POLYACRYLAMIDE (PAM) WITH COHESIVE SOIL AS AN ALTERNATIVE MATERIAL FOR COMPILING LOAD TRANSFER PLATFORMS WITH LABORATORY TESTING AND FINITE ELEMENT METHOD APPROACH

• Main Author: RAHMAN SYAFEI, REZA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/60982
• Institution: Institut Teknologi Bandung

Controlled Modulus Columns (CMC) is a soil improvement technique whose installation is carried out by forming semi-rigid inclusions to increase the overall strength of the soil mass in an effort to deal with problems such as settlement and bearing capacity, In order to avoid direct load transfer like piles in general, CMC generally uses compacted coarse-grained material as a layer to distributed the load. One of the problems that arise in the use of LTP is the limited availability of material in certain areas, which is granular material with a specification of content fine grained <15%. In an effort to overcome this problems, this study will discuss the use of compounds synthetic polyacrylamide (PAM) to optimize the existing materials at the site. PAM is a powder concentrate of acrylamide, surfactant and binder which when mixed with water forms a liquid co-polymer, the main function of using this material is to increase soil strength in wet and dry conditions of the soil. This thesis aims to determine the effect of the use of PAM added into the residual soil to analyze its effect on the value of the soil strength parameter, load distribution, and settlement that occurs in the CMC system with LTP. The results show, the MDD value is reduced by 0.26% at high plasticity index. and increased by 0.63% at low plasticity index, the permeability value decreased in the range of 44.15-61.96%, the cohesion value increased in the range of 13.3-100% of the initial value, the friction angle decreased by 5% at high IP, and increased by 13.5% at low IP, from the stress distribution, it can be seen an increase in effective stress, a decrease in the value of strain and punching shear in the LTP layer with PAM.