CUED Publications database

Preliminary laboratory-scale model auger installation and testing of carbonated soil-MgO columns

Yi, Y and Liska, M and Akinyugha, A and Unluer, C and Al-Tabbaa, A (2013) Preliminary laboratory-scale model auger installation and testing of carbonated soil-MgO columns. Geotechnical Testing Journal, 36. ISSN 0149-6115

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Abstract

This paper presents details of the installation and performance of carbonated soil-MgO columns using a laboratory-scale model auger setup. MgO grout was mixed with the soil using the auger and the columns were then carbonated with gaseous CO2 introduced in two different ways: one using auger mixing and the other through a perforated plastic tube system inserted into the treated column. The performance of the columns in terms of unconfined compressive strength (UCS), stiffness, strain at failure and microstructure (using X-ray diffraction and scanning electron microscopy) showed that the soil-MgO columns were carbonated very quickly (in under 1 h) and yielded relatively high strength values, of 2.4-9.4 MPa, which on average were five times that of corresponding 28-day ambient cured uncarbonated columns. This confirmed, together with observations of dense microstructure and hydrated magnesium carbonates, that a good degree of carbonation had taken place. The results also showed that the carbonation method and period have a significant effect on the resulting performance, with the carbonation through the perforated pipe producing the best results. Copyright © 2013 by ASTM International.

Item Type: Article
Uncontrolled Keywords: Carbonation Column installation MgO Microstructure Soil mixing Soil stabilisation Unconfined compressive strength
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:28
Last Modified: 08 Dec 2014 02:18
DOI: 10.1520/GTJ20120052