This chapter describes sample collection, sample preparation to perform laboratory tests and basic property tests. Three types of soil samples are selected, and the soil samples are stabilized with a combination of two materials which are fly ash and alkaline liquid. The homogenous mixture of fly ash and alkaline liquid is called fly ash based geopolymer (FA geopolymer). The soil samples are mixed with water, and mixed with FA geopolymer. Both compacted soil samples with water and with geopolymer are cured for 7 days and non-cured (0 day) under ambient temperature to be continued direct shear test.