电化学除氯对钢筋腐蚀状态及其周围混凝土微观结构的影响

doi:10.11896/cldb.23070258

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Abstract In this work, using the current densities of 1 A/m², 2 A/m² and 3 A/m² to carry out electrochemical chlorine extraction (ECE) treatment for 30 days on concrete with different water-cement ratios (0.47, 0.38, 0.33), the corrosion state of steel bars, chlorine extraction efficiency and residual chloride concentration distribution were obtained to evaluate the effect of ECE treatment. Througth scanning electron microscopy, X-ray diffraction and nuclear magnetic resonance test methods, explored the evolution rule of concrete hydration products and pore structure before and after ECE treatment. The results show that ECE treatment can prevent steel corrosion or restore passivation. The increase of the water-cement ratio and the current density would significantly increase the chlorine extraction efficiency of ECE. After ECE treatment, the content of Ca(OH)₂ in concrete increased, and Ca(OH)₂ crystals could fill the pores, so that the density of concrete near the anode increased and the porosity reduced, while the hydration products in concrete near the cathode were decomposed, resulting in porosity. After ECE treatment, the micropores (0.001—0.1 μm) in the concrete at the cathode evolved into mesopores (0.1—1 μm), which was unfavorable to the bond performance of steel-concrete.

Key words： electrochemical chlorine extraction reinforced concrete chloride ion concentration distribution nuclear magnetic resonance linear polarization

Published: 10 December 2024 Online: 2024-12-10

CLC number:

TU528

Fund:National Natural Science Foundation of China (52208249, U21A20150, 52208292), Youth Science and Technology Foundation of Gansu Province (22JR5RA288), Natural Science Innovation Foundation of Gansu Higher Education Institutions (2022CYZC-25), Research and Demonstration of Key Technologies of Green and Smart Highways in Gansu Province (21ZD3GA002),and Research on Key Technologies of Durability Repair of Highway Concrete Bridges, State Key Laboratory of High Performance Civil Engineering Materials (2022CEM009).

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	CHEN Wenlong
	ZHOU Xudong
	ZHANG Yu
	ZHANG Yunsheng
	MA Zhicong

Cite this article:

CHEN Wenlong,ZHOU Xudong,ZHANG Yu, et al. Effect of Electrochemically Chlorine Extraction on the Corrosion State of Steel Bars and the Microstructure of Surrounding Concrete[J]. Materials Reports, 2024, 38(23): 23070258-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23070258 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23070258

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