OPTIMALISASI KUAT TEKAN BETON GEOPOLIMER MENGGUNAKAN FLY ASH DAN ABU SEKAM PADI
DOI:
https://doi.org/10.51988/jtsc.v6i2.286Keywords:
Compressive strength, Fly ash, Geopolymer concrete, Rice husk ash, Sustainable construction, WorkabilityAbstract
Concrete is a widely used construction material, but its environmental impact, particularly the CO? emissions, has led to the search for more eco-friendly alternatives. Geopolymer concrete, utilizing fly ash and rice husk ash as binders, presents a promising alternative to conventional concrete. This study aims to investigate the effect of varying the composition of fly ash and rice husk ash on the mechanical properties and workability of geopolymer concrete. The mix variations used consisted of fly ash and rice husk ash ratios of 100:0, 80:20, 70:30, and 50:50, with an alkaline activator solution of 12M NaOH and Na?SiO? in a 1:2.5 ratio. The results showed that the 100% fly ash mix produced the highest compressive strength of 23.13 MPa and a slump value of 8.0 cm, indicating good performance in both strength and workability. On the other hand, increasing the rice husk ash proportion led to a decrease in compressive strength and slump, with the lowest values observed at the 50% rice husk ash mix, which resulted in a compressive strength of 17.20 MPa and a slump of 5.5 cm. Based on these results, it can be concluded that fly ash remains the superior binder for geopolymer concrete, while rice husk ash can be used in controlled proportions to support environmental sustainability. Further research is recommended to explore the use of other additives and conduct microstructure analysis to enhance the performance of geopolymer concrete.
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