摘要
为了实现对钢筋混凝土试块的修复,采用基于电迁移原理的双向电渗技术研究试块保护层表面的强度变化规律.测量不同通电参数、水灰比、初始氯盐掺量、表面碳化情况下试块保护层的表面强度,并将其与电化学除氯后的试块进行比较,探究双向电渗对保护层表面强度的修复效果.采用压汞实验对试块保护层的孔隙结构进行研究,对比经过不同时长处理后试块保护层孔隙特征的变化.结果表明:试块在经过双向电渗处理后,保护层的表面强度降低,下降幅度随电流密度和通电时间的增加而增大;试件表面强度降低的程度与水灰比、初始氯盐质量分数以及表面碳化均存在相关性;保护层孔隙率下降程度较大,有害孔隙与无害孔隙均有减少.
Electromigration based bidirectional electromigration rehabilitation （BIEM） technology was used to study the changing rule of protective layer strength in reinforced concrete blocks for repair. The protective layer strength was measured under different electric parameters, water cement ratios, initial chloride salt contents and surface carbonation situations. The measured results were compared with those of blocks after electrochemical chloride extraction （ECE） to study the repair effect of BIEM on the protective layer strength. Mercury injection test was taken to study the pore structure distribution after electrochemical treatment. The results show that the protective layer strength decreases after BIEM, and the decrease amplitude increases with the increase of current density and treatment duration. Moreover, water cement ratio, initial chloride salt content and surface carbonation also affect the decrease of strength. Protective layer porosity decreases a lot, including both positive and negative pores.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2015年第6期1128-1138,共11页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学青年基金资助项目(51408534)
国家自然科学基金重大国际合作资助项目(50920105806)
浙江省自然科学青年基金资助项目(LQ14E080010)
质检总局公益性科研资助项目(201210229-2)
杭州市科技计划资助项目(20140533B42
20131831K31)
杭州市重大科技创新专项资助项目(20142011A41)
关键词
双向电渗(BIEM)
混凝土
阻锈剂
表面强度
电化学除氯(ECE)
bidirectional electromigration rehabilitation （BIEM）
concrete
corrosion inhibitor
surfacestrength
electrochemical chloride extraction （ECE）
