARITY OF 8 M
DOI:
https://doi.org/10.26740/rekats.v14n01.p36-43Keywords:
Mortar, Geopolymer, Fly Ash, Compressive Strength, PorosityAbstract
Cement is widely used in construction but significantly contributes to CO₂ emissions. As an environmentally friendly alternative, geopolymer mortar—made from fly ash and rice husk ash (RHA) activated with 8M NaOH—eliminates the need for cement. This study was conducted to determine the effect of varying lime content (0%–4%) on the compressive strength and porosity of geopolymer mortar at the ages of 7, 14, and 28 days using cube molds measuring 5 cm x 5 cm x 5 cm. Fly ash contains 22.9% CaO, while RHA contains 1.4%. Lime acts as a stabilizer, but excessive amounts can hinder the formation of C-A-S-H gel, resulting in coarse crystals that reduce strength and increase porosity. The optimum result was achieved at 1.5% lime content, yielding the highest compressive strength (21.7 MPa) and the lowest porosity (13%) at 28 days. As the compressive strength of the mortar increases, the porosity percentage decreases, and vice versa. This study demonstrates that controlled lime addition can enhance the strength of geopolymer mortar, making it a viable and sustainable construction alternative.
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