[1] Zhang Feng, Li Shuchen, Ye Jianshu, Li Shoukai, et al. Evolution model of concrete failure surfaceunder coupling effect of seawater freeze-thaw and erosion [J]. Journal of Southeast University (English Edition), 2011, 27 (2): 206-209. [doi:10.3969/j.issn.1003-7985.2011.02.019]

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Evolution model of concrete failure surfaceunder coupling effect of seawater freeze-thaw and erosion()

海水冻融和侵蚀耦合作用下混凝土破坏面演化模型

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

27

Issue:

2011 2

Page:

206-209

Research Field:

Traffic and Transportation Engineering

Publishing date:

2011-06-30

Info

Title:

Evolution model of concrete failure surfaceunder coupling effect of seawater freeze-thaw and erosion

海水冻融和侵蚀耦合作用下混凝土破坏面演化模型

Author(s):

Zhang Feng¹;  Li Shuchen¹;  Ye Jianshu²;  Li Shoukai¹

¹Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China
²School of Transportation, Southeast University, Nanjing 210096, China

张峰¹;  李树忱¹;  叶见曙²;  李守凯¹

¹山东大学岩土与结构工程研究中心, 济南 250061; ²东南大学交通学院, 南京 210096

Keywords:

concrete;  freeze-thaw;  wet and dry cycles;  erosion;  Ottosen strength criterion

混凝土;  冻融循环;  干湿循环;  侵蚀;  Ottosen强度准则

PACS:

U311.2

DOI:

10.3969/j.issn.1003-7985.2011.02.019

Abstract:

In order to effectively assess the mechanical properties of concrete with freeze-thaw and seawater erosion, tests about basic mechanical properties of concrete after freeze-thaw and seawater erosion are conducted based on the large-scale static and dynamic stiffness servo test set. 50, 100, 200 and 300 cycles of freeze-thaw cycling are made on normal concrete, and the artificial seawater is produced. The reasonable wet and dry accelerate system is selected. 10, 20, 30, 40, 50 and 60 cycles of wet and dry cycling are made to concrete after freeze-thaw cycling. The degeneration law of the concrete elastic modulus and compressive strength is studied. The Ottosen tri-axial strength criterion considering cycles of freeze-thaw and wet and dry cycling is deduced based on uniaxial mechanical properties of concrete and damage theory. Experimental results show that with the increase in the number of wet and dry cycles and freeze-thaw cycles, the concrete axial compressive strength and the elastic modulus decline gradually. Tensile and compressive meridians of concrete shrink gradually. The research can be referenced for anti-crack design of actual structures eroded by seawater at cold regions.

为了有效评估海水冻融与侵蚀后混凝土的力学性能, 基于大型静态和动态刚度伺服压力机进行了混凝土冻融和海水侵蚀后的力学性能试验.对混凝土进行了50, 100, 200和300 次冻融循环, 并配置了人工海水;选择了合理的干湿循环机制, 对冻融后的混凝土试块进行了10, 20, 30, 40, 50和60次干湿循环.对混凝土弹性模量和抗压强度退化规律进行了研究.基于混凝土单轴力学性能和损伤理论, 推导了考虑干湿循环次数和冻融循环次数的Ottosen三轴强度.试验研究表明:随着干湿循环和冻融循环次数增加, 混凝土轴心抗压强度和弹性模量逐渐下降, 强度准则的拉、压子午线逐渐收缩.该研究可为受海水侵蚀在寒冷地区的实际结构抗裂设计提供参考.

References:

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Memo

Memo:

Biography: Zhang Feng(1978—), male, doctor, associate professor, zhangfeng2008@sdu.edu.cn.
Foundation items: The Natural Science Foundation of Shandong Province(No.ZR2009FQ020), the Ph.D. Programs Foundation of Ministry of Education of China(No.20100131120042).
Citation: Zhang Feng, Li Shuchen, Ye Jianshu, et al. Evolution model of concrete failure surface under coupling effect of seawater freeze-thaw and erosion[J].Journal of Southeast University(English Edition), 2011, 27(2):206-209.[doi:10.3969/j.issn.1003-7985.2011.02.019]

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