海水环境粉煤灰混凝土结构耐久性现场检测与评估分析
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摘要
对服役12年的华南某跨海大桥典型构件开展碳化性能、氯离子扩散性能等指标的耐久性检测,评估了海水环境下掺粉煤灰的高性能混凝土长期耐久性。研究表明:随高程的增加混凝土碳化深度逐渐增大,其中大气区>浪溅区>水位变动区,碳化作用对粉煤灰混凝土结构耐久性的影响较小;粉煤灰可显著提升实体结构混凝土抗氯离子侵蚀性能,粉煤灰高性能混凝土的氯离子扩散系数不大于0.40×10-12m2/s,比普通混凝土氯离子扩散系数降低了约6倍;利用规范计算了引桥承台混凝土中氯离子含量计算值,其计算值与实测值吻合较好,可用于实体工程混凝土结构的耐久性评估,评估结果显示采用粉煤灰高性能的桥梁典型构件满足100年设计使用寿命的要求。
The durability of the carbonization-resisting and chloride ion diffusion property typical components of a cross-sea bridge in the south of China was evaluated at 12 years service life. Results show that the carbonization depth of concrete increases with the increase of height level,and that atmospheric zone >splash zone >tidal zone. Carbonation has little effect on the durability of fly ash concrete structures. Fly ash can significantly improve the resistance to chloride ion erosion of concrete. The chlorine ion diffusion coefficient of fly ash concrete is not greater than 0.40×10-12 m2/s,and is reduced by 6 times that of ordinary concrete. The calculation value of chloride ion content in concrete bridge abutment is calculated by using specifications. The calculated value agrees well with the measured value,and can be used to evaluate the durability of concrete structures. The evaluation results show that the typical components of the bridge with high performance fly ash meet the requirements of the design service life of 100 years.
The durability of the carbonization-resisting and chloride ion diffusion property typical components of a cross-sea bridge in the south of China was evaluated at 12 years service life. Results show that the carbonization depth of concrete increases with the increase of height level,and that atmospheric zone >splash zone >tidal zone. Carbonation has little effect on the durability of fly ash concrete structures. Fly ash can significantly improve the resistance to chloride ion erosion of concrete. The chlorine ion diffusion coefficient of fly ash concrete is not greater than 0.40×10-12 m2/s,and is reduced by 6 times that of ordinary concrete. The calculation value of chloride ion content in concrete bridge abutment is calculated by using specifications. The calculated value agrees well with the measured value,and can be used to evaluate the durability of concrete structures. The evaluation results show that the typical components of the bridge with high performance fly ash meet the requirements of the design service life of 100 years.
引文
[1]潘德强,洪定海,郑恩惠,等.华南沿海部分码头调查情况介绍[J].水运工程,1982(2):1-7.(PAN Deqiang,HONG Dinghai,ZHENG Enhui. Investigation information of South China coastal part pier[J]. Port&Waterway Engineering,1982(2):1-7.(in Chinese))
[2]交通部四航局科研所,南京水利科学研究所.华南海港钢筋混凝土码头锈蚀破坏调查报告[R]. 1981.(The Institute of the Fourth Harbour Engineering Bureau,Nanjing Institute of Water Conservancy Science. Investigation report on corrosion damage of reinforced concrete wharf in south China seaport[R]. 1981.(in Chinese))
[3]广州四航工程技术研究院.港口工程结构设计使用年限调查专题研究报告[R]. 2004.(CCCC Fourth Harbor Engineering Institute Co.,Ltd. Special research report on the service life of port structure design[R]. 2004.(in Chinese))
[4]王胜年,潘德强,卫淑珊,等.大掺量粉煤灰高性能混凝土的研究与应用[J].中国港湾建设,1999(4):20-23.(WANG Shengnian,PAN Deqiang,WEI Shusan,et al. Investigation and application of a high performance concrete[J]. China Harbour Engineering,1999(4):20-23.(in Chinese))
[5]赵摇晖,张亚梅,明摇静.海工码头结构混凝土耐久性检测与评估[J].水利水运工程学报,2013(5):54-60.(ZHAO Hui,ZHANG Yamei,MING Jing. Tests and evaluation of structural concrete durability at Ningbo marine wharf[J]. Hydro&Science and Engineering,2013(5):54-60.(in Chinese))
[6]陈肇元.高强与高性能混凝土的发展及研究[J].土木工程学报,1997,30(5):3-11.(CHEN Zhaoyuan. Development and research of high strength and high performance concrete[J]. China Civil Engineering Journal,1997,30(5):3-11.(in Chinese))
[7]宋华,牛荻涛,李春晖.矿物掺合料混凝土碳化性能试验研究[J].硅酸盐学报,2009,37(12):2066-2070.(SONG Hua,NIU Ditao,LI Chunhui. Carbonation test of concrete containing mineral admintures[J]. Journal of the Chinese Ceramic Society,2009,37(12):2066-2070.(in Chinese))
[8]赵庆新,齐立剑,潘慧敏.基于混凝土碳化耐久性的粉煤灰临界掺量[J].建筑材料学报,2015,18(2):118-122.(ZHAO Qingxin,QI Lijian,PAN Huimin. Critical use level of fly ash based on the carbonation durability of concrete[J]. Journal of Building Materials,2015,18(2):118-122.(in Chinese))
[9]王传坤,高祥杰,赵羽习.混凝土表层氯离子含量峰值分布和对流区深度[J].硅酸盐通报,2010,29(4):262-267.(WANG Chuankun,GAO Xiangjie,ZHAO Yuxi,et al. Peak value distribution of surface chloride concentration and convection depth of concrete[J]. Bulletion of the Chinese Ceramic Society,2010,29(4):262-267.(in Chinese))
[10]范宏,赵铁军,田砾,等.暴露26年后的混凝土的碳化和氯离子的分布[J].工业建筑,2006,36(8):50-53.(FAN Hong,ZHAO Tiejun,TIAN Li,et al. Carbonation and chloride distribution of concrete after 26 year-exposure[J]. Industrial Construction,2006,36(8):50-53.(in Chinese))
[11] The European Union-Brite EuRam III,BE 95-1347 General guidelines for durability design and redesign[S]. Duracrete,2000.
[12] YANG Haicheng,FAN Zhihong,WANG Shengnian. In situ study of chloride ingress in concretes containing fly ash exposed to marine environment[C]//Proceedings of the 37thCement and Concrete Science Conference. 2017.
[13]杨海成,杜安民,范志宏,等.温度对混凝土氯离子扩散性能的影响[J].水运工程,2015(10):20-26.(YANG Haicheng,DU Anmin,FAN Zhihong,et al. Influence of exposure temperature on chloride diffusion in concrete[J]. Port&Waterway Engineering,2015(10):20-26.(in Chinese))
[14]杨绿峰,周明,陈正.海洋混凝土结构耐久性定量分析与设计[J].土木工程学报,2014,47(10):70-79.(YANG Lufeng,ZHOU Ming,CHEN Zheng. Quantitative analysis and design for durability of marine concrete structures[J]. China Civil Engineering Journal,2014,47(10):70-79.(in Chinese))
[2]交通部四航局科研所,南京水利科学研究所.华南海港钢筋混凝土码头锈蚀破坏调查报告[R]. 1981.(The Institute of the Fourth Harbour Engineering Bureau,Nanjing Institute of Water Conservancy Science. Investigation report on corrosion damage of reinforced concrete wharf in south China seaport[R]. 1981.(in Chinese))
[3]广州四航工程技术研究院.港口工程结构设计使用年限调查专题研究报告[R]. 2004.(CCCC Fourth Harbor Engineering Institute Co.,Ltd. Special research report on the service life of port structure design[R]. 2004.(in Chinese))
[4]王胜年,潘德强,卫淑珊,等.大掺量粉煤灰高性能混凝土的研究与应用[J].中国港湾建设,1999(4):20-23.(WANG Shengnian,PAN Deqiang,WEI Shusan,et al. Investigation and application of a high performance concrete[J]. China Harbour Engineering,1999(4):20-23.(in Chinese))
[5]赵摇晖,张亚梅,明摇静.海工码头结构混凝土耐久性检测与评估[J].水利水运工程学报,2013(5):54-60.(ZHAO Hui,ZHANG Yamei,MING Jing. Tests and evaluation of structural concrete durability at Ningbo marine wharf[J]. Hydro&Science and Engineering,2013(5):54-60.(in Chinese))
[6]陈肇元.高强与高性能混凝土的发展及研究[J].土木工程学报,1997,30(5):3-11.(CHEN Zhaoyuan. Development and research of high strength and high performance concrete[J]. China Civil Engineering Journal,1997,30(5):3-11.(in Chinese))
[7]宋华,牛荻涛,李春晖.矿物掺合料混凝土碳化性能试验研究[J].硅酸盐学报,2009,37(12):2066-2070.(SONG Hua,NIU Ditao,LI Chunhui. Carbonation test of concrete containing mineral admintures[J]. Journal of the Chinese Ceramic Society,2009,37(12):2066-2070.(in Chinese))
[8]赵庆新,齐立剑,潘慧敏.基于混凝土碳化耐久性的粉煤灰临界掺量[J].建筑材料学报,2015,18(2):118-122.(ZHAO Qingxin,QI Lijian,PAN Huimin. Critical use level of fly ash based on the carbonation durability of concrete[J]. Journal of Building Materials,2015,18(2):118-122.(in Chinese))
[9]王传坤,高祥杰,赵羽习.混凝土表层氯离子含量峰值分布和对流区深度[J].硅酸盐通报,2010,29(4):262-267.(WANG Chuankun,GAO Xiangjie,ZHAO Yuxi,et al. Peak value distribution of surface chloride concentration and convection depth of concrete[J]. Bulletion of the Chinese Ceramic Society,2010,29(4):262-267.(in Chinese))
[10]范宏,赵铁军,田砾,等.暴露26年后的混凝土的碳化和氯离子的分布[J].工业建筑,2006,36(8):50-53.(FAN Hong,ZHAO Tiejun,TIAN Li,et al. Carbonation and chloride distribution of concrete after 26 year-exposure[J]. Industrial Construction,2006,36(8):50-53.(in Chinese))
[11] The European Union-Brite EuRam III,BE 95-1347 General guidelines for durability design and redesign[S]. Duracrete,2000.
[12] YANG Haicheng,FAN Zhihong,WANG Shengnian. In situ study of chloride ingress in concretes containing fly ash exposed to marine environment[C]//Proceedings of the 37thCement and Concrete Science Conference. 2017.
[13]杨海成,杜安民,范志宏,等.温度对混凝土氯离子扩散性能的影响[J].水运工程,2015(10):20-26.(YANG Haicheng,DU Anmin,FAN Zhihong,et al. Influence of exposure temperature on chloride diffusion in concrete[J]. Port&Waterway Engineering,2015(10):20-26.(in Chinese))
[14]杨绿峰,周明,陈正.海洋混凝土结构耐久性定量分析与设计[J].土木工程学报,2014,47(10):70-79.(YANG Lufeng,ZHOU Ming,CHEN Zheng. Quantitative analysis and design for durability of marine concrete structures[J]. China Civil Engineering Journal,2014,47(10):70-79.(in Chinese))