Unconfined Compressive Strength of Bagasse Ash Geopolymer Admixed in Soft Bangkok Clay

Abstract

This research presents the unconfined compressive strength of the bagasse ash geopolymer admixed in soft clay Bangkok. The study on varies according to variables to find the possibility of using geopolymer improvement soft soil instead of using cement. Bagasse ash (BA), an industrial by-product, was used as a precursor of geopolymer. A mixture of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) was used as a liquid alkaline activator. This research was studied the suitable ratio between alkaline activator and sodium hydroxide concentration. The soil moisture content at the liquid limit and bagasse ash content at 30% per weight of dry soil were used in this research. The study found the highest 28 days unconfined compressive strength at the ratio of sodium hydroxide to sodium silicate at 60:40, the sodium hydroxide concentration at 7.5 molars, bagasse ash content at 30% and Liquid Limit (LL) of soil.