Compressive Strength of Marginal Lateritic Soil Improved by Waste Ash Geopolymer

Abstract

This research investigated compressive strength of marginal lateritic soil improved by waste ash geopolymer. Marginal lateritic soil was obtained from borrow pit, Chaloem Phra Kiat District, Nakhon Ratchasima. Waste ash obtained from Waste to Energy Power Plant, Songkhla. Marginal lateritic soil: Waste ash ratios of 100:0, 90:10, 80:20 and 70:30, Sodium silicate (Na₂SiO₃):Sodium hydroxide (NaOH) ratios of 20:80, 10:90 and 0:100 and NaOH concentration of 8 M were used in this research. It can be seen that 7-day soaking compressive strength of marginal lateritic soil improved by waste ash geopolymer increased as waste ash content and Na₂SiO₃:NaOH ratio increased. The maximum 7-day soaking compressive strength of marginal lateritic soil improved by waste ash geopolymer was at waste ash content of 20% and Na₂SiO₃:NaOH ratio of 10:90.