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

Abstract

Peat's settlement behavior is a classic problem in construction. The dominant feature of peat is when subjected to load, it is noted for its great compressibility, high moisture content, poor shear strength, and long-term settlement. This study adopts the method of electro-osmotic to stabilize peat soil with Eco Processed Pozzolan (EPP) in the modified electro-osmotic triaxial cell. Peat samples were tested incorporated of the controlled; peat soil, and treated samples; peat soil with 70% of EPP, peat soil with 50% of EPP and 50% of cement, and peat soil with 70% of EPP and 30% of cement. EPP and cement were mixed with 10ml of EPP's liquid concentration. The objective of this study is to investigate the characteristics of peat soil settlement behavior on the load-carrying capacity and its compressibility and to assess the chemical properties of peat soil stabilized with EPP, and addition of binder, cement before and after the treatment. In this study, the results show that EPP coupled with cement is qualified to reduce the settlement behavior of peat soil with the addition of a stabilizer. It is observed that the settlement behavior of peat soil mixed with 70% of EPP and 30% of cement underwent small-scale settlement at first and remained constant. Peat soil coupled with 50% of EPP and cement has shown a significant improvement compared to the control sample and peat soil with 70% of EPP. Additionally, the mixes were examined using Scanning Electron Microscopy (SEM) and X-ray powder diffraction (XRD) for phase identification of a crystalline material between peat and EPP relationships. The analyzed material composition shows crystallization process occurs between peat and EPP filled the void that presents in peat soils and reduced the voids. It was found that peat soil mixed with EPP and cement has a smoother surface texture and is less porous and voids, In contrast to the controlled sample, there are more voids present in the surface imaging.

Peat Soil Compaction Characteristic and Physicochemical Changes Treated with Eco-Processed Pozzolan (EPP)

“…This finding is in line with the statement of the previous study, which is that EPP can potentially help reduce the shrinkage by almost 66.66% [38]. These improvements were identified as the phase of a crystalline material between peat and EPP relationships as discovered by Suhaimi & Mohamad [39], who observed crystalline structure in the presence of EPP and cement in peat soil. The set of reflections proves unambiguously that Eco Processed Pozzolan (EPP) contributed to peat soil stabilization.…”

A Study on Linear Shrinkage Behavior of Peat Soil Stabilized with Eco-Processed Pozzolan (EPP)

“…There are various previous studies using this technique for the strengthening of soft soils. The efficacy of EPP has been exemplified in a recent study by Suhaimi & Mohamad [11], which verified that peat soil combined with EPP and cement as a binder will remarkably improve settling demeanor, resulting in minimal settling over time. In support to Suhaimi & Mohamad [11], Kho [12] study has shown that with the help of several superplasticizers, the insertion of recycled pozzolan, Eco Process Pozzolan (EPP), as a partial cement replacement in concrete has been demonstrated to be practical and effective, producing high consistency and strength outcomes.…”

Characteristic and Physicochemical Properties of Peat Soil Stabilized with Sodium Hydroxide (NaOH)

“…In this study, it is identified as a crystallization process and visibly shown to attach to peat particles, as consistently shown in Figures 4-b, 4-c, and 4-d. The crystallization process occurred when a chemical substance attached to the peat particle, as described previously [27,28]. The morphologies of samples stabilized with NaOH demonstrate additional hydration with fewer microcracks.…”