In-situ monitoring of pH and Cl- concentration and rebar corrosion at the rebar/mortar interface

doi:10.1016/j.conbuildmat.2023.132712

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	In-situ monitoring of pH and Cl- concentration and rebar corrosion at the rebar/mortar interface
	Wang, Yuanxia 1,2,3; Liu, Nazhen 1,2; Liu, Xiangju 1,2; Liu, Xinyu 1,2,3; Sun, Congtao 1,2; Chen, Xuwei 3; Hou, Baorong 1,2
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2023-10-12
卷号	400 页码:9
关键词	Mortar Rebar corrosion Electrochemical sensors Membrane potential
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2023.132712
通讯作者	Liu, Nazhen(liunazhen@qdio.ac.cn) ; Chen, Xuwei(chenxuwei@mail.neu.edu.cn)
英文摘要	This study performed in-situ monitoring of pH and [Cl-] in pore water near the rebar/mortar interface using embedded electrochemical sensors (i.e., IrOx and Ag/AgCl electrodes). Membrane potential (Emembrane), which is the potential difference across the mortar/bulk electrolyte interface, was found to bring significant errors in determining pH and [Cl- ]. These errors could be eliminated by measuring the potential of the sensors against the home-made-embedded reference electrode. In a long-term immersion experiment, the corrosion of steel rebar was recorded using electrochemical impedance spectroscopy. Results showed that over the 75 days of immersion experiment, [Cl- ] in pore water near the rebar/mortar interface increased from 0.005 mol & BULL;L-1 (at day 2) to 1.37 mol & BULL;L-1, while pH decreased from 13.4 to 11.5. With the evolution of [Cl-] and pH, the corrosion of steel surface was accelerated due to passive film breakdown. The "passive to active" transition occurred when [Cl-] was & GE;0.25 mol & BULL;L-1 and pH was & LE;12.1.
资助项目	National Natural Science Foundation of China[51901222] ; National Natural Science Foundation of China[41827805] ; CAS Pioneer Hundred Talents Program
WOS关键词	GALVANIC-SENSOR-SYSTEM ; FLY-ASH ; CONCRETE ; STEEL ; REINFORCEMENT ; CARBONATION ; BEHAVIOR ; CHLORIDE ; DAMAGE ; OXIDE
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:001058738900001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/182933]
专题	海洋研究所_海洋腐蚀与防护研究发展中心
通讯作者	Liu, Nazhen; Chen, Xuwei
作者单位	1.Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Marine Corros & Protect, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China 3.Northeastern Univ, Coll Sci, Res Ctr Analyt Sci, Dept Chem, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yuanxia,Liu, Nazhen,Liu, Xiangju,et al. In-situ monitoring of pH and Cl- concentration and rebar corrosion at the rebar/mortar interface[J]. CONSTRUCTION AND BUILDING MATERIALS,2023,400:9.
APA	Wang, Yuanxia.,Liu, Nazhen.,Liu, Xiangju.,Liu, Xinyu.,Sun, Congtao.,...&Hou, Baorong.(2023).In-situ monitoring of pH and Cl- concentration and rebar corrosion at the rebar/mortar interface.CONSTRUCTION AND BUILDING MATERIALS,400,9.
MLA	Wang, Yuanxia,et al."In-situ monitoring of pH and Cl- concentration and rebar corrosion at the rebar/mortar interface".CONSTRUCTION AND BUILDING MATERIALS 400(2023):9.