Effects of Drying-Wetting Cycles on Durability of Carbonated Reactive Magnesia-Admixed Clayey Soil
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 11
Abstract
The durability of -carbonated reactive magnesia (MgO)-admixed clayey soils against drying-wetting cycles has not been well understood now despite the fact that the engineering properties of -carbonated MgO-admixed soils have been extensively investigated in previous studies. This paper presents the details of a study of the effects of drying-wetting (D-W) cycles on the physical, chemical, mechanical, and microstructural properties of -carbonated MgO-admixed clayey soils, and ordinary portland cement (PC)-stabilized soils used as a control sample for comparison. The results indicate that compared with PC-stabilized soils, the soundness ranks and pH of -carbonated MgO-admixed clayey soils have varying degrees of decline after drying-wetting cycles and -carbonated MgO-admixed clay has a higher mass change ratio and water content than carbonated MgO-admixed silty clay. The residual strength ratios of -carbonated MgO-admixed and PC-stabilized clay were 0.35 and 0.65, respectively, whereas the residual strength of -carbonated MgO-admixed silty clay still was higher than that of PC-stabilized silty clay, although their residual strength ratios both were above 0.8. The elasticity modulus of -carbonated MgO-admixed clay decreased from 260 to 100 MPa after one drying-wetting cycle and was less than that of -carbonated MgO-admixed silty clay (), showing weaker and better durability against drying-wetting cycles of -carbonated MgO-admixed clay and of silty clay, respectively. Microstructural analyses confirmed the physical, chemical, and mechanical results.
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Acknowledgments
This work was financially supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (18KJB560012), the Youth Science and Technology Innovation Fund of Nanjing Forestry University (CX2018005), the High-Level Talent Research Fund of Nanjing Forestry University (GXL2018028), the Science and Technology Project of Jiangsu Traffic Engineering Construction Bureau (2018T01), the Basic Research Project of Central University (2242019k30039), the National Natural Science Foundation of China (41330641), and the Ministry of Housing and Urban-Rural Development Science and Technology Project Plan (2018-K7-013).
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Journal of Materials in Civil Engineering
Volume 31 • Issue 11 • November 2019
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©2019 American Society of Civil Engineers.
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Received: Jul 23, 2018
Accepted: Jun 5, 2019
Published online: Aug 29, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 29, 2020
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