海水-淡水交汇处石灰石粉-偏高岭土复合胶凝材料体系的护筋性  

Rebar-Protecting Properties of Limestone Powder-Metakaolin Cementitious Materials System under Seawater-Freshwater Intermixed Environment

作　　者：余百炼 王雷冲 水中和[1,2] 余睿[1,2] 高旭 YU Bailian;WANG Leichong;SHUI Zhonghe;YU Rui;GAO Xu(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City,Zhongshan 310012,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学,硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]中山市武汉理工大学先进工程技术研究院,中山310012 [4]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《硅酸盐通报》2020年第10期3244-3251,共8页Bulletin of the Chinese Ceramic Society

基　　金：中山市武汉理工大学先进工程技术研究院开放课题(WHUT201902)。

摘　　要：为研究海水-淡水交汇处的特殊海水环境下石灰石粉(LS)-偏高岭土(MK)复合胶凝材料体系的护筋性能,设计了不同LS和MK质量比的复合胶凝材料,首先探究了上述体系的固氯能力与胶凝材料组成的内在联系,同时结合物相分析对该体系的固氯机理进行分析;其次研究了海水-淡水交汇处复掺LS-MK混凝土中氯离子的扩散行为特征;最后通过恒电压加速钢筋锈蚀实验以验证复合胶凝材料体系的护筋性能。结果表明:当LS和MK的总掺量为30%(质量分数),且LS/MK质量比由5∶1降至1∶1时,材料体系的固氯量先增后减;在海水-淡水交汇处,随着MK占比的提高,复掺LS-MK混凝土中氯离子扩散系数持续降低;MK占比的提高减少了钢筋锈蚀量,降低了复掺LS-MK混凝土中钢筋的锈蚀风险。In order to study the rebar-protecting properties in limestone powder(LS)-metakaolin(MK)cemetitious materials system under seawater-freshwater intermixed environment,cemetitious materials with different mass ratios of LS and MK were designed.Firstly,the relationship between the chloride binding capacity and cemetitious materials composition was explored,and the chloride binding mechanism was analyzed by phase identification.Then,the diffusion behavior of chloride ion in LS-MK concrete under seawater-freshwater intermixed environment was studied.Finally,the rebar-protecting properties in LS-MK cemetitious materials system were verified by constant voltage accelerated corrosion test.The results show that when the total content of LS and MK is 30%(mass fraction),and the mass ratio of LS/MK reduces from 5∶1 to 1∶1,the chloride binding capacity of the materials system firstly increases and then decreases.With the increase of the MK content,the chloride diffusion coefficient in the LS-MK concrete decreases,and the increase of the MK content reduces the amount of steel bar corrosion and the corrosion risk of the steel bar in the LS-MK concrete.

关 键 词：海水-淡水交汇处 石灰石粉 偏高岭土 氯离子固化 氯离子扩散 钢筋锈蚀 

分 类 号：TU528.36[建筑科学—建筑技术科学]