|Table of Contents|

Experiment on Free Chloride Diffusion Coefficient of Concrete Exposed to Marine Environment(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2011年04期
Page:
86-91
Research Field:
Publishing date:
2011-12-20

Info

Title:
Experiment on Free Chloride Diffusion Coefficient of Concrete Exposed to Marine Environment
Author(s):
LU Yi-ting1;  YU Hong-fa1;  MA Hao-xia1;  HU Die2
1. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China; 2. Nanjing Liankan Technology Co. Ltd, Nanjing 210019, Jiangsu, China
Keywords:
concrete;  curing age;  natural diffusion method;  mineral admixture;  free chloride diffusion coefficient;  time dependence
PACS:
TU528.041
DOI:
-
Abstract:
The chloride diffusion characteristics of ordinary Portland concrete, fly ash concrete and slag concrete exposed to substitute ocean water were investigated, and influences of curing age, exposing time and content of mineral admixture on free chloride diffusion coefficients of concrete were discussed by using the natural diffusion method. Results show that free chloride diffusion coefficients of concrete exponentially decrease with exposing time, and time dependence is related to curing age and content of mineral admixture. When curing age can reach 730 d, and contents(mass proportions)of fly ash and slag can reach 30% and 45% respectively, free chloride diffusion coefficients of concrete reduce most quickly with exposing time. Therefore, extending curing age and adding fly ash and slag have such a great impact on reduction of long-term free chloride diffusion coefficient of concrete.

References:

[1] MEHTA P K.Durability-critical Issues for the Future[J].Concrete International,1997,19(7):27-33.
[2]卢 木.混凝土耐久性研究现状和研究方向[J].工业建筑,1997,27(5):1-6,52. LU Mu.Recent Study and Research Directions of Concrete Durability[J].Industrial Construction,1997,27(5):1-6,52.
[3]洪乃丰.氯盐环境中混凝土耐久性与全寿命经济分析[J].混凝土,2005(8):29-32,39. HONG Nai-feng.Concrete Durability in Chloride Environment and Life-cycle Costing Analysis[J].Concrete,2005(8):29-32,39.
[4]CUSSON D,LOUNIS Z,DAIGLE L.Benefits of Internal Curing on Service Life and Life-cycle Cost of High-performance Concrete Bridge Decks—a Case Study[J].Cement and Concrete Composites,2010,32(5):339-350.
[5]AMEY S L,JOHNSON D A,MILTENBERGER M A,et al.Predicting the Service Life of Concrete Mar-ine Structures:an Environmental Methodology[J].Structural Journal,1998,95(1):27-36.
[6]AUDENAERT K,YUAN Q,DE SCHUTTER G.On the Time Dependency of the Chloride Migration Coefficient in Concrete[J].Construction and Building Materials,2010,24(3):396-402.
[7]施惠生,王 琼.混凝土中氯离子迁移的影响因素研究[J].建筑材料学报,2004,7(3):286-290. SHI Hui-sheng,WANG Qiong.Research on the Factors Influencing on the Chloride Ingression in Concrete[J].Journal of Building Materials,2004,7(3):286-290.
[8]PACK S W,JUNG M S,SONG H W,et al.Prediction of Time Dependent Chloride Transport in Concrete Structures Exposed to a Marine Environment[J].Cement and Concrete Research,2010,40(2):302-312.
[9]NOKKEN M,BODDY A,HOOTON R D,et al.Time Dependent Diffusion in Concrete—Three Laboratory Studies[J].Cement and Concrete Research,2006,36(1):200-207.
[10]TANG L,NILSSON L O.Chloride Diffusivity in High Strength Concrete at Different Ages[J].Nordic Concrete Research,1992,11(1):162-170.
[11]MANGAT P S,MOLLOY B T.Prediction of Long Term Chloride Concentration in Concrete[J].Mater-ials and Structures,1994,27(6):338-346.
[12]THOMAS M D A,BAMFORTH P B.Modeling Chloride Diffusion in Concrete—Effect of Fly Ash and Slag[J].Cement and Concrete Research,1999,29(4):487-495.
[13]胡 蝶.海水环境下混凝土氯离子扩散参数的规律性研究[D].南京:南京航空航天大学,2009. HU Die.Research on Chloride Diffusion Parameters of Concrete Exposed to Marine Environment[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2009.
[14]ASTM D 1141-2003,Standard Practice for the Prep-aration of Substitute Ocean Water[S].
[15]JTJ 270—98,水运工程混凝土试验规程[S]. JTJ 270—98,Testing Code of Concrete for Port and Waterwog Engineering[S].
[16]NILSSON L O,MASSAT M,TANG L.The Effect of Non-linear Chloride Binding on the Prediction of Chloride Penetration into Concrete Structures[C]//ACI.Durability of Concrete.Detroit:ACI,1994:469-486.
[17]余红发.盐湖地区高性能混凝土的耐久性、机理与使用寿命预测方法[D].南京:东南大学,2004. YU Hong-fa.Study on High Performance Concrete in Salt Lake:Durability,Mechanism and Service Life Prediction[D].Nanjing:Southeast University,2004.
[18]张巨松,邓 嫔,鞠里红,等.矿物掺合料混凝土早期氯离子扩散系数的试验[J].沈阳建筑大学学报:自然科学版.2009,25(2):312-315. ZHANG Ju-song,DENG Bin,JU Li-hong,et al.The Study on Chloride-ion-diffusion-coefficient of Concrete Mixed Mineral Admixture[J].Journal of Shen-yang Jianzhu University:Natural Science,2009,25(2):312-315.
[19]叶建雄,李晓筝,廖佳庆,等.矿物掺合料对混凝土氯离子渗透扩散性研究[J].重庆建筑大学学报,2005,27(3):89-92. YE Jian-xiong,LI Xiao-zheng,LIAO Jia-qing,et al.Study on Influence of Mineral Admixture on Chloride Ion Penetration and Diffusion in Concrete[J].Journal of Chongqing Jianzhu University,2005,27(3):89-92.
[20]原通鹏,邓德华,曾 志,等.矿物掺合料抗氯离子扩散性能的试验研究[J].混凝土,2005(11):60-62,70. YUAN Tong-peng,DENG De-hua,ZENG Zhi,et al.Experimental Study on Chloride-ion-resistance Diffusion of Mineral Admixture[J].Concrete,2005(11):60-62,70.
[21]干伟忠,王纪跃,BOES A.电化学排除钢筋混凝土结构氯盐污染的试验研究[J].中国公路学报,2003,16(3):44-47. GAN Wei-zhong,WANG Ji-yue,BOES A.Experimental Research on Electrochemical Removal of Chlor-ide in Reinforced Concrete Structure[J].China Journal of Highway and Transport,2003,16(3):44-47.
[22]赵尚传,贡金鑫,水金锋.弯曲荷载作用下水位变动区域混凝土中氯离子扩散规律试验[J].中国公路学报,2007,20(4):76-82. ZHAO Shang-chuan,GONG Jin-xin,SHUI Jin-feng.Test of Chloride Diffusion Rules in Concrete at Tidal Zone Under Flexural Load[J].China Journal of Highway and Transport,2007,20(4):76-82.
[23]李会艳.矿物掺和料对高性能混凝土性能的影响[J].筑路机械与施工机械化,2011,28(3):63-67. LI Hui-yan.Effect of Mineral Admixture on Performance of High Performance Concrete[J].Road Machinery & Construction Mechanization,2011,28(3):63-67.

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Last Update: 2011-12-20