Peat stabilization using combination of portland limestone cement, industrial wastes and chemical additives

Chong, Chai Ling (2020) Peat stabilization using combination of portland limestone cement, industrial wastes and chemical additives. [Final Year Project Report] (Unpublished)

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Abstract

Peat is a problematic soil as it has the characteristics of high water content, low shear strength and high compressibility, which will cause instability of building foundation and cracking at road pavement. Therefore, the soil improvement method used in this study is partial replacement method by adding Portland Limestone cement (PLC), industrial wastes such as fly ash (FA) and yellow phosphorus slag (YPS), and chemical admixtures such as MasterRoc SLF 41 (SIKA) and Stabilized Recycled Sustainable (SRS) to the peat soil. This study is focusing on stabilizing shallow peat at Kota Samarahan area. Four sets of treated samples are prepared by mixing the peat with PLC, FA and YPS and different chemical additives. The percentage of chemical additives (SRS & SIKA) and PLC added are remains constant throughout this study. The samples are air-cured for 28 days before conducting the testing. The laboratory testing such as density, specific gravity, shrinkage and water absorption tests are conducted to determine the physical properties of the treated peat samples. The Compressive Strength (CS) test is performed to evaluate the maximum compressive strength of the stabilized peat. The results show that the FA_SRS samples have the lowest percentage of shrinkage (0.70%) while the YPS_SIKA samples had the highest shrinkage percentage (16.84%). Then, the compressive strength of the treated samples obtained at the age of 28 days is 3.07N/mm2 (FA_SRS samples) and the other three sets of treated samples obtained zero strength under Compressive Strength (CS) test. In conclusion, YPS is not effective but FA is effective in peat stabilization. Besides, SRS is a satisfactory chemical additive but SIKA is not a satisfy additive in peat stabilization. It is proved that the design mixture of peat with PLC, FA and SRS have the potential to stabilize the peat soil which achieved a satisfactory compressive strength of 3.07 1 N/mm2.

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