Abstract
The study objective is to develop alternative binders that are environment friendly by utilizing sugarcane bagasse ash (SCBA) in the organic soil stabilization. Together with SCBA, Ordinary Portland Cement (OPC), calcium chloride (CaCl 2 ) and silica sand (K7) were used as additives to stabilize the peat. In obtaining the optimal mix design, specimens of stabilized peat were tested in unconfined compression. It was found that stabilized peat comprising 20% and 5% (PCB1-20 and PCB2-5) partial replacement of OPC with SCBA 1 and SCBA 2 attain the maximum unconfined compressive strength (UCS) and discovered greater than UCS of peat-cement (PC) specimen. At the optimal mix design, the UCS of the stabilized peat specimens increased with increasing of curing time, preloading rate, OPC and K7 dosage. For PCB1-20 mixture, inclusion of a minimum OPC of 300kg/m 3 and K7 of 500kg/m 3 along with curing under 20kPa pressure is recommendable for the peat stabilization to be effective. However for PCB2-5, it suggested to use more OPC and K7 dosage or alternatively increase the preloading during curing to 40kPa in order to achieve target UCS. It can be concluded that SCBA 1 has better quality than SCBA 2 in peat stabilization especially the contribution made by its fine particle size.
Highlights
As a result of high organic content, presence of humic acid and less solid particles in peat soil, the proper hydration of stabilized peat could be hindered [1,2,3,4,5]
The materials that had been used in this study are peat soil, Ordinary Portland Cement (OPC), calcium chloride (CaCl2), silica sand and Sugarcane Bagasse Ash (SCBA)
sugarcane bagasse ash (SCBA) 2 mixture achieves the optimum at only 5% of cement replacement (PCB2-5) and recorded slight increment compared to PC specimen
Summary
As a result of high organic content, presence of humic acid and less solid particles in peat soil, the proper hydration of stabilized peat could be hindered [1,2,3,4,5]. That means the large amount of cement is needed in order to neutralize the acids or otherwise the process of the soil stabilization remains retarded. The productions of sugarcane is world number one commodities with amount around 1.9 billion tonnes in 2013[8] and produced a lot of bagasse. The sugarcane industry is still seeking solutions to dispose of the wastes generated by the sugar and alcohol production processes. This ash is used as fertilizer in the plantations, but it does not have adequate mineral nutrients for this purpose [10]. The utilization of SCBA in the stabilization of peat soil can be an interesting idea and appears to be promising alternative when considering issues of energy consumption and pollution. The objective of this research works is to evaluate effectiveness factors of two type of SCBA inclusion in peat stabilization on its strength
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