[1]金立兵,王振豪,武 甜,等.受压混凝土中硫酸根离子的扩散与损伤机理分析[J].郑州大学学报(工学版),2024,45(02):121-128.[doi:10.13705/j.issn.1671-6833.2024.02.012]
　JIN Libing,WANG Zhenhao,WU Tian,et al.Analysis of Sulfate Ion Diffusion and Damage Mechanism in Compressed Concrete[J].Journal of Zhengzhou University (Engineering Science),2024,45(02):121-128.[doi:10.13705/j.issn.1671-6833.2024.02.012]
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受压混凝土中硫酸根离子的扩散与损伤机理分析()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
45
期数:
2024年02期
页码:
121-128
栏目:
出版日期:
2024-03-06

文章信息/Info

Title:
Analysis of Sulfate Ion Diffusion and Damage Mechanism in Compressed Concrete
作者:
金立兵;  王振豪;  武 甜;  谢志恒;  周 品
河南工业大学 土木工程学院,河南 郑州 450001
Author(s):
JIN Libing;  WANG Zhenhao;  WU Tian;  XIE Zhiheng;  ZHOU Pin
School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China
关键词:
混凝土;  硫酸盐侵蚀;  应力水平;  离子扩散模型;  细观模型;  数值模拟
Keywords:
concrete;  sulfate attack;  stress level;  ion diffusion model;  mesoscopic model;  numerical simulation
分类号:
TU528
DOI:
10.13705/j.issn.1671-6833.2024.02.012
文献标志码:
A
摘要:
针对沿海、盐渍土环境下荷载和硫酸盐侵蚀的耦合作用对混凝土结构耐久性造成的损伤,提出了一种受 压混凝土中硫酸根离子扩散的数值模型。 首先,基于 Fick 第二定律,考虑应力和混凝土孔隙率之间的关系建立了 荷载作用下混凝土内硫酸根离子的理论扩散模型;其次,通过自编程序构建包含水泥砂浆、界面过渡区和天然骨料 的混凝土三相随机凸多边形骨料模型,从而实现了受压混凝土中硫酸根离子扩散的细观模拟;最后,通过与受压混 凝土在硫酸盐溶液中全浸泡的实验结果对比分析,验证了理论模型和细观模型的有效性。 进而对不同水灰比的受 压混凝土试件在不同浓度硫酸盐溶液中的离子扩散与损伤过程进行了数值分析,分析结果表明:随着压应力水平 的提高,同深度处硫酸根离子浓度逐渐减小;与压应力相比,侵蚀溶液浓度和水灰比对硫酸根离子扩散的影响更加 明显;水灰比对压应力抑制离子扩散程度的影响要大于侵蚀溶液浓度;适当减小水灰比更有利于受压状态下的混 凝土抵抗硫酸盐侵蚀。
Abstract:
In view of the damage to the durability of concrete structures caused by the coupled effects of loading and sulfate attack in coastal and saline soil environments, a numerical model for the sulfate ion diffusion in compressed concrete was proposed. Firstly, based on Fick′s second law, a theoretical diffusion model of sulfate ions in concrete under loading was established by considering the relationship between stress and concrete porosity. Secondly, a three-phase mesoscopic convex polygonal stochastic aggregate model of concrete containing cement mortar, interfacial transition zone, and natural aggregate was established by a self-programmed program, which enabled the mesoscopic simulation of sulfate ions diffusion in compressed concrete. Finally, the validity of the theoretical and mesoscopic models was verified by comparative analysis with the experiment results of full immersion of compressed concrete in a sulfate solution. Then the ion diffusion and damage process of compressed concrete specimens with different water-cement ratios in sulfate solutions of different concentrations were numerically analyzed. The findings indicate that the sulfate ion concentration at the same depth gradually decreased as the compressive stress level increased. The effects of sulfate concentration and the water-cement ratio on sulfate ion diffusion were more evident than with compressive stress. The extent to which compressive stress inhibited ion diffusion was influenced more by the water-cement ratio than by the sulfate concentration. Reducing the water-to-cement ratio appropriately made the compressed concrete more resistant to the sulfate attack.

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更新日期/Last Update: 2024-03-08