火灾受损混凝土再碱化修复过程中的导电原理分析

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发布时间：2021-09-25

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火灾受损混凝土再碱化修复过程中的
导电原理分析
熊焱，屈文俊，张翔
(1．华南理工大学亚热带建筑科学国家重点实验室，广东广州 510640；2．同济大学土木工程学院，
上海 200092；3．同济大学建筑设计研究院(集团)有限公司，上海 200092)
摘要：将电化学再碱化应用于火灾受损后的混凝土结构，全面、深入地分析了再碱化对火灾受损后
中性化混凝土碱性环境修复的机理；在此基础上对再碱化修复过程中各离子的迁移状况进行了研
究；推导了各离子迁移数的理论模型，得到了再碱化过程中 OH一和 Na 浓度比与其迁移数的关
系，并对再碱化修复过程中的导电原理做了分析研究。结果表明：电化学再碱化对中性化混凝土碱
性环境的修复机理是电解、电渗、扩散和毛细管虹吸等共同作用的结果。该研究为实现电化学再碱
化的控制提供了基础性理论依据。
关键词：再碱化修复；火灾；混凝土；离子迁移；导电原理
中图分类号：TU352．1 文献标志码：A
Analysis of Conductivity M echanism of Realkalization
Repair on Fire Damaged Concrete
XIONG Yan ，QU Wen一}un ，ZH ANG Xiang。
(1．State Key Laboratory of Subtropical Building Science，South China University of Technology，Guangzhou
5 10640，Guangdong，China；2．Department of Civil Engineering，Tongii University，Shanghai 200092，
China：3． Architectural Design and Research Institute of Tongii University (Group)Co．，Ltd．，
Shanghai 200092，China)
Abstract： Electrochemical realkalization was introduced and applied in fire dam aged concrete
structure．Based on an in—depth analysis of repair m echanism of restoring alkaline environm ent of
fire damaged neutral concrete by realkalization technique， the behaviors of ionic transfer in the
process of realkalization repair were studied． The theoretical model of ionic transfer quantity was
derived．and the relations between concentration ratio and transference numbers of 0H — and Na
during the realkalization were obtained． M oreover，the conductivity m echanism of realkalization
repair was initially explored． The results show that the repair mechanism s of electrochem ical
realkalization for neutral concrete alkaline environment include electrochemistry，electroosmosis，
diffusion and siphonage，etc． The research provides theoretical basis for the control theory of
electrochem ical reaIka1ization．
Key words：realkalization repair；fire；concrete；ionic transfer；conductivity m echanism