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The effect of electrochemical chloride extraction on pre-stressed concrete

机译：电化学氯化物萃取对预应力混凝土的影响

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摘要

Chloride induced corrosion is the main cause of corrosion in reinforced concrete structures. Electrochemical chloride extraction, also known as desalination, is applied to concrete structures containing ordinary reinforcement in order to extract chlorides from the concrete. During this process, atomic hydrogen generated on the steel surface can cause hydrogen embrittlement of the steel. High strength steels, such as those that are used in pre-stressed concrete, are particularly susceptible to hydrogen embrittlement which, at worst, can result in the sudden and unpredictable collapse of a structure. This paper presents the results of a series of constant extension rate tests conducted on 22 pre-stressed concrete specimens that had been subjected to electrochemical chloride extraction. The paper concludes that the risk of hydrogen induced brittle fracture due to electrochemical chloride extraction cannot be altered with modification of the treatment parameters, such as current density or treatment duration. It was also uninfluenced by different surface states of the steel (corroded or not corroded). Therefore, based on the findings of this study, it can be concluded that electrochemical chloride extraction should not be applied to pre-stressed concrete.
机译：氯化物引起的腐蚀是钢筋混凝土结构腐蚀的主要原因。电化学氯化物提取（也称为脱盐）应用于包含普通增强剂的混凝土结构，以便从混凝土中提取氯化物。在此过程中，钢表面产生的原子氢会引起钢的氢脆化。高强度钢，例如用于预应力混凝土中的钢，特别容易发生氢脆，最坏的情况是会导致结构突然而无法预测的坍塌。本文介绍了对经过电化学氯化物萃取的22个预应力混凝土试样进行的一系列恒定伸长率测试的结果。本文的结论是，由于电化学氯化物萃取而导致的氢致脆性断裂的风险不能随处理参数（例如电流密度或处理持续时间）的改变而改变。它也不受钢的不同表面状态（腐蚀或未腐蚀）的影响。因此，根据这项研究的结果，可以得出结论，电化学氯化物萃取不应应用于预应力混凝土。

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