Civil Engineering structures are not usually constructed on soft soils due to low bearing capacity and shear strength. Traditional stabilizers or geopolymers based on industrial wastes should be used to stabilize the soft soil. In this study, the effect of lime and metakaolin based geopolymer on the compaction characterstics of soft soil were investigated. The metakolin were used in the ratio of 5% and 10% of the dry weight of the soil.The soft soil were air dried and pulverized according to ASTM-D698 before application of lime and geopolymer.The geopolymer were prepared using sodium hydroxide and sodium silicate alkali activators. The molarity of sodium hydoxide was 10 and the alkali solution of Na2SiO3/NaOH were in the ratio of 70/30 respectively. According to the findings, soft soil had a maximum dry density (MDD) of 1.52 g/cm3 and an optimum moisture content (OMC) of 27%. However, lime-treated soil has a maximum dry density of 1.47 g/cm3 and an optimum moisture content of 27%. For 5% and 10% geopolymers, the maximum dry density of geopolymer-stabilized soil increased from 1.46 g/cm3 to 1.5 g/cm3 respectively. The soil that was treated with a lime and geopolymer mixture had a lower maximum dry density and a higher optimum moisture content. Based on the experimental study, lime treated soft soil showed decrease MDD and increased OMC due to the agglomeration and floculation effect of lime.The agglomeratio and floculation effect also clearly observed in the lime-geopolymer treated soft soil.
Anahtar Kelimeler: Compaction characterstics, Geopolymers, Soft soil, Maminum dry density, Optimum moisture content