Performance study on clayey soil stabilized by lime and geopolymer with partial replacement of sodium bentonite as an additive.

To encounter the low bearing capacity, sudden shrinkage, and expansion of clayey soil at the starting stage of any new construction, an initial laboratory investigation is essential. For that, In this research, at the initial stage, a clay sample was taken as an oven-dry form having a silt content of 65.24% and clay content of 32.16%. The comparison property such as UCC, Atterberg limits and microstructural analysis using SEM of virgin soil parital additive with sodium bentonite (SB) stabilized with lime and the soil partial additive with SB treated with Sodium based alkaline Geopolymer (GP) were studied under the controlled condition after the stabilization, at various curing periods of 3,7,14,28 days and 2 hours immediately preparing the sample. The UCC samples were prepared and tested in untreated clay the value is obtained about 343.8kN/m2, after the stabilization at 28 days curing the results show that in lime stabilization was about 599.42 kN/m2 gained at 5% of SB content and in GP stabilized soil UCC value is about 1466.7 kN/m2 at 5 molar solution @ 1% of SB content @ 28days of curing. The results shows that a limited percentage of SB in geopolymer is enough to improve the soil strength but a larger amount was essential to enhance the enhancement and durability property and the SEM results have proved that the texture alteration of clay contributed to the contact of the particle as closer with Sodium bentonite admixed soil by geopolymer due to the bonding between particles due to the gel formation and hardening when compared to lime stabilization. [ABSTRACT FROM AUTHOR]