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材料导报  2025, Vol. 39 Issue (3): 23070160-7    https://doi.org/10.11896/cldb.23070160
  无机非金属及其复合材料 |
高温后混凝土毛细吸水特性的核磁共振分析及其力学性能研究
田威1,*, 郭健1, 王文奎1, 张景生1,2, 王凯星1
1 长安大学建筑工程学院,西安 710061
2 中交第四公路工程局有限公司,北京 100022
NMR Analysis of Capillary Water Absorption Characteristics and Mechanical Properties of Concrete After High-temperature
TIAN Wei1,*, GUO Jian1, WANG Wenkui1, ZHANG Jingsheng1,2, WANG Kaixing1
1 School of Architecture and Engineering, Chang'an University, Xi'an 710061, China
2 CCCC Fourth Highway Engineering Bureau Co., Ltd., Beijing 100022, China
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摘要 为了探究高温对混凝土力学性能及毛细吸水特性的影响,对高温后混凝土试样开展单轴压缩试验和毛细吸水试验,并借助核磁共振扫描(NMR)技术对孔隙结构以及毛细吸水过程进行了研究。试验结果表明,经历200、400、600及800 ℃高温作用后,混凝土的质量损失率逐渐增大,抗压强度整体呈先上升后下降的趋势。依据核磁共振T2谱的分布特征将混凝土孔隙分为微孔、中孔、毛细管孔和大孔,分析高温后混凝土吸水特性,发现混凝土吸水高度与核磁信号强度总体上呈指数函数关系;当核磁信号强度迅速增加时,水分在毛细管力的作用下,进入混凝土试样内部;当核磁信号随时间延长仍逐渐上升但增长速率逐渐降低时,试样保持吸水状态但单位时间吸水量逐渐降低;当核磁信号下降且降低速率逐渐减缓时,孔隙逐渐被水分充满,混凝土试样趋于饱和。
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田威
郭健
王文奎
张景生
王凯星
关键词:  混凝土  高温  核磁共振  孔隙结构  毛细吸水    
Abstract: To investigate the influence of high temperature on the mechanical properties and capillary water absorption characteristics of concrete, uniaxial compression tests and capillary water absorption tests were conducted on concrete specimens after exposure to high temperatures of 200, 400, 600, and 800 ℃. The pore structure and capillary water absorption process were studied using Nuclear Magnetic Resonance (NMR) technology. Experimental results indicate that the mass loss rate of concrete gradually increases with exposure to temperatures of 200, 400, 600, and 800 ℃, while the compressive strength increases first and then decreases. Based on the distribution characteristics of the NMR T2 spectrum, concrete pores were classified into micropores, mesopores, capillary pores, and macropores. Analysis of the water absorption characteristics of concrete after exposure to high temperatures reveals that the water absorption height of concrete is generally exponentially related to the NMR signal intensity. When the NMR signal intensity rapidly increases, moisture enters the interior of the concrete specimen under capillary force. As the NMR signal continues to rise gradually over time but at a decreasing rate, the specimen maintains its water absorption state but with a gradually decreasing water absorption rate per unit time. When the NMR signal decreases and the rate of decrease slows down, the pores gradually are filled with moisture, and the concrete specimen tends to be saturation.
Key words:  concrete    high temperature    nuclear magnetic resonance    pore structure    capillary water absorption
出版日期:  2025-02-10      发布日期:  2025-02-05
ZTFLH:  TU528  
基金资助: 国家自然科学基金(51579013);陕西省重点研发计划项目(2024SF-YBXM-615);陕西高校青年创新团队([2022]943)
通讯作者:  *田威,博士,现任长安大学教授、博士研究生导师。主要从事复杂环境下混凝土细微观破损机理,工业固废资源化处理与二氧化碳捕集利用的研究工作。tianwei@chd.edu.cn   
引用本文:    
田威, 郭健, 王文奎, 张景生, 王凯星. 高温后混凝土毛细吸水特性的核磁共振分析及其力学性能研究[J]. 材料导报, 2025, 39(3): 23070160-7.
TIAN Wei, GUO Jian, WANG Wenkui, ZHANG Jingsheng, WANG Kaixing. NMR Analysis of Capillary Water Absorption Characteristics and Mechanical Properties of Concrete After High-temperature. Materials Reports, 2025, 39(3): 23070160-7.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.23070160  或          http://www.mater-rep.com/CN/Y2025/V39/I3/23070160
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