LABORATORY EVALUATION OF THE INFLUENCE OF ADDITION DIFA SOIL STABILIZER TO STABILITY OF SOIL CEMENT USING SOIL FROM KEEROM - PAPUA AS A SUBSTITUTE FOR GRANULAR SUBBASE

• Main Author: NAGA , RISMAN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30536
• Institution: Institut Teknologi Bandung

<p align="justify">This thesis describes laboratory research on soil cement stabilization using soil from Keerom Regency with the addition of DiFA Soil Stabilizer / DiFA SS to reduce the negative properties of soil cement which can cause cracks on the surface. <br /> <br /> Soil samples taken from Bate Village, Arso District, Keerom Regency according to AASHTO are classified as A-6 and according to the USCS as CL. The main minerals contained therein are calcite minerals (CaCO3), with an IP = 12.36%; CBR = 5.08% and UCS = 3.87kg/cm2. Thus soil shows a low carrying capacity, but is suitable as a stabilizing material (IP <20%), so it needs to be improved to meet the specifications of the lower foundation layer (subbase), namely in the form of stabilization with cement. The cement content in the mixture of soil cement was determined based on several methods by considering soil physical properties, obtained 9% cement content, while the addition of DiFA SS additive was 1.0%; 1.5%; 2.0%; 2.5% and 3.0%. The study was carried out on a mixture of soil cement without additives and with 5 variations of additive levels of DiFA Soil SS. The parameters used to determine the structural strength characteristics of soil cement are the UCS and CBR values. <br /> <br /> Giving cement in soil (soil cement) can significantly increase the value of structural strength. UCS increased 102.02% from 3.87 kg/cm2 to 7.82 kg/cm2, while CBR amounted to 1.769% from 5.08% to 94.96% with almost no change / small shrinkage of around 1.77%, however The value of the 11.25% IP is still above 10%, so it does not meet the specifications as a subbase, while with the addition of DiFA SS also improves the performance of soil cement. Adding 2.5% gives the most optimum increase. IP value 7.24; CBR 104.32% and UCS 15.22 kg/cm2 have met the specifications as a subbase.<p align="justify"> <br />