Published Paper Details:

Geopolymer stabilization can transform a wide range of waste alumino silicate material into building and mining material with excellent chemical and physical properties. However, there is lack of research related to geopolymer stabilized soil compared to use of geopolymer in concrete. In this study, the utilization of geopolymer has been investigated to stabilize the soil including the factors affecting the geopolymer stabilization process. Geopolymer is based on alumino-silicate chain which is a combination of alumino silicate material and alkaline activator. In this study, fly ash was used as a alumino silicate material, combination of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) was used as an alkaline activator. Unconfined Compressive Strength (UCS) was an indicator to the strength development and hence evaluating the performance of geopolymer stabilized soil. This study focusses on the effect of fly ash and alkaline activator with different molarities of NaOH solution (6M, 8M and 10M) on geopolymerized soil which was prepared and cured for 3 days. Three different ratios (2.0, 2.5 and 3.0) of fly ash and alkaline activator with three different ratios (2.0, 2.5 and 3.0) of alkaline activator were used. UCS tests were carried on prepared specimens. The maximum UCS strength obtained was 166kN/m2 for the geopolymer stabilized soil using ratio of fly ash and alkaline activator 2.0 with ratio of alkaline activator 2.0 and 8M NaOH solution.