The Effect of Adding Calcite and Silica Fume on Soft Clay Stabilization in Terms of Specific Gravity and Unconfined Compression Strength Dian Adiputra Purba (a), Syahril (a*), R. Desutama Rachmat Bugi Prayogo (b), Iin Karnisah (b), Indra Noer Hamdhan (c)
a) Magister of Applied Infrastructure Engineering Study Program, Department of Civil Engineering, Politeknik Negeri Bandung, Indonesia
b) Department of Civil Engineering, Faculty of Engineering, Politeknik Negeri Bandung, Indonesia
c) Department of Civil Engineering, Faculty of Engineering, Institut Teknologi Nasional Bandung, Indonesia
Abstract
The soil functions to absorb the pressure resulting from loads placed on it, requiring optimal bearing capacity to prevent damage or settlement. Soil stabilization is carried out to improve soil properties. In this study, clay soil stabilization will be conducted using a mixture of two materials, calcite and silica fume, to observe their effect on the specific gravity and unconfined compressive strength of the soil. The purpose of this research is to determine the influence of soil stabilization with the addition of calcite and silica fume on the specific gravity and unconfined compressive strength of the soil. This study involves assessing the physical properties (index properties) of the soft clay and mixed soil and determining the compressive strength (qu) of the soft clay and mixed soil. The tests were conducted with variations of calcite at 5% and silica fume at 6%, 8%, 10%, and 12%. The laboratory test results showed that the specific gravity of the soft clay was 2.591 g/cm3, and the specific gravity of the soil with mixed variations of calcite 5% and SF 6%, calcite 5% and SF 8%, calcite 5% and SF 10%, and calcite 5% and SF 12% were 2.546 g/cm3, 2.538 g/cm3, 2.534 g/cm3, and 2.526 g/cm3, respectively. The soft claysoil had an unconfined compressive strength (qu) of 0.412 kg/cm2. The soil with 0 days of curing had an unconfined compressive strength (qu) of 0.594 kg/cm2, 0.942 kg/cm2, 1.181 kg/cm2, and 1.284 kg/cm2 for the mixtures of calcite 5% and SF 6%, calcite 5% and SF 8%, calcite 5% and SF 10%, and calcite 5% and SF 12%, respectively. For the soil with 3 days of curing, the unconfined compressive strength (qu) for the mixtures of calcite 5% and SF 6%, calcite 5% and SF 8%, calcite 5% and SF 10%, and calcite 5% and SF 12% were 1.036 kg/cm2, 1.121 kg/cm2, 1.233 kg/cm2, and 1.569 kg/cm2, respectively.
