STABILITAS TANAH LEMPUNG BUKIT JIMBARAN DENGAN VARIASI CAMPURAN AIR LAUT, LIMESTONE, KAPUR PADAM, ABU SEKAM, SEMEN TYPE I DAN LIMBAH GYPSUM

Abstract

In addition to having very low soil bearing capacity, clay soil also shows plasticity and cohesion properties and has high shrinkage and expansion. Water content greatly affects clay soil. At high water content, clay soil will expand due to the air pores in the soil being completely filled with water and at low or dry water content it will shrink and the soil will become cracked. This study aims to determine the characteristics of the physical properties of Bukit Jimbaran soil before and after stabilization with sea water, limestone, slaked lime, rice husk ash, type I cement and gypsum waste and to analyze how much the Plasticity Index value of Bukit Jimbaran soil decreases after being stabilized with sea water, limestone, slaked lime, rice husk ash, type I cement and gypsum waste. The results of the research and data analysis showed that the Bukit Jimbaran soil before stabilization was fine-grained soil with moderate to poor gradation and had a Liquid Limit (LL) value of 82.7% with a Plasticity Index (PI) of 48.41% according to USCS which is Fine-Grained Clay with High Plasticity. After the addition of sea water, limestone, quicklime, rice husk ash, type I cement and gypsum waste to the clay soil as a whole can change the physical properties of the soil (index properties), such as then there is an increase in soil Specific Gravity (Gs), overall the higher the addition of additional material percentage variations will increase the changes in soil consistency properties (atterberg limits) of Bukit Jimbaran clay soil, namely a decrease in the liquid limit value (LL), as well as a decrease in the Plasticity Index (PI) value and soil consistency limit test [Atterberg Limit (LL, PL, SL)], that the greater the addition of additional material percentage variations, the plasticity index (PI) value will decrease, this means that the addition of Limestone, Quicklime, Rice Husk Ash and Type I Cement to the soil will be able to reduce plastic properties and shrinkage and expansion with data on Plasticity Index Decrease The largest decrease in the plasticity index value is in the stabilization of Bukit Jimbaran-Badung clay soil against Gypsum Waste 18.72% which was originally clay soil without Gypsum Waste stabilization with a Plasticity Index (PI) of 48.41%, there was a decrease of 29.69%, (from the initial plasticity index). And the second in the stabilization of Bukit Jimbaran-Badung clay soil against additional material of Kapur Padam Cement of 18.92% there was a decrease of 29.49% (from the initial plasticity index) and the third with the addition of Type I Cement material with a Plasticity Index (PI) of 26.52%, there was a decrease of 45.22% (from the initial plasticity index), then the fourth in the stabilization of Bukit Jimbaran-Badung clay soil against additional material of Sea Water with a Plasticity Index (PI) of 26.52% or a decrease of 21.89%, (from the initial plasticity index) the fifth stabilization of Bukit Jimbaran-Badung clay soil against additional material of Limestone with a Plasticity Index (PI) of 32.51% or a decrease of 15.90% from the initial plasticity index and the last is with the addition of Ash Rice Husk material Plasticity Index (PI) 35.25%. According to the research results, the most effective materials in reducing the plasticity index are slaked lime and gypsum waste.