Stabilization of Peat Soil Using Fly Ash, Bottom Ash and Portland Cement: Soil Improvement and Coal Ash Waste Reduction Approach

Abstract

Peat soil is very compressible, which leads to an excessive settlement. Stabilization of peat soil is the way to improve the engineering properties of peat soil through mixing peat with supplementary cementation materials. Therefore, this study aims to investigate the stabilization of peat soil using fly ash, bottom ash and ordinary Portland cement (OPC) to improve the engineering properties of peat soil. Also to examine the possibility of fly ash and bottom ash waste reduction through using them as a binder of the mixture in soil improvement application. In this study, fly ash and bottom ash were collected from generation wastes at coal- fired electric power and stabilization of peat soil was done by mixing peat soil with fly ash, bottom ash and OPC. Unconfined compressive strength (UCS) and Fourier transform scanning electron microscope (FESEM) was conducted before and after the stabilization of peat soil. Also, some essential physicochemical properties of a mixture have identified before the mixing process. The findings of the compressive strength of peat soil were equal to 5 kPa at its natural state and after stabilization strength of peat soil was equal to 47 kPa. FESEM micrographs have shown ultrastructure of peat stabilization appears as inherent and coherent while the ultrastructure of original peat appears as incoherent and sporadic. The findings have revealed the effectiveness of fly ash and bottom ash to improve the strength of peat and the applicability of the utilization of coal ash waste as binder materials.

Settlement Behaviour of Stabilised Peat: An Assessment With Eco-Processed Pozzolan (Epp) in Modified Electro-Osmotic Triaxial Cell

“…The moisture content for KBpt is accepted to be between the ranges, according to the prior result. In previous studies on moisture content, different number of moisture content have been found, ranges from 491.16 to 985.3 percent according to [14], 678 percent according to [15], and 546.43 percent according to [16]. The moisture content of the soil and its shear strength are inversely proportional on the authority [17].…”

Engineering Properties of Expansive Clay Soils with Sustainable Stabilization Methods

“…Stabilized peat showed an increase in compressive strength, with the 89 % Compressive strength increasing during 14 and 28 days from 27 kPa to 42 kPa. (Hauashdh et al 2020)Nazmi carried out experiments like the Unconfined Compressive Strength, California Bearing Ratio (CBR), and Atterberg's Limit to demonstrate how CBA as a stabilizing agent improves the strength parameters of expansive soil. Additionally, coal bottom ash is utilized in the subgrade to improve roadways.…”

Rare Erath Elements: Their Geological Sources and the Potential of Organosulfonic Acids For Rare Earth Elements Leaching from Coal Ash and Process Optimization

“…The major components of coal ash consist of oxides of Si, Fe, Al, and Ca, and residual carbons with bottom and fly ashes containing 185.8 mg/kg and 179.2 mg/kg of REEs, respectively , (USDT, 2016). The following Table 1 shows the major oxides of coal fly ash (Hauashdh et al, 2020) while Figure 4 shows trends in coal ash generation based on statistics data from six energyintensive economies. Table 1.…”