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

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

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Abstract

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.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Calcium bentonite; Magnesium chloride; Chemical stabilization; Silty sand Heat curing; XRD
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TE Highway engineering. Roads and pavements
Faculty/Division: Faculty of Civil Engineering & Earth Resources
Institute of Postgraduate Studies
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 05 Mar 2020 06:10
Last Modified: 05 Mar 2020 06:10
URI: http://umpir.ump.edu.my/id/eprint/26710
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