Strength Enhancement of Stabilised Peat by using Cement, Ground Granulated Blast-Furnace Slag and Chemical Admixture as Additives

Low, Kah Yen (2020) Strength Enhancement of Stabilised Peat by using Cement, Ground Granulated Blast-Furnace Slag and Chemical Admixture as Additives. [Final Year Project Report] (Unpublished)

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Abstract

Peat are generalised as organic soil consists of mineral matter, water and contains more than 75% of the organic content due to the deposition of decomposed plant materials. Constructions over peat possess great challenges to engineers due to its characteristics of having high moisture content, high void ratio and low undrained shear strength. In-situ peat stabilisation method which leaves the peat in place and carries out peat stabilisation works for shallow peat within 3m depth is an alternative ground improvement technique for conventional peat removal and replacement method. This study deals with peat stabilisation works where the peat is added with various concrete constituents to create stable peat materials by incorporating cement, industrial waste and chemical admixtures into peat. Therefore, this research study is carried out to describe the laboratory research on the peat stabilization through partial replacement method with the idea of introducing industrial waste mixed into the peat to reduce shrinkage effect of peat. This research is aimed to determine the role and contribution of concrete constituents in enhancing the geotechnical properties of peat. The effectiveness of Ordinary Portland Cement (OPC), Portland Limestone Cement (PLC), Ground Granulated Blast-Furnace Slag (GGBS), Stabilised Recycled Sustainable (SRS) Solution and SIKA as chemical addictive in stabilising peat is determined while investigate the most optimum strength bn the pro posed mix design composition of stabilised peat in strengthening the engineering properties of peat for road construction. The research area focused on Samarahan area. Peat properties before and after stabilization, design methods including preliminary testing, stabilisation technique and mix composition, methods of laboratory testing, performance of stabilised peat, environmental effects, durability, applications, and limitations of all concrete constituents are all presented and discussed in this study. The experimental data has shown that the strength of stabilised peat after 28 days has improved and the strength of OPC-stabilised peat and PLC-stabilised peat is more than 3. OkPa, achieve the strength requirements of basement for road construction. Therefore, peat stabilisation using cement, GGBS, SRS and water has a potential to stabilise peatland for road construction in the future.

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