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model investigation of the low-carbon MgO-treated soil foundation based on CO_(2) overall carbonation

Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 2901-2916页

作者： Guanghua Cai Songyu Liu Yuqing Zhong Chisun Poon Jiangshan Li School of Civil Engineering Nanjing Forestry UniversityNanjing210037China Institute of Geotechnical Engineering School of TransportationSoutheast UniversityNanjing211189China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong999077China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The overall carbonation of MgO-admixed soil provides not only an efficient and environmentally friendly technique for improving soft ground but also a permanently safe solution for CO_(2) *** evaluate the carbon sequestration potential and promote the carbonation application in soil improvement,a laboratory-scale model investigation is designed under pressurized carbonation considering the influences of MgO dosage and CO_(2) ventilation mode(way).The temperature,dynamic resilience modulus,and dynamic cone penetration(DCP)were tested to assess the carbonation treatment *** physical,strength,and microscopic tests were also undertaken to reveal the evolution mechanisms of CO_(2) migration in the MgO-carbonated *** results indicate that the temperature peaks of MgO-treated foundation emerge at w20 h during hydration,but occur at a distance of 0e25 cm from the gas source within 6 h during *** dynamic resilience moduli of the model foundation increase by more than two times after carbonation and the DCP indices reduce *** the distance from the gas inlet increases,the bearing capacity,strength,and carbon sequestration decrease,whereas the moisture content *** to the end ventilation,the middle ventilation produces a higher carbonation degree and a wider carbonation *** cementation and filling of nesquehonite and dypingite/hydromagnesite are verified to be critical factors for carbonation evolution and enhancing mechanical ***,the overall carbonation model is described schematically in three stages of CO_(2) *** outcomes would help to facilitate the practical application of CO_(2) sequestration in soil treatment.

关键词： model investigation Overall carbonation Reactive MgO Engineering properties Microscopic characteristics

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