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.
Original language | English |
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Article number | 06017002 |
Number of pages | 11 |
Journal | ASCE Journal of Materials in Civil Engineering |
Volume | 29 |
Issue number | 6 |
Early online date | 24 Jan 2017 |
DOIs | |
Publication status | Published - 30 Jun 2017 |
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Richard Ball
- Department of Architecture & Civil Engineering - Reader
- Centre for Sustainable Chemical Technologies (CSCT)
- Centre for Integrated Materials, Processes & Structures (IMPS)
- Centre for Climate Adaptation & Environment Research (CAER)
- Centre for Regenerative Design & Engineering for a Net Positive World (RENEW)
Person: Research & Teaching, Core staff, Affiliate staff