[1] Wu Hairong, Lü Qingfang, Jin Weiliang, et al. Durability related environmental zonationand design methodology for marine RC structures [J]. Journal of Southeast University (English Edition), 2018, 34 (1): 78-86. [doi:10.3969/j.issn.1003-7985.2018.01.012]
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Durability related environmental zonationand design methodology for marine RC structures(
)
海洋钢筋混凝土结构耐久性环境区划与设计方法
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 34
- Issue:
- 2018 1
- Page:
- 78-86
- Research Field:
- Materials Sciences and Engineering
- Publishing date:
- 2018-03-20
Info
- Title:
- Durability related environmental zonationand design methodology for marine RC structures
- 海洋钢筋混凝土结构耐久性环境区划与设计方法
- Author(s):
- Wu Hairong1; 2; Lü Qingfang3; Jin Weiliang1
-
1Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
3School of Civil Engineering, Southeast University, Nanjing 210096, China
- Keywords:
- reinforced concrete structure; marine; chloride ion; environment; zonation; durability design
- PACS:
- TU528.01
- DOI:
- 10.3969/j.issn.1003-7985.2018.01.012
- Abstract:
- A reliability-based quantitative durability design methodology is presented for reinforced concrete(RC)structures in the marine environment on the basis of natural exposure data derived from four berths(1.5, 1.5, 4 and 15 years)of a concrete port. More than 200 chloride profiles are obtained and analyzed. The relationship between nominal surface chloride ion concentration and altitude is discussed. Subsequently, the formula of the apparent chloride diffusion coefficient is proposed with consideration of the surrounding temperature, sodium chloride solution concentration, age factor and altitude. Then, the reliability-based method to predict the durability of RC structures is developed according to Fick’s second law. Relationships between the predicted penetration depth of the chloride ion, the ratio of the wetting time per-period and the corresponding altitude are discussed. Subsequently, the environmental zonation methodology is established for concrete structures under a marine chloride environment by considering the ratio of the wetting time per-period of concrete as the zoning index. Finally, the corres-ponding durability design method for each zone level is established, which contains the durability design regulations of the specimen, and correction coefficients for different water/binder ratios, ages, temperatures and chloride ion concentrations.
- 针对海洋环境中的钢筋混凝土结构, 基于某混凝土港口4个泊位的自然暴露检测数据(暴露时间分别为1.5, 1.5, 4, 15年), 提出了一个基于可靠性的混凝土结构耐久性定量化设计方法.基于检测得到的200多条混凝土中氯离子含量随侵蚀深度的分布曲线, 对表面氯离子浓度与高程的关系进行了讨论, 进一步提出了考虑环境温度、氯离子浓度、龄期系数和高程等因素的表观氯离子扩散系数的计算公式.然后, 依据Fick第二定律, 建立了基于可靠度的钢筋混凝土结构耐久性概率预测方法.讨论了混凝土氯离子侵蚀深度预测值、浸润时间比和高程的关系, 建立了以海水浸润时间比为指标的海洋环境区划体系.最后, 建立针对环境区划体系的分区设计方法, 包括了标准试件的分区设计规定和不同水胶比、设计年限、温度、氯离子含量修正系数的分区设计规定体系.
References:
[1] Ahmad S. Reinforcement corrosion in concrete structures, its monitoring and service life prediction—A review[J]. Cement and Concrete Composites, 2003, 25(4/5): 459-471. DOI:10.1016/s0958-9465(02)00086-0.
[2] Conciatori D, Grégoire É, Samson É, et al. Sensitivity of chloride ingress modelling in concrete to input parameter variability[J]. Materials and Structures, 2015, 48(9):3023-3036.
[3] Angst U M, Polder R. Spatial variability of chloride in concrete within homogeneously exposed areas[J]. Cement and Concrete Research, 2014, 56: 40-51. DOI:10.1016/j.cemconres.2013.10.010.
[4] Ministry of Housing and Urban-Rural Development of the People’s Republic of China. GB/T 50476—2008 Code for durability design of concrete structures[S]. Beijing: China Building Industry Press, 2008.(in Chinese)
[5] Crete D. General guidelines for durability design and redesign [R]. Brussels: The European Union-Brite EuRam Ⅲ, 2000.
[6] Jin W L, Lü Q F. Study on durability zonation standard of concrete structural design[C]//Proceedings of Durability of Reinforced Concrete on the Combined Mechanical Climatic Loads. Qingdao, China, 2005: 35-42.
[7] Jin W L, Lü Q F. Durability zonation standard of concrete structure design[J]. Journal of Southeast University(English Edition), 2007, 23(1): 98-104.
[8] Jin W L, Yuan Y S, Wei J. Theories and design for durability of concrete structures exposed to chloride environment [M]. Beijing: Science Press, 2011.(in Chinese)
[9] Wu H R, Jin W L, Lv Q F, et al. Reliability-based zonation of environmental area according to its effect on durability of concrete structures[J]. Journal of Zhejiang University(Engineering Science), 2012, 46(3):416-423.(in Chinese)
[10] Wu H R, Jin W L, Yan Y D, et al. Environmental zonation and life prediction of concrete in frost environments[J]. Journal of Zhejiang University(Engineering Science), 2012, 46(4):650-657.(in Chinese)
[11] Lay S, Schissel P, Cairns J. Probabilistic service life models for reinforced concrete structures[D]. Munich, Germany: School of Architectural Technology, Technical University of Munich, 2003.
[12] Luo D M, Wang Y, Niu D T. Durability environmental regionalization for concrete structures[J]. Mathematical Problems in Engineering, 2013, 2013:1-11. DOI:10.1155/2013/482641.
[13] Huang Q H, Xu N, Gu X L. Environmental zonation for durability assessment and design of reinforced concrete structures in China[C]//Proceedings of the First International Conference on Microstructure Related Durability of Cementitious Composites. Nanjing, China, 2008: 735-743.
[14] Otieno M, Beushausen H, Alexander M. Chloride-induced corrosion of steel in cracked concrete—Part Ⅱ: Corrosion rate prediction models[J]. Cement and Concrete Research, 2016, 79: 386-394. DOI:10.1016/j.cemconres.2015.08.008.
[15] Ministry of Transport of the People’s Republic of China. JTJ 275—2000 Corrosion prevention technical specifications for concrete structures of marine harbour engineering[S]. Beijing: China Communications Press, 2001.(in Chinese)
[16] Mangat P S, Molloy B T. Prediction of long term chloride concentration in concrete[J]. Materials and Structures, 1994, 27(6): 338-346. DOI:10.1007/bf02473426.
[17] Kassir M K, Ghosn M. Chloride-induced corrosion of reinforced concrete bridge decks[J]. Cement and Concrete Research, 2002, 32(1):139-143.
[18] ASTM International. ASTM C 1218/C 1218M—99 Standard test method for water-soluble chloride in mortar and concrete[S]. West Conshohocken, PA, USA: ASTM International, 2008.
[19] Crank J. The mathematic of diffusion[M]. 2nd ed. Oxford: Clarendon Press, 1979: 1-18.
[20] American Concrete Institute. ACI 318—05 Building code requirements for structural concrete and Commentary(ACI 318R-05)[S]. Farmington Hills, USA: American Concrete Institute, 2005.
[21] CEBFIP. The fib model code for concrete structures 2010[S]. Lausanne, Switzerland:Comité Euro-International du Béton(CEB)-Fédération Internationale de la Précontrainte(FIP), 2010.
[22] Wang C K. Standardization study on test of chloride ion penetration and carbonation of concrete[D]. Hangzhou: School of Architectural Engineering, Zhejiang University, 2010.(in Chinese)
[23] Bentz E C, Thomas M D A. Life-365 user manual: Computer program for predicting the service life and life-cycle cost of reinforced concrete exposed to chlorides[R]. Washington, DC, USA: The Silica Fume Association, 2013.
[24] Xu X W. Standardizing study on concrete freeze-thaw tests under different environments[D]. Hangzhou: School of Architectural Engineering, Zhejiang University, 2010.(in Chinese)
[25] NordTest. NT BUILD 443 Accelerated chloride penetration into hardened concrete[S]. Nordtest, Espoo, Finland: NordTest, 1995.
[26] Zhao S C. The impact of non-bearing elements on reliability of flexural component under chloride environment[J]. Highway, 2003, 9:12-17.(in Chinese)
[27] Jin L B. Multi-environmental time similarity(METS)theory and its application in coastal concrete structural durability[D]. Hangzhou: School of Architectural Engineering, Zhejiang University, 2010.(in Chinese)
[28] Wu J, Cheng J X. Durability assessment of reinforced concrete structures under marine environment[J]. Journal of Hydroelectric Engineering, 2005, 24(1):69-73.(in Chinese)
[29] Söderqvist M K, Vesikari E. Generic technical handbook for a predictive life cycle management system of concrete structures(LMS)[R]. Finland: The Finnish Road Administration, 2003.
[30] Chen Z Y. Durability design of concrete structures[J]. Architecture Technology, 2003, 34(5): 328-333.(in Chinese)
[31] Glass G K, Buenfeld N R. The presentation of the chloride threshold level for corrosion of steel in concrete[J].Corrosion Science, 1997(5): 1001-1013. DOI:10.1016/s0010-938x(97)00009-7.
[32] Alonso C, Andrade C, Castellote M, et al. Chloride threshold values to depassivate reinforcing bars embedded in a standardized OPC mortar[J]. Cement and Concrete Research, 2000, 30(7): 1047-1055. DOI:10.1016/s0008-8846(00)00265-9.
[33] Yao C J. Penetration laws of chloride ions in concrete infrastructures at coastal ports[D]. Hangzhou: School of Architectural Engineering, Zhejiang University, 2007.(in Chinese)
Memo
- Memo:
-
Biography: Wu Hairong(1983—), female, doctor, lecturer, zjuwhr@hncj.edu.cn.
Foundation item: The National Natural Science Foundation of China(No. 51508162).
Citation: Wu Hairong, Lü Qingfang, Jin Weiliang.Durability related environmental zonation and design methodology for marine RC structures[J].Journal of Southeast University(English Edition), 2018, 34(1):78-86.DOI:10.3969/j.issn.1003-7985.2018.01.012.