Journal Published Online: 22 March 2013
Volume 36, Issue 3

Preliminary Laboratory-Scale Model Auger Installation and Testing of Carbonated Soil-MgO Columns

CODEN: GTJODJ

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.

Author Information

Yi, Yaolin
Institute of Geotechnical Engineering, Southeast University, Nanjing, CN
Liska, Martin
David Ball Group, Cambridge, GB
Akinyugha, Akinyemi
Dept. of Engineering, Univ. of Cambridge, Cambridge, GB
Unluer, Cise
Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, US
Al-Tabbaa, Abir
Dept. of Engineering, Univ. of Cambridge, Cambridge, GB
Pages: 10
Price: $25.00
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Details
Stock #: GTJ20120052
ISSN: 0149-6115
DOI: 10.1520/GTJ20120052