海洋环境条件下不同结构区域混凝土耐久性研究

赵晖; 张亚梅; 明静

doi:10.13204/j.gyjz201307020

海洋环境条件下不同结构区域混凝土耐久性研究

doi: 10.13204/j.gyjz201307020

1.
1. 金陵科技学院建筑工程学院,南京211169;
2.
2. 东南大学材料科学与工程学院,南京210001

基金项目:

金陵科技学院博士启动科技项目(JIT 40610042)

详细信息

作者简介:
第一作者：赵晖, 男, 1970年出生, 博士(后)。电子信箱：njzhaohui@163.com

中图分类号: U654
计量
- 文章访问数: 157
- HTML全文浏览量: 13
- PDF下载量: 72
- 被引次数: 0
出版历程
- 收稿日期: 2012-09-07
- 刊出日期: 2013-07-20

STUDY ON CONCRETE DURABILITY OF DIFFERENCE STRUCTURAL REGIONS UNDER MARINE ENVIRONMENT

1.
1. Architectural Engineering Institute,Jinling Institute of Technology,Nanjing 211169,China;
2.
2. School of Materials Science and Engineering,Southeast University,Nanjing 210001,China

摘要

摘要: 为了研究不同结构区域混凝土的损伤特性和劣化机理，对宁波某海工码头板梁(大气区)、横梁(潮汐区)和方桩(水下区)等结构区域混凝土外观、力学性能、碳化深度、自由氯离子含量分布、表观氯离子扩散系数、碱含量和钢筋保护层厚度进行检测。研究结果表明，大气区和潮汐区结构混凝土强度状态较好，水下区结构混凝土强度状态较差，混凝土碳化深度和钢筋保护层厚度Dne/Dnd分布规律为大气区；潮汐区；水下区，混凝土表面氯离子浓度、表观氯离子扩散系数(Da)和碱含量分布规律是水下区；潮汐区；大气区，CO2侵蚀作用导致大气区混凝土钢筋保护层劣化，有害介质氯离子与CO2侵蚀共同作用引起潮汐区混凝土钢筋锈蚀和钢筋保护层劣化，有害介质氯离子与盐分渗透进混凝土内部，结构混凝土高浓度碱与氯离子耦合作用加速水下区混凝土钢筋锈蚀速度，导致钢筋保护层劣化。
- 海洋环境 /
- 结构区域 /
- 耐久性 /
- 研究
Abstract: In order to study the damage characteristics and deterioration mechanism of concrete in difference structural regions, the appearance, mechanical properties, carbonation depth, distribution of free chloride content, apparent chloride ion diffusion coefficient, alkali content and the cover thickness of concrete for plate girder(atmosphere zone), cross beam(tidal zone) and square pile(underwater zone), at the typical region of a marine dock in Ningbo, were tested.The test data show that the structural concrete in the atmosphere and tidal zone have a better compressive strength state, while concrete in underwater zone has a poor compressive strength state, the carbonation depth and Dne/Dnd of the cover thickness are decreased from upper part to lower part, atmosphere zonetidal zoneunderwater zone, the distribution law of free chloride content, apparent chloride diffusion coefficient(Da) and alkali content of concrete are underwater zone tidal zoneatmosphere zone.The conclusions are drawn that CO2 of erosion action at atmosphere zone results in deterioration of the cover thickness, the combined action of harmful chloride ion and CO2 erosion lead to steel corrosion and deterioration of cover thickness at the tidal zone, due to the chloride ion and salt permeate into concrete of underwater zone, the coupling effect of chloride ion and high salt concentration accelerate the deterioration of cover thickness at the underwater zone.
- marine environment /
- structural region /
- durability /
- research

HTML全文

参考文献(16)

[2] Bryant Mather.Concrete Durability[J].Cement and Composites.2004(26):3－4.

Liu Bingjing.Durability Design of Concrete Structures [M].Beijing: China Communications Press,2007,127.

[3] 唐明述.中国水泥混凝土发展现状与展望[J].东南大学学报:自然科学版,2006(36):1－6.

[4] 孙伟.荷载与环境因素藕合作用下结构混凝土的耐久性与服役寿命[J].东南大学学报:自然科学版,2006(36):7－14.

[5] Alexander M G, Ballim Y, Stanish K.A Framework for Use of?Durability Indexes in Performance Based Design and Specifications?for Reinforced Concrete Structures[J].Materials and Structures [J].2008(41),921－936.

[6] 仲伟秋,贡盒鑫.氯离子侵蚀环境下混凝土结构的耐久性评估[J].混凝土,2002(11):3－4.

[7] 林宝玉,单国良.南方海港浪溅区钢筋混凝土耐久性研究[J].水运工程,1998(1):1－5.

[8] 李顺凯,刘可心,秦明强,等.基于现场耐久性检测的承台海工混凝土寿命预测[J].混凝土,2008(11):117－119.

[9] 王景贤.既有结构混凝土中碱含量的检测[J].建材技术与运用,2009(3):3－5.

[10] JTT /TJ 21201公路桥梁承载能力检测评定规程[S].

[11] 陈道普.风对混凝土碳化速度影响的研究[D].上海:同济大学,2006.

[12] 陈浩宇,余红发,刘连新,等.混凝土在海洋环境和除冰盐条件下的氯离子扩散行为[J].华中科技大学学报:城市科学版,2005(9):48－52.

[13] Luping T, Andersen A.Chloride Ingress Data from Five Years Field?Exposure in a Swedish Marine Environment[C]∥ Proceedings of?2nd International RILEM Workshop on Testing and Modeling the?Chloride Ingressin to Concrete.Paris:2000.

[14] CECS 53∶93混凝土碱含量限值标准[S].

[15] Berube M A, Dorion J, Duchesne J, et al.Laboratory and Field?Investigations of the Influence of Sodium Chloride on Alkali-Silica?Reactivity[J].Cement and Concrete Research,2003(33):77－84.

[16] Sibbick R G.Mechanism Affecting the Development of Alkali-Slica?Reaction Hardened Concretes Exposed to Saline Environments[J].Magazine of Concrete Research,1998,50(144):147－159.

施引文献

资源附件(0)

访问统计