强感潮环境混凝土氯离子扩散系数长期时变性
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摘要
以钱塘江强感潮河口环境下3种水灰比的普通水工混凝土耐久性暴露试验,结果表明:在开始的1~3年内,该环境条件下的水工混凝土氯离子扩散系数降低明显,1 500 d后降低的幅度和速率很小,并趋于稳定;得到的氯离子扩散系数的时变模型能较好地反映该环境条件下混凝土扩散性能的衰减过程。
According to the hydraulic concrete of ordinary beams with three different water cement ratios exposed to the strong tidal range in the Qiantang River,the results demonstrated that diffusion coefficients of chlorine ion of hydraulic concrete obviously reduced in the beginning 1~3 years,but the reduction and speed were very small and gradually remain stable after 1 500 days.The erosion of hydraulic concrete exposed to the strong tidal range can be well reflected by the model obtained.
According to the hydraulic concrete of ordinary beams with three different water cement ratios exposed to the strong tidal range in the Qiantang River,the results demonstrated that diffusion coefficients of chlorine ion of hydraulic concrete obviously reduced in the beginning 1~3 years,but the reduction and speed were very small and gradually remain stable after 1 500 days.The erosion of hydraulic concrete exposed to the strong tidal range can be well reflected by the model obtained.
引文
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[6]庄华夏.潮差区混凝土氯离子侵蚀试验及钢筋初锈时间研究[D].杭州:浙江工业大学,2014.
[7]水工混凝土试验规程:SL 352—2006[S].北京:中国水利水电出版社,2006.
[8]杨绿峰,胡春燕,陈正,等.混凝土中氯离子随机时变扩散过程及浓度分析[J].建筑材料学报,2013,16(2):210-216.
[9]TANG L,GULIKERS J.On the mathematics of time-dependent apparent chloride coefficient in concrete[J].Cement and Concrete Research,2007,37(4):589-595.
[10]伍亚玲,张俊芝,鲁列,等.人工气候环境下混凝土氯离子扩散系数衰减速率[J].混凝土,2013(3):26-28.
[2]LIANG M T,LIN L H,LIANG C H.Service life prediction of existing reinforced concrete bridges exposed to chloride environment[J].ASCE,Journal of Infrastructure System,2002,8(3):76-85.
[3]AMEY S L,JOHNSON D A,MILTENBERGER M A,et al.Predicting the service life of concrete marine structures:an environmental methodology[J].ACI,Structural Journal,1998,95(2):205-214.
[4]MANGAT P S,MOLLOY B T.Prediction of long term chloride concentration in concrete[J].Materials and Structure,1994,27(6):338-346.
[5]傅招旗.火成岩纤维混凝土及砂浆的抗侵蚀性能试验研究[D].杭州:浙江工业大学,2012.
[6]庄华夏.潮差区混凝土氯离子侵蚀试验及钢筋初锈时间研究[D].杭州:浙江工业大学,2014.
[7]水工混凝土试验规程:SL 352—2006[S].北京:中国水利水电出版社,2006.
[8]杨绿峰,胡春燕,陈正,等.混凝土中氯离子随机时变扩散过程及浓度分析[J].建筑材料学报,2013,16(2):210-216.
[9]TANG L,GULIKERS J.On the mathematics of time-dependent apparent chloride coefficient in concrete[J].Cement and Concrete Research,2007,37(4):589-595.
[10]伍亚玲,张俊芝,鲁列,等.人工气候环境下混凝土氯离子扩散系数衰减速率[J].混凝土,2013(3):26-28.