[1]田 威,王 震,韩 女.硫酸盐侵蚀作用下混凝土细观破损机理研究[J].防灾减灾工程学报,2019,39(01):16-22+60.[doi:10.13409/j.cnki.jdpme.2019.01.003]
 TIAN Wei,WANG Zhen,HAN Nyu.Study of Meso-damage Mechanism of Concrete under Sulfate Attack[J].Journal of Disaster Prevention and Mitigation Engineering,2019,39(01):16-22+60.[doi:10.13409/j.cnki.jdpme.2019.01.003]
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硫酸盐侵蚀作用下混凝土细观破损机理研究()
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防灾减灾工程学报[ISSN:1672-2132/CN:32-1695/P]

卷:
39卷
期数:
2019年01期
页码:
16-22+60
栏目:
论文
出版日期:
2019-02-28

文章信息/Info

Title:
Study of Meso-damage Mechanism of Concrete under Sulfate Attack
文章编号:
1672-2132(2019)01-0016-07
作者:
田 威 王 震 韩 女
长安大学建筑工程学院,陕西 西安 710061
Author(s):
TIAN Wei WANG Zhen HAN Nyu
School of Architectural Engineering, Chang'an University, Xi'an 710061,China
关键词:
混凝土 硫酸盐侵蚀 干湿循环 CT扫描 孔隙结构
Keywords:
concrete sulfate attack drying-wetting cycles CT scan pore structure
分类号:
TU501
DOI:
10.13409/j.cnki.jdpme.2019.01.003
文献标志码:
A
摘要:
侵蚀环境下混凝土材料的内部孔隙空间分布特征与演化规律是材料破损机理及宏观力学性能研究的关键问题。采用X射线断层扫描技术(CT)对硫酸盐侵蚀与干湿循环耦合作用下混凝土的细观损伤过程进行实时扫描,在此基础上,结合图像处理与三维重构技术开展了混凝土内部孔隙结构的空间分布特征与演化规律研究,并通过提出的孔隙分区的方法深入研究了材料细观破损特征和机理。结果表明:宏观上试样质量、抗压强度均呈现规律性变化,溶液中钙镁离子浓度有明显的累积性趋势; 细观上试样孔隙率随侵蚀时间的增加呈先减小后增大的变化,单轴抗压强度与孔隙率大体上呈负相关关系。同时,混凝土试样不同分区内孔隙率演化规律各不相同,但总体呈现先减小后增大的趋势,侵蚀作用深度随侵蚀时间不断增长。结论可为深入研究硫酸盐侵蚀下混凝土材料细观破损机理提供依据。
Abstract:
The evolution and spatial distribution of internal random meso-porous structure are key problems in studying damage mechanism and macro-mechanical properties of concrete material under sulfate attack.X-ray tomography(CT)were used to scan the meso-damage process of concrete under sulfate attack.Based on this, combined with image processing and 3D reconstruction technology, the spatial distribution characteristics and evolution laws of pore in concrete was investigated using the proposed method of pore partitioning.The experimental results show that the concentration of Ca2+ and Mg2+ in the solution increased slowly.The compressive strength of concrete is closely related to its meso-pore structure under the coupling of sulfate attack and drying-wetting cycles.The evolution laws of pore in different regions of concrete specimen are different under the coupled effect of sulfate attack and drying-wetting cycles.Generally, the porosity increased after a slight decrease, and the corrosion depth increases with the corrosion time.There was a negative correlation between the uniaxial compressive strength and porosity.This study laid foundation for further research on meso-damage mechanism of concrete under sulfate attack.

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备注/Memo

备注/Memo:
收稿日期:2017-11-11; 修回日期:2018-03-25 基金项目:国家自然科学基金面上项目(51579013)、西安市建设科技计划项目(SJW2017-13)、长安大学研究生科研创新实践项目(201809)资助 作者简介:田威(1981-),男,教授,博士。主要从事岩土工程数值仿真、岩土材料细观力学分析方面的研究。Email:tianwei@chd.edu.cn
更新日期/Last Update: 2019-02-20