| 摘要: |
| 用电化学试验、抗折强度测试、压汞试验、X射线衍射等研究了氯盐-硫酸盐侵蚀下煤系偏高岭土（CMK）对水泥砂浆及其内部钢筋耐侵蚀性能的影响.结果表明：CMK水泥砂浆保护层能够降低钢筋的锈蚀程度和锈蚀速率，推迟钢筋发生点蚀破坏的时间，提高钢筋的耐锈蚀性能；CMK的掺入减小了氯盐-硫酸盐侵蚀下水泥砂浆的膨胀率及其抗折强度损失； CMK能够细化水泥砂浆的孔隙结构，抑制水泥净浆在氯盐-硫酸盐侵蚀过程中石膏、钙矾石等侵蚀产物的生成. |
| 关键词: 氯盐-硫酸盐侵蚀 煤系偏高岭土 水泥砂浆 钢筋 锈蚀 膨胀率 电化学 |
| DOI：10.3969/j.issn.1007-9629.2022.05.002 |
| 分类号:TU528.33 |
| 基金项目:内蒙古大学高层次人才科研启动项目；国家自然科学基金资助项目（51578099） |
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| Corrosion Resistance to Chloride and Sulfate Salt Attack of Steel Bar-Cement Mortar Containing Coal Metakaolin |
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LI Chuang1, FAN Yingfang2, WANG Yaoyu2, LI Qiuchao2
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1.Transportation Institute， Inner Mongolia University， Hohhot 010070， China;2.College of Transportation Engineering， Dalian Maritime University， Dalian 116026， China
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| Abstract: |
| Effects of coal metakaolin （CMK） on corrosion resistance of cement mortar and its internal steel bar under chloride and sulfate attack were characterized by electrochemistry， flexural strength test， mercury injection and X-ray diffraction. The results show that CMK cement mortar cover can reduce the corrosion degree and corrosion rate of steel bars， delay the time of pitting damage and improve the corrosion resistance of steel bar. The addition of CMK reduces the expansion ratio and the flexural strength loss of cement mortar during the process of chloride and sulfate attack. CMK can refine the pore structure of cement mortar， inhibit the formation of gypsum， ettringite and other erosion products in cement paste. |
| Key words: chloride and sulfate attack coal metakaolin cement mortar steel bar corrosion expansion ratio electrochemistry |
