EXPANSIVE SOIL STABILIZATION UTILIZING WASTE GLASS POWDER CONCERNING SHEAR STRENGTH, DENSITY, AND SWELLING POTENTIAL

• Main Author: Lamiyah, Futri
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/74762
• Institution: Institut Teknologi Bandung

Expansive soil undergoes significant shrinkage expansion when its moisture content changes. The mineralogy of expansive soil is responsible for its shrinking properties. High shrinkage expansion damages structures constructed on it. The structure cracks due to differential movement and upheaval of the foundation, which causes the damage. The damage is caused by differential movement and heaving of the foundation resulting in structure cracks. There are numerous regions in Indonesia with expansive clay substrates. Consequently, it is essential to identify and enhance expansive soils. This research employed X-Ray Diffraction testing to identify the soil minerals that led to expansive soil properties. This study utilized soil samples from the Groundsill Project in Cipamingkis, Bogor Regency, West Java. The study’s findings demonstrated that montmorillonite (14.5%) and nontronite (14.7%) were the minerals causing expansive properties in soil samples. This study improved soil by adding powdered glass waste. Due to silica minerals and a trace quantity of lime, glass powder could stabilize expansive soils. These two minerals were CSH and CAH compounds which can increase soil strength.This study’s addition of glass powder containing 2.5%, 5%, 10%, and 15% was varied, as were curing periods of 0 days, 3 days, 7 days, and 14 days. On soil samples before and after stabilization with waste glass powder, soil properties index, soil density by Standard Proctor, unconstrained compressive strength, onedimensional development, and methylene blue were tested in the laboratory. The optimum glass waste powder content and optimum curing time to increase density and shear strength and decrease soil development were determined. It was revealed that adding glass waste powder decreased the Atterberg limit and optimal moisture content, increasing the maximum dry density and shear strength to a certain level. Furthermore, adding glass waste powder decreased the soil’s development potential and development pressure. In addition, it was discovered that the extended curing time increased shear strength and decreased Atterberg limits and soil development potential. It was revealed that adding glass waste powder decreased the Atterberg limit and optimal moisture content, increasing the maximum dry density and shear strength to a certain level. Furthermore, adding glass waste powder decreased the soil's development potential and development pressure. In addition, it was discovered that the extended curing time increased shear strength and decreased Atterberg limits and soil development potential.