Affiliation:
1. University of Maine System
Abstract
Abstract
This paper reports for the first time the use and application of a novel technique in the characterization of mineral carbonation reaction and CO2 sequestration in soil stabilization using flow meters. Soils based on SiO2 with two different sizes were tested. Lime (Ca(OH)2) was used as the reactant. Instant CO2 flow rate (L/min), total CO2 volume (L), temperature (°C), and absolute pressure (kPa) were monitored and recorded for 1 hour by flow meters connected to the mold inlet and outlet. It was determined that the mineral carbonation reaction started in the first seconds and ended before the 5th minute. The mineral carbonation is a short-term and potential reaction, and it is not a time-dependent reaction. It is separated from other carbonation reactions with these characteristics. The highest CO2 captured value was obtained in the soil mixed with 5% lime, where fines were not used. The second highest CO2 captured value was obtained in soil mixed with 1% lime, where fines were not used. CO2 captured with 1% lime is more than CO2 captured with 5% lime in the soil containing fines. Accordingly, 1-5% lime can be used in soil carbonation studies. According to the soil properties, the highest CO2 captured and the CO2 efficiency was achieved with the use of 6-7% water by weight.
Publisher
Research Square Platform LLC
Reference41 articles.
1. Behaviour and mineralogy changes in lime-treated expansive soil at 20°C;Al-Mukhtar M;Appl Clay Sci,2010
2. Variation of microstructure with carbonation in lime and blended pastes;Arandigoyen M;Appl Surf Sci,2006
3. Stabilization of expansive soils using chemical additives: A review;Barman D;J Rock Mech Geotech Eng,2022
4. Lime stabilisation of clay minerals and soils;Bell FG;Eng Geol,1996
5. Bergado DT, Anderson LR, Miura N, Balasubramaniam AS (1996) Soft Ground improvement: In lowland and other environments. ASCE, New York