改性珊瑚混凝土中2205不锈钢钢筋的耐蚀性研究  

Corrosion Resistance of 2205 Stainless Steel Bar in Modified Coral Concretes

作　　者：冯兴国[1] 顾卓然 范琦琦 卢向雨 杨雅师 FENG Xingguo;GU Zhuoran;FAN Qiqi;LU Xiangyu;YANG Yashi(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210024,China;School of Hydraulic Engineering,Wanjiang University of Technology,Maanshan 243000,China)

机构地区：[1]河海大学港口海岸与近海工程学院,南京210024 [2]皖江工学院水利工程学院,马鞍山243000

出　　处：《中国腐蚀与防护学报》2024年第3期789-796,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2022YFB3207400);中央高校科研业务费专项(TKS20220601)。

摘　　要：对比了直接掺入粉煤灰、水泥浆或水泥-偏高岭土复合浆增强处理珊瑚粗骨料等改性方案对珊瑚混凝土中2205不锈钢钢筋腐蚀速率的影响。结果表明,珊瑚混凝土中2205不锈钢钢筋长期处于钝化状态;掺入粉煤灰可降低2205不锈钢钢筋腐蚀速率,但直接掺入的粉煤灰会引起珊瑚混凝土强度明显下降。采用P.O 52.5水泥浆或P.O 52.5水泥+偏高岭土复合浆增强珊瑚粗骨料,再用增强粗骨料制备的珊瑚混凝土强度与对照组试样强度差异较小,但骨料增强的珊瑚混凝土中2205不锈钢钢筋腐蚀速率明显降低,采用P.O 52.5水泥+偏高岭土复合浆增强粗骨料的试样中2205不锈钢钢筋腐蚀速率最低。综合考虑,P.O 52.5水泥+偏高岭土复合浆增强珊瑚粗骨料,其制备的珊瑚混凝土具有较高强度,2205不锈钢钢筋的腐蚀速率最低,这种复合浆增强珊瑚粗骨料方案是提高不锈钢钢筋珊瑚混凝土结构耐久性的有效途径。The effect of different modification schemes for strengthening the coral coarse aggregate,namely direct incorporation of fly ash,cement slurry or cement-metakaolin composite slurry,on the corrosion rate of 2205 stainless steel bars in the coral concretes was comparatively assessed so that to search insight the way to improve the durability of stainless steel reinforced coral concrete structure.The results show that the 2205 stainless steel bar always maintained a passivation state in the coral concrete.The incorporation of fly ash can reduce the corrosion rate of 2205 stainless steel bar,but the direct addition of fly ash may significantly decrease the strength of coral concrete.With P.O 52.5 cement slurry or P.O 52.5 cement-metakaolin composite slurry as modifier can strengthen coral coarse aggregate,but the strength of coral concrete prepared with the modified crude aggregate has little difference with that of the control group,while the corrosion rate of 2205 stainless steel bar in the coral concrete strengthened with the coarse aggregate is significantly reduced.Among others,the corrosion rate of 2205 stainless steel bar is the lowest in the concrete of coarse aggregate reinforced with P.O 52.5 cement-metakaolin composite slurry In conclusion,using P.O 52.5 cement-metakaolin composite slurry to enhance coral coarse aggregate can effectively improve the durability of stainless steel reinforced coral concrete structures by providing high strength and greatly reducing the corrosion rate of 2205 stainless steel bar.

关 键 词：珊瑚混凝土 不锈钢钢筋 粉煤灰 粗骨料增强 腐蚀速率 

分 类 号：TU511[建筑科学—建筑技术科学]