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材料导报  2026, Vol. 40 Issue (9): 25030246-8    https://doi.org/10.11896/cldb.25030246
  无机非金属及其复合材料 |
基于核磁共振技术及熵理论探究水泥砂浆早期水化特征
季璇1,✝, 付梁2,3,✝, 宁麟4, 毕靖4,*
1 金陵科技学院建筑工程学院,南京 210000
2 四川蜀道铁路投资集团有限责任公司,成都 610299
3 四川隆叙宜铁路有限公司(项目公司),四川 泸州 646001
4 贵州大学土木工程学院,贵阳 550025
Investigation on the Early Hydration Characteristics of Cement Mortar ThroughEntropy Theory and NMR Technology
JI Xuan1,✝, FU Liang2,3,✝, NING Lin4, BI Jing4,*
1 School of Architectural Engineering, Jingling Institute of Technology, Nanjing 210000, China
2 Sichuan Shudao Railway Investment Group Co., Ltd., Chengdu 610299, China
3 Sichuan Longxuyi Railway Co., Ltd., Luzhou 646001, Sichuan, China
4 College of Civil Engineering, Guizhou University, Guiyang 550025, China
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摘要 采用低场核磁共振设备测试不同骨料粒径水泥砂浆在不同水化时刻的T2谱,探究了水化过程中孔径及孔隙水分布特征,采用T2获得试样水化程度及水化速率,并基于香农熵理论深入分析水化过程中孔隙水分布熵(PDE)与水化程度、水化速率的内在联系。研究结果表明:T2谱在4～10 h之间变化最明显,层间孔和胶凝孔(IG)中的物理结合水在4 h前随水化时间延长而减小,4 h后因从毛细孔(C)中大量输入而显著增加。随着水化时间延长,PDE先微增后快速减小,然后再次快速增大并趋于稳定的倒“S”型变化趋势,试样内部孔隙水分布经历混乱-有序-混乱-稳定的发展过程。IG和C对应孔径分布熵变化存在4 h和10 h两个分界点,前4 h内IG孔隙熵减小而C的增大,4 h后IG的快速增大而C的减小。另外,可将PDE减小到与初始时刻相接近或者最小值前1.5～2 h时刻认定为快速水化阶段起点,PDE值变化由快到慢的分界点认定为水化减速阶段起点。研究结论不仅有助于深入理解水泥砂浆的水化机理,还可为新型高性能水泥基材料的研发提供理论支持和技术指导。
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季璇
付梁
宁麟
毕靖
关键词:  孔隙水分布熵  NMR  水化  水泥砂浆    
Abstract: The early hydration process and pore water distribution characteristics of cement mortar were investigated by using Nuclear Magnetic Resonance (NMR) and entropy theory. T2 spectrum, obtained by NMR, was used to explain the hydration degree and rate of the cement mortar, and based on Shannon entropy, the intrinsic relationship between the pore water distribution entropy(PDE) and the hydration degree and rate was deeply analyzed. The results show that significant changes in T2 occur between 4 h and 10 h. The amount of interlayer and gel pore water (IGW) decreases before 4.0 h due to limited input from capillary water (CW), while increases significantly due to substantial contributions from CW. With the extension of hydration time, the pore size distribution entropy (PDE) exhibits an inverted S-shaped pattern characterized by a slight initial increase followed by a rapid decrease, then follows by another rapid increase before stabilizing. The pore water distribution undergoes a chaotic-order-chaotic-stable development process. There are two boundary points for PDE changes corresponding to IG and C, namely 4 h and 10 h. Within the first 4 h, IGW entropy decreases while CW entropy increases, and then IGW entropy increases rapidly while CW entropy decreases correspondingly. Additionally, the moment when the PDE is reduced to be close to the initial value or 1.5 to 2 hours before the minimum value can be identified as the initiation of the acceleration hydration stage. Similarly, a dividing point for the deceleration stage can be determined where the PDE value changes from fast to slow. This work may offer theoretical underpinnings and technical guidance for the exploration of novel high-performance cementitious materials.
Key words:  pore water distribution entropy (PDE)    nuclear magnetic resonance (NMR)    hydration characteristics    cement mortar
收稿日期:  2026-05-10      出版日期:  2026-05-10      发布日期:  2026-05-18
ZTFLH:  TU528.0  
基金资助: 国家自然科学基金(52164001)
通讯作者:  *毕靖,博士,贵州大学土木工程学院副教授、研究生导师。目前主要从事岩石力学方面的研究。demonjjun@126.com   
作者简介:  †共同第一作者
季璇,硕士,金陵科技学院建筑工程学院教师。目前主要研究领域为地下混凝土结构、混凝土设计。
付梁,博士,四川蜀道铁路投资集团有限责任公司工程师。目前主要研究领域为数值模拟、岩土工程、断裂力学。
引用本文:    
季璇, 付梁, 宁麟, 毕靖. 基于核磁共振技术及熵理论探究水泥砂浆早期水化特征[J]. 材料导报, 2026, 40(9): 25030246-8.
JI Xuan, FU Liang, NING Lin, BI Jing. Investigation on the Early Hydration Characteristics of Cement Mortar ThroughEntropy Theory and NMR Technology. Materials Reports, 2026, 40(9): 25030246-8.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.25030246  或          https://www.mater-rep.com/CN/Y2026/V40/I9/25030246
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