Pengaruh Penggunaan Abu Sekam Padi Sebagai Bahan Pengganti Semen Terhadap Kuat Tekan Beton K-300 dengan Bahan Tambahan Superplasticizer

Abstract

This study intends to investigate the effect of employing rice husk ash (RHA) as a partial substitute for cement on the compressive strength of K-300 grade concrete, along with evaluating the effectiveness of adding superplasticizer to the concrete mixture. This research is grounded in the need for environmentally friendly and efficient concrete materials, considering the high carbon emissions from the cement industry. RHA is selected due to its high silica content and pozzolanic properties, which can enhance concrete strength. The research uses an experimental method with cement substitution variations of 9%, 12%, and 15% RHA, along with a 1.5% addition of sodium gluconate-based superplasticizer in some mixtures at 14 and 28 days of curing, compressive strength tests were performed. The outcomes show that the concrete mixture with 15% RHA and 1.5% superplasticizer achieved the highest compressive strength, indicating a synergistic effect between RHA and superplasticizer in improving concrete performance. Therefore, RHA can be considered an effective alternative cement substitute to support sustainable construction.