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材料导报  2025, Vol. 39 Issue (19): 24080219-7    https://doi.org/10.11896/cldb.24080219
  无机非金属及其复合材料 |
非饱和水工混凝土冻融劣化微观孔隙结构与宏观性能关系研究
黄耀英1,*, 方晨1, 邵成羽1,2, 李泽鹏1, 朱赵辉3
1 三峡大学水利与环境学院,湖北 宜昌 443002
2 长江水利委员会机关服务中心,武汉 430010
3 中国水利水电科学研究院,北京 100038
Study on the Relationship Between Microscopic Pore Structure and Macroscopic Properties of Unsaturated Hydraulic Concrete Under Freeze-Thaw Deterioration
HUANG Yaoying1,*, FANG Chen1, SHAO Chengyu1,2, LI Zepeng1, ZHU Zhaohui3
1 College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, Hubei, China
2 Agencies Service Center of Changjiang Water Resources Commission, Wuhan 430010, China
3 China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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摘要 本工作研究了非饱和水工混凝土冻融劣化微观孔隙结构与宏观力学性能之间的关系。设计开展了三种不同饱和度(85%~91.7%、91.7%~95%、95%~100%)水工混凝土密封冻融和水冻水融试验,测试获得了经历三种不同冻融循环温度(-18~6 ℃、-10~6 ℃、-5~6 ℃)下水工混凝土抗压和劈拉强度宏观劣化值,同时基于氮吸附法检测了砂浆区域的微观孔隙结构参数,进而回归分析了微观孔隙结构与宏观力学性能之间的关系,最后建立了非饱和水工混凝土冻融劣化预测模型。结果表明,密封冻融和水冻水融宏-微观性能的劣化规律相似,但密封冻融组的劣化程度小于水冻水融组。冻融劣化后的非饱和水工混凝土强度与平均孔径、总孔隙量和总孔隙率负相关,而与分形维数正相关,基于冻融劣化后的混凝土砂浆的分形维数与无害孔体积分数可以较准确预测非饱和水工混凝土的强度性能,模型复相关系数分别达到0.978和0.951。
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黄耀英
方晨
邵成羽
李泽鹏
朱赵辉
关键词:  非饱和水工混凝土  冻融损伤  宏-微观性能  预测模型    
Abstract: In this study, the relationship between microscopic pore structure and macroscopic mechanical properties of unsaturated hydraulic concrete under freeze-thaw deterioration was investigated. The sealed freeze-thaw test with three different saturations (85%~91.7%, 91.7%~95%, 95%~100%) and water-freeze-thaw test of hydraulic concrete were designed and carried out. The macroscopic degradation values of compressive and splitting strength of hydraulic concrete under three different freeze-thaw cycle temperatures (-18~6 ℃, -10~6 ℃, -5~6 ℃ ) were obtained. In addition, the corresponding microscopic pore structure parameters were detected based on the nitrogen adsorption method. Then the relationship between microscopic pore structure and macroscopic mechanical properties was analyzed by regression. Finally, a prediction model of freeze-thaw deterioration of unsaturated hydraulic concrete was established. The results show that the deterioration rule of macro and micro properties of sealed freeze-thaw group is similar to that of water-freeze-thaw group, but the deterioration amplitude of sealed freeze-thaw group is smaller than that of water-freeze-thaw group. The strength of unsaturated hydraulic concrete after freeze-thaw deterioration is negatively correlated with average pore size, total pore volume and total porosity, but positively correlated with fractal dimension. Based on the fractal dimension and harmless pore volume fraction of concrete mortar after freeze-thaw deterioration, the strength performance of unsaturated hydraulic concrete can be accurately predicted, the multiple correlation coefficients of the model were 0.978 and 0.951, respectively.
Key words:  unsaturated hydraulic concrete    freeze-thaw damage    macro-micro performance    prediction model
出版日期:  2025-10-10      发布日期:  2025-09-24
ZTFLH:  TV41  
基金资助: 国家自然科学基金(52179135;52239009)
通讯作者:  *黄耀英,博士,三峡大学水利与环境学院教授、博士研究生导师。目前主要从事水工程安全监控、长效服役试验与数值计算等方面的研究工作。huangyaoying@ctgu.edu.cn   
引用本文:    
黄耀英, 方晨, 邵成羽, 李泽鹏, 朱赵辉. 非饱和水工混凝土冻融劣化微观孔隙结构与宏观性能关系研究[J]. 材料导报, 2025, 39(19): 24080219-7.
HUANG Yaoying, FANG Chen, SHAO Chengyu, LI Zepeng, ZHU Zhaohui. Study on the Relationship Between Microscopic Pore Structure and Macroscopic Properties of Unsaturated Hydraulic Concrete Under Freeze-Thaw Deterioration. Materials Reports, 2025, 39(19): 24080219-7.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.24080219  或          https://www.mater-rep.com/CN/Y2025/V39/I19/24080219
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