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Laboratory-scale model of carbon dioxide deposition for soilstabilisation

Journal of Rock Mechanics and Geotechnical Engineering 2016年第2期8卷 178-186页

作者： Mohammad Hamed Fasihnikoutalab Afshin Asadi Bujang Kim Huat PaulWestgate richard jball Shahram Pourakbar Department of Civil Engineering University Putra Malaysia43400 UPMSerdangSelangorMalaysia Housing Research Centre Department of Civil EngineeringUniversity Putra Malaysia43400 UPMSerdangSelangorMalaysia BRE Centre for Innovative Construction Materials Department of Architecture and Civil EngineeringUniversity of BathBathBA2 7AYUK

Olivine sand is a natural mineral,which,when added to soil,can improve the soil’s mechanical properties while also sequester carbon dioxide(CO2)from the surrounding *** originality of this paper stems from the novel two-stage *** the first stage,natural carbonation of olivine and carbonation of olivine treated soil under different CO2pressures and times were *** this stage,the unconfined compression test was used as a tool to evaluate the strength *** the second stage,details of the installation and performance of carbonated olivine columns using a laboratory-scale model were *** this respect,olivine was mixed with the natural soil using the auger and the columns were then carbonated with gaseous *** unconfined compressive strengths of soil in the first stage increased by up to 120% compared to those of the natural untreated *** strength development was found to be proportional to the CO2pressure and carbonation *** analyses indicated the presence of magnesite on the surface of carbonated olivinetreated soil,demonstrating that modified physical properties provided a stronger and stiffer *** performance of the carbonated olivine-soil columns,in terms of ultimate bearing capacity,showed that the carbonation procedure occurred rapidly and yielded a bearing capacity value of 120 k *** of this study are of significance to the construction industry as the feasibility of carbonated olivine for strengthening and stabilizing soil is *** applicability lies in a range of different geotechnical applications whilst also mitigates the global warming through the sequestration of CO2.

关键词： Olivine Soil stabilisation CO_2 deposition Climate change Unconfined compressive strength Microstructure analysis

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