Freezing-thawing performance of reactive MgO-admixed silty clay subjected to forced carbonation

doi:10.1016/j.coldregions.2021.103330

	Freezing-thawing performance of reactive MgO-admixed silty clay subjected to forced carbonation
	Cai, Guanghua 2,3,4; Liu, Songyu 3; Zheng, Xu 3; Zou, Haifeng 1; Shao, Guanghui 4; Li, Jiangshan 2
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2021-09-01
卷号	189 页码:12
关键词	Silty clay Reactive MgO Forced carbonation Freezing-thawing durability Engineering performance
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2021.103330
英文摘要	The freezing-thawing (F-T) durability of reactive MgO-admixed silty clay subjected to the forced carbonation has not been deeply understood despite the satisfactory engineering performance. A set of physical and mechanical tests as well as micro analyses were conducted to explore the engineering and microstructural features of MgO-carbonated silty clay after the cyclical F-T. The research outcomes indicated that the weight change rates of MgO-carbonated silty clay showed a fluctuating change under the increasing F-T cycle, but the water content, density and dry density almost remained stable. The strengths, deformation moduli and durability indexes of MgO-carbonated specimens decreased by -0.8 MPa, -100 MPa and 0.17 respectively after 2-8 F-T cycles. Nevertheless, the strengths were still more than twice as high as those of Portland cement (PC)-solidified specimens. The repeated F-T cycles had almost no influence on the carbonation products and crystalline morphologies of MgO-carbonated silty clay, but the dense aggregates were divided into loose fragments. The cumulative pore volumes of MgO-carbonated samples had some increase of about 0.015 mL/g after the F-T exposure, and the pore-volume distribution turned into a three-peak curve after ten F-T cycles. Besides, the volumes of the total pore, macro pore and large pore had great increase after F-T cycles, while the volumes of other pores decreased. These findings showed a relatively good F-T durability of MgO-carbonated silty clay, and would be beneficial for facilitating the application of MgO carbonation in the soil improvement of cold regions.
资助项目	National Natural Science Foundation of China[41902286] ; National Natural Science Foundation of China[41972269] ; Open Fund for State Key Laboratory of Geotechnical Mechanics and Engineering[Z019026] ; Natural Science Foundation of the Jiangsu Higher Education Institutions of China[18KJB560012] ; Open Fund of State Key Laboratory of Frozen Soil Engineering[SKLFSE201806]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000732708600006
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/30880]
专题	中科院武汉岩土力学所
通讯作者	Cai, Guanghua; Liu, Songyu
作者单位	1.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geotech Mech & Engn, Wuhan 430071, Peoples R China 3.Southeast Univ, Inst Geotech Engn, Nanjing 211189, Peoples R China 4.Nanjing Forestry Univ, Coll Civil Engn, 159 Longpan Rd, Nanjing 210037, Peoples R China
推荐引用方式 GB/T 7714	Cai, Guanghua,Liu, Songyu,Zheng, Xu,et al. Freezing-thawing performance of reactive MgO-admixed silty clay subjected to forced carbonation[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2021,189:12.
APA	Cai, Guanghua,Liu, Songyu,Zheng, Xu,Zou, Haifeng,Shao, Guanghui,&Li, Jiangshan.(2021).Freezing-thawing performance of reactive MgO-admixed silty clay subjected to forced carbonation.COLD REGIONS SCIENCE AND TECHNOLOGY,189,12.
MLA	Cai, Guanghua,et al."Freezing-thawing performance of reactive MgO-admixed silty clay subjected to forced carbonation".COLD REGIONS SCIENCE AND TECHNOLOGY 189(2021):12.