[1] Jin Zuquan, Sun Wei, Jiang Jinyang, et al. Damage of concrete attacked by sulfate and sustained loading [J]. Journal of Southeast University (English Edition), 2008, 24 (1): 69-73. [doi:10.3969/j.issn.1003-7985.2008.01.016]

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Damage of concrete attacked by sulfate and sustained loading()

持续荷载下混凝土的硫酸盐腐蚀研究

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

Volumn:

24

Issue:

2008 1

Page:

69-73

Research Field:

Materials Sciences and Engineering

Publishing date:

2008-03-30

Info

Title:

Damage of concrete attacked by sulfate and sustained loading

持续荷载下混凝土的硫酸盐腐蚀研究

Author(s):

Jin Zuquan^{1, 2}, Sun Wei¹, Jiang Jinyang¹, Zhao Tiejun²

¹School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
²School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China

金祖权^{1, 2}, 孙伟¹, 蒋金洋¹, 赵铁军²

¹东南大学材料科学与工程学院, 南京 211189; ²青岛理工大学土木工程学院, 青岛 266033

Keywords:

concrete;  sulfate;  flexural load;  microstructure

混凝土;  硫酸盐;  弯曲荷载;  微观结构

PACS:

TU528.01

DOI:

10.3969/j.issn.1003-7985.2008.01.016

Abstract:

The damage processes of ordinary concrete and high strength concrete, attacked by solutions of 2.5%, 5.0% and 10%Na₂SO₄(mass fraction)are studied.And the effects of flexural loads with stress ratios of 25% and 50% of the initial flexural strength on the damage process of concrete are also investigated.The results show that the damage process of concrete attacked by sulfate salt exhibits an initial damaged stage, a performance improving stage and a performance worsening stage.When the concentration of Na₂SO₄ in a solution increases from 2.5% to 5.0%, the service time of the concrete decreases approximately 25%.Furthermore, it decreases to even 40% with an increase in a Na₂SO₄ concentration up to 10%.And the flexural load accelerates the deterioration rate of the concrete in the latter period.The stress ratio increases from 0 to 25%, the failure time of the concrete decreases 15%;and the failure time decreases between 25% and 35% when the stress ratio increases from 25% to 50%.In addition, sulfate corrosion products of concrete are studied by SEM(scanning electron microscopy), EDS(energy disperse spectroscopy)and XRD(X-ray diffraction).

研究了普通混凝土和高强混凝土在2.5%, 5.0%和10%Na₂SO₄溶液(质量分数), 以及承受不同应力比(0, 25%和50%)弯曲荷载作用下的损伤失效规律、特点.结果表明:混凝土在硫酸盐溶液中腐蚀, 其损伤劣化包括初始劣化段、性能改善段和性能劣化段.腐蚀溶液中Na₂SO₄浓度从2.5%增加到5.0%, 混凝土失效时间缩短了25%左右;Na₂SO₄浓度增加到10%, 失效时间缩短了40%.弯曲荷载在腐蚀后期加速混凝土的损伤劣化速度, 应力比由0增加到25%, 混凝土破坏时间降低15%;应力比增加到50%, 其破坏时间降低25%~35%.此外, 用SEM、能谱和XRD分析了混凝土在硫酸盐腐蚀作用下的腐蚀产物.

References:

[1] Qiao Hongxia, He Zhongmao, Zhu Yanpeng.Durability study of high performance concrete in salt region[J].China Railway Science, 2006, 27(4):32-37.(in Chinese)
[2] Zhang Yujiang, Du Qiang.Application of HPC in pumping station engineering in Bositeng Lake[J].Xiangjiang Water Resources, 2005, 105(3):27-30.(in Chinese)
[3] Mehta P K.Concrete microstructure, properties and materials [M].3rd ed.McGraw-Hill, 2006:160-161.
[4] Dehwah H A F.Effect of sulfate concentration and associated cation type on concrete deterioration and morphological changes in cement hydrates[J].Construction and Building Materials, 2007, 21(1):29-39.
[5] Liang Yongning, Yuan Yingshu.Study on ultrasonic inspection damage of concrete due to sulfate corrosion[J].Concrete, 2004, 178(8):15-17.(in Chinese)
[6] Santhanam Manu, Cohen Menashi D, Olek Jan.Sulfate attack research:whither now?[J].2001, 31(6):845-851.
[7] Leng Faguang, Ma Xiaoxuan, Tian Guanfei.Investigation of test methods of concrete under sulfate corrosion[J].Journal of Southeast University:Natural Science Edition, 2006, 36(SupⅡ):45-48.(in Chinese)
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Memo

Memo:

Biographies: Jin Zuquan(1977—), male, doctor, associate professor, jinzuquan@sohu.com;Sun Wei(1935—), female, professor, the academician of Chinese Academy of Engineering, sunwei@seu.edu.cn.
Foundation items: The National High Technology Research and Development Program of China(863 Program)(No.2003AA33X100), the National Natural Science Foundation of China(No.50708046, 50739001).
Citation: Jin Zuquan, Sun Wei, Jiang Jinyang, et al.Damage of concrete attacked by sulfate and sustained loading[J].Journal of Southeast University(English Edition), 2008, 24(1):69-73.

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