Analisis Kuat Tekan dan Durabilitas Mortar Geopolimer Berbahan Dasar POFA dan GGBFS terhadap Larutan Asam

Abstract

Indonesia is ranked first as the country with the largest palm oil production in the world. Palm oil is processed into edible oil. However, the processing process produces Palm Oil Fuel Ash (POFA) which is a problem in the industry because its utilization is minimal while production continues to increase. In this research, Palm Oil Fuel Ash (POFA) was used as a raw material for geopolymer mortar which was added with GGBFS to increase durability and compressive strength. The research method used is experimental with material variations, namely POFA and GGBFS, namely 100:0, 90:10, 80:20, 70:30, 60:40 and 50:50 and variations in NaOH molarity of 8 M, 10 M, 12 M, and 14 M. In the research, compressive strength and durability tests were carried out in sulfuric acid (H2SO4) solution with a concentration of 11% for 28 and 56 days. The research results showed that the maximum compressive strength occurred in the material variation POFA 50%: GGBFS 50% with a molarity of 14 M NaOH of 14.9 MPa with a soaking time of 28 days, the compressive strength continued to decrease after soaking for 56 days. The minimum density change was 2.97% in the variation with more POFA content and the additional density increased with increasing GGBFS. The precursor ratio and soaking time greatly influence the compressive strength and durability of geopolymer mortar.