Vickers hardness distribution and prediction model of cement pastes corroded by sulfate under the coexistence of electric field and chloride

doi:10.1016/j.conbuildmat.2021.125119

	Vickers hardness distribution and prediction model of cement pastes corroded by sulfate under the coexistence of electric field and chloride
	Chu, Hongqiang 2; Wang, Tao 2; Han, Lin 2; Cao, Li 2; Guo, Ming-Zhi 1,2; Liang, Yunchao 2; Jiang, Linhua 2
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2021-11-22
卷号	309 页码:11
关键词	Electric field Sulfate Chloride Vickers hardness Prediction model
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.125119
英文摘要	The durability of reinforced concrete structures in subway engineering is a continuing concern due to the longterm complications associated with the coexistence of sulfate, chloride and electric field. However, there remain challenges towards better characterizing the changes in the mechanical and durability of the influenced structures. In this study, the micro-Vickers hardness was measured to reflect the changes in the local mechanical properties of the cement pastes before and after sulfate erosion under the combined treatment of an electric field and chloride. The effect of the water-to-cement ratio, sulfate concentration, chloride concentration and current intensity on the Vickers hardness of cement paste was explored under the coupling effect of sulfate, chloride and electric field. Moreover, a Vickers hardness prediction model taking into account multiple factors was established by modifying the Logistic function. The results showed that increasing the water-cement ratio, the sulfate concentration and the current strength all led to a decrease in the Vickers hardness of the cement paste. Interestingly, an increase in the chloride concentration alleviated the sulfate-induced decrease in the Vickers hardness, indicating that the existence of chloride delayed the sulfate attack, which was substantiated by the XRD results. There was a good correlation between the Vickers hardness prediction model and the experimental data. Therefore, the developed model is able to predict the changes in the Vickers hardness of the cement paste under the changes in the above mentioned factors with a high confidence.
资助项目	National Natural Science Foundation of China[51778209] ; National Natural Science Foundation of China[52079048] ; Fundamental Research Funds for the Central Universities[2019B16614] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z020012] ; China Postdoctoral Science Foundation[2018M632219]
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000708232600002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28496]
专题	中科院武汉岩土力学所
通讯作者	Guo, Ming-Zhi
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Hohai Univ, Coll Mech & Mat, Nanjing 210098, Peoples R China
推荐引用方式 GB/T 7714	Chu, Hongqiang,Wang, Tao,Han, Lin,et al. Vickers hardness distribution and prediction model of cement pastes corroded by sulfate under the coexistence of electric field and chloride[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,309:11.
APA	Chu, Hongqiang.,Wang, Tao.,Han, Lin.,Cao, Li.,Guo, Ming-Zhi.,...&Jiang, Linhua.(2021).Vickers hardness distribution and prediction model of cement pastes corroded by sulfate under the coexistence of electric field and chloride.CONSTRUCTION AND BUILDING MATERIALS,309,11.
MLA	Chu, Hongqiang,et al."Vickers hardness distribution and prediction model of cement pastes corroded by sulfate under the coexistence of electric field and chloride".CONSTRUCTION AND BUILDING MATERIALS 309(2021):11.