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质子低场核磁共振技术表征建筑石膏水化进程 |
王德强1,2,孙振平1,2,3,杨海静1,2,3,冀言亮1,2,SETZER?M?J4
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1.同济大学 先进土木工程材料教育部重点实验室, 上海 201804;2.同济大学 材料科学与工程学院,上海 201804;3.上海市水务局城市管网智能评估与修复工程技术研究中心, 上海 201900;4.杜伊斯堡-埃森大学 建筑物理与材料科学研究所,北莱茵威斯特法伦 埃森 45121
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摘要: |
基于溶解-析晶理论,根据X射线衍射和热重分析结果,将建筑石膏的水化进程划为4个水化阶段,并利用质子低场核磁共振技术研究了不同水膏比mW/mG和聚羧酸系减水剂(PCE)掺量下,新拌浆体横向弛豫时间T2分布、T2加权平均值T2¯![]() 与主峰峰面积Smain随水化时间的变化规律.结果表明:T2¯![]() 和Smain的变化趋势与水化阶段均具有良好的相关性;增大mW/mG可以使建筑石膏水化阶段出现的时间提前,而掺加PCE则对建筑石膏有明显的缓凝作用. |
关键词: 质子低场核磁共振技术 横向弛豫时间 建筑石膏 水化进程 聚羧酸系减水剂 |
DOI:10.3969/j.issn.1007-9629.2023.08.008 |
分类号:TQ177.377;O657.2 |
基金项目:国家自然科学基金资助项目(52278272, 52108240);上海市科委资助项目(19DZ1202702,19DZ1201404);上海市建委专项课题(住建管2021-001-002);重庆市科技局专项项目(cstc2020kqjscx-phxm1594);内蒙古自治区科技计划项目(2022YFDZ0063); 上海市科委外国专家项目(22WZ2502400);云南省科技厅专家工作站项目(202105AF150243) |
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Characterization of Building Gypsum Hydration Process by 1H Low-Field NMR |
WANG Deqiang1,2, SUN Zhenping1,2,3, YANG Haijing1,2,3, JI Yanliang1,2, SETZER M J4
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;2.School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;3.Research Center of Intelligent Evaluation and Restoration Engineering Technology of Urban Pipe Network of Shanghai Water Bureau, Shanghai 201900, China;4.Institute of Building Physics and Materials Science, University of Duisburg-Essen, Essen 45121, Germany
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Abstract: |
Based on the dissolution-nucleation-growth mechanism, according to the results of X-ray diffraction and thermogravimetric analysis, the full hydration process of building gypsum can be divided into four hydration stages. The distribution of transverse relaxation time (T2), values of intensity-weighted T2(T2¯![]() )and the main peak area (Smain) of plaster with different water-to-gypsum ratios (mW/mG) and different dosages of polycarboxylate superplasticizer (PCE) were studied by 1H low-field NMR. The results show that the changing trend of of T2¯![]() and Smain have a significant correlation with four hydration stages. Increasing mW/mG can accelerate the hydration process. PCE has obvious retardation effect on building gypsum. |
Key words: 1H low-field NMR transverse relaxation time building gypsum hydration process polycarboxylate superplasticizer |