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Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume

Peat is a renowned problematic soil and needs stabilization to enhance its engineering properties. Silica fume (SF) and Ordinary Portland Cement (OPC) were extensively adopted to increase the mechanical properties of peat; however, their microstructural analysis is lacking. Investigated herein is th...

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Autores principales: Ahmad, Afnan, Sutanto, Muslich Hartadi, Ahmad, Niraku Rosmawati, Mohamad, Mazizah Ezdiani, Bujang, Mastura
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9820821/
https://www.ncbi.nlm.nih.gov/pubmed/36614356
http://dx.doi.org/10.3390/ma16010018
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author Ahmad, Afnan
Sutanto, Muslich Hartadi
Ahmad, Niraku Rosmawati
Mohamad, Mazizah Ezdiani
Bujang, Mastura
author_facet Ahmad, Afnan
Sutanto, Muslich Hartadi
Ahmad, Niraku Rosmawati
Mohamad, Mazizah Ezdiani
Bujang, Mastura
author_sort Ahmad, Afnan
collection PubMed
description Peat is a renowned problematic soil and needs stabilization to enhance its engineering properties. Silica fume (SF) and Ordinary Portland Cement (OPC) were extensively adopted to increase the mechanical properties of peat; however, their microstructural analysis is lacking. Investigated herein is the microstructural evolution caused by the OPC and SF implementation in peat soil stabilization. Initially, the compositional analysis (elements and oxides) of peat and binders was carried out via energy-dispersive X-ray (EDX) and X-ray fluorescence (XRF). Subsequently, the microstructural changes that occurred in the stabilized peat were examined through a series of microstructural analyses. The analysis includes scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), and thermogravimetric analysis (TGA) for morphological, mineralogical, functional group analysis, and bond thermal analysis, respectively. The SEM micrographs evidence the transformation of loosely packed with large micropores of untreated peat into a compact dense peat matrix. This transformation is due to the formation of newly developed minerals, i.e., calcium hydrates (CH), calcium silicate hydrates (C-S-H), calcium aluminate hydrate (CAH), ettringite (Aft) caused by the pozzolanic reaction of binders as recorded by the XRD. Similarly, different molecular functional groups were found in the FTIR analysis with the incorporation of SF and OPC. Finally, the percentage of mass loss was assessed through TGA analysis revealing the decomposition of stabilized in the second and third stages.
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spelling pubmed-98208212023-01-07 Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume Ahmad, Afnan Sutanto, Muslich Hartadi Ahmad, Niraku Rosmawati Mohamad, Mazizah Ezdiani Bujang, Mastura Materials (Basel) Article Peat is a renowned problematic soil and needs stabilization to enhance its engineering properties. Silica fume (SF) and Ordinary Portland Cement (OPC) were extensively adopted to increase the mechanical properties of peat; however, their microstructural analysis is lacking. Investigated herein is the microstructural evolution caused by the OPC and SF implementation in peat soil stabilization. Initially, the compositional analysis (elements and oxides) of peat and binders was carried out via energy-dispersive X-ray (EDX) and X-ray fluorescence (XRF). Subsequently, the microstructural changes that occurred in the stabilized peat were examined through a series of microstructural analyses. The analysis includes scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), and thermogravimetric analysis (TGA) for morphological, mineralogical, functional group analysis, and bond thermal analysis, respectively. The SEM micrographs evidence the transformation of loosely packed with large micropores of untreated peat into a compact dense peat matrix. This transformation is due to the formation of newly developed minerals, i.e., calcium hydrates (CH), calcium silicate hydrates (C-S-H), calcium aluminate hydrate (CAH), ettringite (Aft) caused by the pozzolanic reaction of binders as recorded by the XRD. Similarly, different molecular functional groups were found in the FTIR analysis with the incorporation of SF and OPC. Finally, the percentage of mass loss was assessed through TGA analysis revealing the decomposition of stabilized in the second and third stages. MDPI 2022-12-20 /pmc/articles/PMC9820821/ /pubmed/36614356 http://dx.doi.org/10.3390/ma16010018 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ahmad, Afnan
Sutanto, Muslich Hartadi
Ahmad, Niraku Rosmawati
Mohamad, Mazizah Ezdiani
Bujang, Mastura
Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume
title Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume
title_full Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume
title_fullStr Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume
title_full_unstemmed Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume
title_short Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume
title_sort microstructural characterization of fibric peat stabilized with portland cement and silica fume
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9820821/
https://www.ncbi.nlm.nih.gov/pubmed/36614356
http://dx.doi.org/10.3390/ma16010018
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