Abstract
Traditional MgO carbonation (MgO and gaseous CO2) is a promising and sustainable technique in construction fields. However, using this technique to treat in-field soils on a large scale presents problems associated with CO2 diffusion, carbonation conditions, and mixing processes. To address such problems, this study proposed a new method that used NaHCO3 as a CO2 carrier to carbonate MgO, and then the carbonated MgO is applied to treat soils. The engineering properties of the stabilized soil were investigated. A discussion on the technical and economic feasibility of this new method was followed. The results showed that the soil with MgO + NaHCO3 had better mechanical performance than that with OPC due to the formation of various magnesium carbonates. The new method would be more convenient to operate on-site than the traditional carbonation method and presented a strong economic potential for the soda industry. Overall, this method could be an upgrade to MgO carbonation.
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