滨海环境安全壳混凝土氯离子侵蚀规律研究
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摘要
通过综合盐雾箱模拟滨海地区大气环境,采用安全壳同等级同配合比混凝土试件,经不同侵蚀时间,研究了盐雾环境下氯离子在安全壳混凝土中的扩散规律,并对Fick's第二扩散定律进行了修正。用修正模型进行数值分析,结果显示要让安全壳安全运行40年,则钢筋保护层厚度至少为51 mm;而想延寿至60年,则钢筋保护层厚度需要增加到56 mm。
Concrete specimens,with the same ratio of the containment concrete,were tested in salt spray test chamber which simulated the atmospheric environment in coastal area.The rule of diffusion of chloride ion into containment concrete had been discussed under different erosion time and improved Fick's second law.Using improved model for numerical analysis,the results showthat the thickness of cover should be at least 51 mm for the 40 years safe operation of the containment; if prolong life to 60 years,the thickness need to increase to 56 mm.
Concrete specimens,with the same ratio of the containment concrete,were tested in salt spray test chamber which simulated the atmospheric environment in coastal area.The rule of diffusion of chloride ion into containment concrete had been discussed under different erosion time and improved Fick's second law.Using improved model for numerical analysis,the results showthat the thickness of cover should be at least 51 mm for the 40 years safe operation of the containment; if prolong life to 60 years,the thickness need to increase to 56 mm.
引文
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[9]Building code requirements for structural concrete(ACI 318M-11)and commentary[Z].American Concrete Institute,USA,2011.
[2]JTJ 270—1998,水运工程混凝土试验规程[S].
[3]COLLEPARDI M,MARCIALIS A,TURRIZZANI R.The kinetics of penetration of chloride ions into the concrete[J].Cement and Concrete Research,1970(4):157-164.
[4]KASSIR M K,GHOSN M.Chloride-induced corrosion of reinforced concrete bridge decks[J].Cement and Concrete Research,2002,32(1):139-143.
[5]MAAGE M,HELLAND S,POULSEN E,et al.Service life prediction of existing concrete structures exposed to marine environment[J].ACI M ate J,1996,93(6):602-608.
[6]CCES 01—2004,混凝土结构耐久性设计与施工指南[S].2004.
[7]General guidelines for durability design and redesign[Z].DuraCrete,Feb,2000.
[8]余红发,孙伟.混凝土在多重因素作用下的氯离子扩散方程[J].建筑材料学报,2002,3(5):240-246.
[9]Building code requirements for structural concrete(ACI 318M-11)and commentary[Z].American Concrete Institute,USA,2011.