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
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/ http://umpir.ump.edu.my/id/eprint/26710/ http://umpir.ump.edu.my/id/eprint/26710/ http://umpir.ump.edu.my/id/eprint/26710/1/Stabilization%20of%20silty%20sand%20using%20bentonite%20magnesium-alkalinization%20.pdf

id	ump-26710
recordtype	eprints
spelling	ump-267102020-03-05T06:10:07Z 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 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 https://doi.org/10.1016/j.clay.2019.105325 https://doi.org/10.1016/j.clay.2019.105325
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	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/ http://umpir.ump.edu.my/id/eprint/26710/ http://umpir.ump.edu.my/id/eprint/26710/ http://umpir.ump.edu.my/id/eprint/26710/1/Stabilization%20of%20silty%20sand%20using%20bentonite%20magnesium-alkalinization%20.pdf
first_indexed	2023-09-18T22:41:45Z
last_indexed	2023-09-18T22:41:45Z
_version_	1777416961190264832

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

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