Wang Wei, Lu Caifeng
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu, 221116, China; Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, 221116, China; Department of Architecture, Faculty of Engineering, The University of Tokyo, Tokyo, 113-8654, Japan.
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu, 221116, China; Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, 221116, China; JiangSu Collaborative Innovation Center for Building Energy Saving and Construct Technology, Xuzhou, 221008, China.
J Hazard Mater. 2018 Oct 15;360:520-528. doi: 10.1016/j.jhazmat.2018.08.007. Epub 2018 Aug 6.
Whereas steel bar corrosion is the main cause for durability deterioration of existing reinforced concrete structures, it is important to understand the steel bar corrosion in concrete and predict the corrosion process in a sufficient way. In this paper, the corrosion process of rebar in ordinary concrete and three types of fly ash concrete specimens casted with 15%, 30% and 45% fly ash replacement ratios by mass under constant climate conditions were investigated. Meanwhile, the advanced digital video microscope measure system was used to study the microstructure of the steel/concrete interface at the different stages of corrosion. The effects of fly ash replacement were analyzed in terms of the electrical resistivity of concrete and the corrosion rate in the corrosion process of steel bars in fly ash concrete. The results showed that the resistivity of concrete increased with an increase in fly ash replacement, and the corrosion rate declined with the fly ash replacement increases. In addition, in fly ash concrete, the corrosion rate of plain bars were obviously smaller than that of ribbed bars.
鉴于钢筋腐蚀是现有钢筋混凝土结构耐久性劣化的主要原因，充分了解混凝土中的钢筋腐蚀情况并预测腐蚀过程非常重要。本文研究了在恒定气候条件下，普通混凝土以及分别以15%、30%和45%的质量比替代粉煤灰浇筑的三种粉煤灰混凝土试件中钢筋的腐蚀过程。同时，采用先进的数字视频显微镜测量系统研究了腐蚀不同阶段钢/混凝土界面的微观结构。从混凝土的电阻率和粉煤灰混凝土中钢筋腐蚀过程中的腐蚀速率方面分析了粉煤灰替代的影响。结果表明，混凝土的电阻率随粉煤灰替代量的增加而增大，腐蚀速率随粉煤灰替代量的增加而降低。此外，在粉煤灰混凝土中，光圆钢筋的腐蚀速率明显小于带肋钢筋。
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