Comparison of Laterite Soil and Slaked Lime to the Strength of Mortar Geopolymer Press on Curing In Water

Abstract

Most of the surface layer in the Papua and Kalimantan regions is laterite soil. When dry, the laterite soil will dry out, but the laterite soil becomes overworked when it contains large amounts of water. Cement production requires a large amount of energy, so concrete and mortar geopolymer is a material that has great potential as an alternative to reducing the use of PortSoil cement because it has mechanical properties that are almost similar to PortSoil cement-based concrete. This study discusses the use of fly ash and activator alkalis (NaOH and Na2SiO3) to bind laterite soil by adding Slaked lime to reduce the use of an oven to form a geopolymer mortar. The ratio of laterite soil and extinguished lime was 95%: 5% and 90%: 10%. Treatment is carried out after the specimen has hardened, curing in water for 3, 7, and 28 days. After treatment for 3, 7, and 28 days, it is decompressive strength testing and analyzed to determine the mortar geopolymer's behavior. The test resultof compressive strength of geopolymer mortar containing laterite soil and slaked lime on curing in water increased the compressive strength from 3 days to 28 days. In addition, to the curing age, variations in the laterite and Slaked lime soils also affect the geopolymer mortar's compressive strength. The compressive strength value increases with 5% to 10% Slaked lime, and all of the specimens show a brittle material.