IMPROVEMENT OF COMPRESSIVE STRENGTH AND DURABILITY FOR BASE LAYER WITH GEOPOLYMER MATERIALS BY USING BAGASSE ASH AND RICE HUSK ASH

Abstract

Loess soil in dry conation is easily lost its strength and collapsed when increased its moisture content for a sufficient time. The of objective this research is to study the improvement of the loess soil with bagasse and rice husk ash-based geopolymer material, compared with the standard of Department of Highways dh-s. 204/2556 for soil cement. The unconfined compression test and durability test in term of wet-dry process method were conducted in laboratory. The specimens were prepared as 95% modified compaction with optimum liquid content. For geopolymer, curing temperature of 70, 90 and 110 ^๐C were used for 1 day then curing with room temperature up to 2, 7 and 28 days for curing time, respectively. The ratio of sodium silicate and sodium hydroxide of 1:3 is used. The results shown that for 7-day curing time, the maximum compressive strength was obtained from the lower percentage of bagasse ash with rice husk ash, BA10RH5 at the curing temperature of 70^๐C but at higher curing temperature, the maximum compressive strength was obtained from the lower percentage of bagasse ash without rice husk ash, BA10 and that compressive strength were more than the compressive strength of soil-cement, SC5. In term of durability, the SC5, BA10-70 and BA10RH5-90 were chosen using wet-dry method. The percentage of loss in SC5 is 11.06% that was more than those of BA10-70 and BA10RH5-90 as 4.57% and 9.05%, respectively. The results of percentage of loss were related to their corresponding compressive strength.