Utilization of Lime and Rice Husk Ash for Peat Soil Stabilization in Different Water Content Condition

Abstract

Peat soil is a soft soil with more than 75% organic content, very high void ratio, and very high water content. In recent times, the lack of land use has made peat soil as an option for agriculture, drainage channels, and also for construction. Utilization of peat soil usually causes the peat soil water content to decrease. Based on the condition of its water content, the condition of peat soil can be classified into several conditions, which is peat soil with constant water content, peat soil which affected by ambient water content, and dried peat soil. Some of the improvement efforts made include the method of improvement by means of stabilization. The stabilization material used was a mixture of lime (CaCO3) and rice husk ash with the combination of 70% rice husk ash and 30% lime. Based on those studies, the use of the stabilization method is not recommended if the peat soil water content has decreased more than 50%. Therefore, the peat soil water content needs to be maintained in order for the stabilization to be effective and also for the sake of environmental preservation.

Bacteria Pseudomonas taiwanensis as a decomposing agent of peat fiber

“…According to ASTM D-4427-07, peat with a fiber content of 61,14% is classified as " moderate fibrous peat" or "hemic peat". This is in line with the results of previous studies which state that the peat of Bereng Bengkel Village, Palangkaraya is classified as moderate fiber peat or hemic peat (Ma'ruf et al, 2022;Prativi et al, 2018;Yogyanta et al, 2019;Yulianto et al, 2022). This can also be proven based on visual soil observations, where the soil has clearly visible fibers, a soft and moist texture, and a blackish brown color, as shown in Figure 7.…”

“…Accelerating the peat fiber decomposition process is intended to reduce the peat fiber content, which is the main cause of the high water content in fibrous peat. Once the peat fibers are successfully decomposed, the fibrous peat will become denser and stiffer, resulting in improved geotechnical properties (Ma'ruf et al, 2022).…”

Accelerating peat fiber decomposition by bacteria Pseudomonas taiwanensis and its impact on the physical properties and shear strength of fibrous peat in Palangkaraya

“…Table 2 shows the physical and engineering properties of the fibrous peat under study. The results obtained from the laboratory soil testing are in accordance with the results of previous studies [7,9,28,29,37]. Based on Table 2, it is known that Palangkaraya fibrous peat has a water content of 704.02%.…”

Parameters Changes of Stabilized Fibrous Peat With Eviromentally Friendly Materials Due to Water Filtration From the Surroundings on Different Area of Stabilization

“…Fibrous peat soils are classified as soft soils because of their very low bearing capacity, and uneven settlement, to very soft clays [1,2]. This characteristic results from the fact that this soil is formed by the weathering of tropical plants submerged in water.…”

“…This characteristic results from the fact that this soil is formed by the weathering of tropical plants submerged in water. Furthermore, this type of soil consists of high organic contents and low acidity, making it unfavorable for the construction of civil buildings [1, 2,3]. Therefore, it is important to improve the soils' properties and various improvement techniques have been widely used.…”