In-situ monitoring of pH and Cl- concentration and rebar corrosion at the rebar/mortar interface | |
Wang, Yuanxia1,2,3; Liu, Nazhen1,2; Liu, Xiangju1,2; Liu, Xinyu1,2,3; Sun, Congtao1,2; Chen, Xuwei3; Hou, Baorong1,2 | |
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. |
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