Laboratory study on the workability of liquified stabilized soil

• Main Author: Pudur, Nandagopalan Svetha
• Other Authors: Yi Yaolin
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering; Marine clay; Liquified stabilized soil
• Online Access: https://hdl.handle.net/10356/176335
• Institution: Nanyang Technological University

In Singapore, huge quantities of marine clay (MC) are excavated and dumped as waste due to its unwanted engineering properties such as high-water content, low strength and its sticky nature. In this study, water, sand and cement are added to the marine clay, producing a liquified stabilized soil backfilling material. Following the practical engineering process, water was added to the MC first in order to produce a flowable slurry. Next designed amounts of sand and cement were mixed with the slurry in order to prepare the stabilized sand-MC mixture samples. Measurement of the flowability of the freshly prepared mixture and the unconfined compressive strength of the harden mixture were taken. Additionally, the liquid limits of the sand-clay mixtures with different sand contents were also measured. From the results obtained its was found that a key factor that influenced the flowability of the fresh mixture and the strength of the hardened mixture was the ratio of water content to liquid limit. The results showed that that the ratio of water content to liquid limit generally decreased for an increase in the sand content. However, there was small range of sand content added whereby the ratio of water to liquid limit increased as compared to the original MC slurry. Due the addition of sand the dry density was to be increased while the void ratio was found to be decreased, which benefitted the strength increase. Based on the strength and flowability results, a method to estimate the optimum cement and sand dosage in the liquified stabilized soil is suggested.