CUED Publications database

Initial investigation into the carbonation of MgO for soil stabilisation

Yi, YL and Liska, M and Unluer, C and Al-Tabbaa, A (2013) Initial investigation into the carbonation of MgO for soil stabilisation. In: UNSPECIFIED pp. 2641-2644..

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While Portland cement (PC) is the most widely used binder for soil stabilisation, there are significant environmental impacts associated with its production in terms of high energy consumption and CO emission. Hence, the development of new low carbon foot-print alternative cements has been encouraged. In this paper, reactive magnesia (MgO) was used as a soil stabilisation binder and the MgO-stabilised soils were carbonated by gaseous CO to improve the mechanical properties of the soil and reduce the CO emission. The mechanical and microstructural properties of the carbonated MgO stabilised soils were investigated by using unconfined compressive testing, x-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the strength development rates of carbonated MgO-stabilised soils were much faster than those PC- and MgO-stabilised soils, and the unconfined compressive strength of highly carbonated MgO-stabilised soils was close to that of 28-day ambient cured PC-stabilised soils. The XRD and SEM results indicated that nesquehonite (MgCO 3H O) was the main product of the carbonated MgO-stabilised soils and responsible for the significant strength development. 2 2 2 3 2

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 06 Feb 2018 01:24
Last Modified: 15 Apr 2021 06:03