A Study on Factors Affecting Strength of Solidified Peat through XRD and FESEM Analysis

4th International Conference on Civil and Environmental Engineering for Sustainability

地球科学;生态环境科学;经济学

Rahman, J.A.^1 ; Napia, A.M.A.^1 ; Nazri, M.A.A.^1 ; Mohamed, R.M.S.R.^1 ; Al-Geethi, A.S.^1

Faculty of Civil Engineering and Environment, Universiti Tun Hussein Onn, Johor, Malaysia^1

关键词: Bottom ash;    Deformation Characteristics;    Field emission scanning electron microscopes;    Literature reviews;    Mixing formulations;    Peat samples;    Soft soils;    Unconfined compressive strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/140/1/012059/pdf
DOI  :  10.1088/1755-1315/140/1/012059

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Peat is soft soil that often causes multiple problems to construction. Peat has low shear strength and high deformation characteristics. Thus, peat soil needs to be stabilized or treated. Study on peat stabilization has been conducted for decades with various admixtures and mixing formulations. This project intends to provide an overview of the solidification of peat soil and the factors that affecting the strength of solidified peat soil. Three types of peats which are fabric, hemic and sapric were used in this study to understand the differences on the effect. The understanding of the factors affecting strength of solidified peat in this study is limited to XRD and FESEM analysis only. Peat samples were collected at Pontian, Johor and Parit Raja, Johor. Peat soil was solidified using fly ash, bottom ash and Portland cement with two mixing formulation following literature review. The solidified peat were cured for 7 days, 14 days, 28 days and 56 days. All samples were tested using Unconfined Compressive Strength Test (UCS), X-ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM). The compressive strength test of solidified peat had shown consistently increase of sheer strength, qufor Mixing 1 while decrease of its compressive strength value for Mixing 2. All samples were tested and compared for each curing days. Through XRD, it is found that all solidified peat are dominated with pargasite and richterite. The highest quis Fabric Mixing 1(FM1) with the value of 105.94 kPa. This sample were proven contain pargasite. Samples with high quwere observed to be having fly ash and bottom ash bound together with the help of pargasite. Sample with decreasing strength showed less amount of pargasite in it. In can be concluded that XRD and FESEM findings are in line with UCS values.