Utilization of Alkali-Activated Olivine in Soil Stabilization and the Effect of Carbonation on Unconfined Compressive Strength and Microstructure

Mohammad Hamed Fasihnikoutalab, Afshin Asadi, Cise Unuler, Bujang Kim Huat, Richard J. Ball, Saharam Pourakbar

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Abstract

This paper reports for the first time the stabilization of soil using olivine and the application of novel techniques utilizing alkaline activation and carbonation. A rigorous study addressed the effect of carbon dioxide pressure and alkali concentration (10-M sodium hydroxide soil additions from 5 to 20%) between 7 and 90 days. Microstructural and compositional changes were evaluated using microscopic, spectroscopic, and diffraction techniques. Results demonstrate the advantages of using olivine in the presence of NaOH and the associated increases insoil shear strength of up to 40% over 90 days. Samples subjected to carbonation for a further 7 days led to additional increases in soil strength of up to 60%. Microstructural investigations before and after carbonation attributed the strength development to the formation of Mg(OH)2, hydrated magnesium carbonates, and M─S─H, A─S─H gel phases. The impact of this work is far reaching and provides a new soil stabilization approach. Key advantages include significant improvements in soil strength with a lower carbon footprint compared with lime or cement stabilization.
LanguageEnglish
Article number06017002
Number of pages11
JournalASCE Journal of Materials in Civil Engineering
Volume29
Issue number6
Early online date24 Jan 2017
DOIs
StatusPublished - 1 Jun 2017

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Olivine
Carbonation
Alkalies
Compressive strength
Stabilization
Soils
Microstructure
Carbon footprint
Sodium Hydroxide
Carbon Dioxide
Lime
Shear strength
Magnesium
Carbonates
Carbon dioxide
Cements
Gels
Diffraction
Chemical activation
Sodium

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Utilization of Alkali-Activated Olivine in Soil Stabilization and the Effect of Carbonation on Unconfined Compressive Strength and Microstructure. / Fasihnikoutalab, Mohammad Hamed; Asadi, Afshin; Unuler, Cise; Huat, Bujang Kim; Ball, Richard J.; Pourakbar, Saharam.

In: ASCE Journal of Materials in Civil Engineering, Vol. 29, No. 6, 06017002, 01.06.2017.

Research output: Contribution to journalArticle

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