Abstract Different sizes of Metakaolin (MK) were introduced into epoxy resin emulsion concrete mortar (EECM) to improve mechanical and anticorrosion properties. The effects of MK contents and sizes on the mechanical property, water absorption and chloride diffusion coefficient of EECM were studied respectively. Electrochemical tests were used to measure corrosion rate of samples. The results showed MK could greatly enhance the mechanical properties of EECM and more content MK obtained higher strength. The smaller size MK caused a slight decrease in strength due to poor dispersion in EECM. The water absorption and chloride diffusion coefficient of EECM both decreased significantly after adding MK. The smaller size of MK with 400-mesh and 1250-mesh made the water absorption reduced approximately 51%. The chloride diffusion coefficient of EECM also reduced with the increasing of MK content, especially the largest decline 73.1% corresponds to 1250-mesh MK. The data in polarization curves and EIS curves coincide with the above conclusion. The larger size of MK had the better anticorrosion effect on steel bar than that with smaller size. The corrosion situation on the surface of steel bars in mortar supplied the realistic anticorrosion effect.

中文翻译：

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偏高岭土对环氧乳液水泥砂浆力学性能和防腐性能的影响

摘要 在环氧树脂乳液混凝土砂浆（EECM）中加入不同粒径的偏高岭土（MK），以提高其力学性能和防腐性能。分别研究了MK含量和粒径对EECM力学性能、吸水率和氯化物扩散系数的影响。电化学测试用于测量样品的腐蚀速率。结果表明，MK可以大大提高EECM的力学性能，MK含量越多，强度越高。由于 EECM 的分散性差，较小尺寸的 MK 导致强度略有下降。加入MK后EECM的吸水率和氯化物扩散系数均显着降低。400目和1250目MK的较小尺寸使吸水率降低约51%。EECM的氯化物扩散系数也随着MK含量的增加而降低，尤其是下降幅度最大的73.1%对应于1250目MK。极化曲线和EIS曲线中的数据与上述结论一致。较大尺寸的MK对钢筋的防腐效果优于较小尺寸的MK。钢筋表面在砂浆中的腐蚀情况提供了逼真的防腐效果。