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Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization

This paper investigates the mechanical, physicochemical, and microstructural characterization of treated silty sand using a novel additive. The additive from a mixture of bentonite, magnesium chloride, and alkaline solution was introduced for stabilization of soil. Atterberg limits, compaction, pH,...

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Main Authors: Nurmunira, Muhammad, Siddiqua, Sumi
Format: Article
Language:English
English
Published: Elsevier Ltd. 2019
Subjects:
TA Engineering (General). Civil engineering (General)
TE Highway engineering. Roads and pavements
Online Access:http://umpir.ump.edu.my/id/eprint/26710/1/Stabilization%20of%20silty%20sand%20using%20bentonite%20magnesium-alkalinization%20.pdf
http://umpir.ump.edu.my/id/eprint/26710/7/Stabilization%20of%20silty%20sand%20using%20bentonite%E2%80%91magnesium-alkalinization-%20Mechanical%2C%20physicochemical%20and%20microstructural%20characterization.pdf
http://umpir.ump.edu.my/id/eprint/26710/
https://doi.org/10.1016/j.clay.2019.105325
https://doi.org/10.1016/j.clay.2019.105325
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spelling my.ump.umpir.267102023-07-27T03:41:29Z http://umpir.ump.edu.my/id/eprint/26710/ Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization Nurmunira, Muhammad Siddiqua, Sumi TA Engineering (General). Civil engineering (General) TE Highway engineering. Roads and pavements This paper investigates the mechanical, physicochemical, and microstructural characterization of treated silty sand using a novel additive. The additive from a mixture of bentonite, magnesium chloride, and alkaline solution was introduced for stabilization of soil. Atterberg limits, compaction, pH, and unconfined compressive strength (UCS) tests were used to assess the mechanical and physicochemical properties of the stabilized soil. Further investigation results on the optimum designed sample are discussed based on microstructural analysis using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). Two curing types: unheated and heated at 60 °C for 24 h, were observed at 7, 14, 28 and 60 days in ambient temperature. Overall, it was found that the chemical additive improved the compressive strength of the soil and the heated curing tests showed significant strength improvement. The mechanical and physicochemical results revealed an optimum mix to improve silty sand strength using the addition of 40% bentonite with an alkaline activator (SS/SH) ratio of 0.5, an alkaline activator-to-MgCl2 (L/S) ratio of 0.7, and 3% MgCl2 by dry weight of the soil under heat curing condition at 60 °C for 24 h. The microstructure analysis confirmed the formation of the cementitious products, such as calcium aluminium silicate hydrate (C-(A)-S-H) and magnesium silicate hydrate (M-S-H) in the treated sample. Elsevier Ltd. 2019-10-31 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/26710/1/Stabilization%20of%20silty%20sand%20using%20bentonite%20magnesium-alkalinization%20.pdf pdf en http://umpir.ump.edu.my/id/eprint/26710/7/Stabilization%20of%20silty%20sand%20using%20bentonite%E2%80%91magnesium-alkalinization-%20Mechanical%2C%20physicochemical%20and%20microstructural%20characterization.pdf Nurmunira, Muhammad and Siddiqua, Sumi (2019) Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization. Applied Clay Science, 183 (105325). pp. 1-12. ISSN 0169-1317. (Published) https://doi.org/10.1016/j.clay.2019.105325 https://doi.org/10.1016/j.clay.2019.105325
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
English
topic TA Engineering (General). Civil engineering (General)
TE Highway engineering. Roads and pavements
spellingShingle TA Engineering (General). Civil engineering (General)
TE Highway engineering. Roads and pavements
Nurmunira, Muhammad
Siddiqua, Sumi
Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
description This paper investigates the mechanical, physicochemical, and microstructural characterization of treated silty sand using a novel additive. The additive from a mixture of bentonite, magnesium chloride, and alkaline solution was introduced for stabilization of soil. Atterberg limits, compaction, pH, and unconfined compressive strength (UCS) tests were used to assess the mechanical and physicochemical properties of the stabilized soil. Further investigation results on the optimum designed sample are discussed based on microstructural analysis using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). Two curing types: unheated and heated at 60 °C for 24 h, were observed at 7, 14, 28 and 60 days in ambient temperature. Overall, it was found that the chemical additive improved the compressive strength of the soil and the heated curing tests showed significant strength improvement. The mechanical and physicochemical results revealed an optimum mix to improve silty sand strength using the addition of 40% bentonite with an alkaline activator (SS/SH) ratio of 0.5, an alkaline activator-to-MgCl2 (L/S) ratio of 0.7, and 3% MgCl2 by dry weight of the soil under heat curing condition at 60 °C for 24 h. The microstructure analysis confirmed the formation of the cementitious products, such as calcium aluminium silicate hydrate (C-(A)-S-H) and magnesium silicate hydrate (M-S-H) in the treated sample.
format Article
author Nurmunira, Muhammad
Siddiqua, Sumi
author_facet Nurmunira, Muhammad
Siddiqua, Sumi
author_sort Nurmunira, Muhammad
title Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
title_short Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
title_full Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
title_fullStr Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
title_full_unstemmed Stabilization of silty sand using bentonite magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
title_sort stabilization of silty sand using bentonite magnesium-alkalinization: mechanical, physicochemical and microstructural characterization
publisher Elsevier Ltd.
publishDate 2019
url http://umpir.ump.edu.my/id/eprint/26710/1/Stabilization%20of%20silty%20sand%20using%20bentonite%20magnesium-alkalinization%20.pdf
http://umpir.ump.edu.my/id/eprint/26710/7/Stabilization%20of%20silty%20sand%20using%20bentonite%E2%80%91magnesium-alkalinization-%20Mechanical%2C%20physicochemical%20and%20microstructural%20characterization.pdf
http://umpir.ump.edu.my/id/eprint/26710/
https://doi.org/10.1016/j.clay.2019.105325
https://doi.org/10.1016/j.clay.2019.105325
_version_ 1772811325748019200
score 13.211869

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