CLC number: TU526
On-line Access: 2021-10-18
Received: 2020-11-03
Revision Accepted: 2021-02-14
Crosschecked: 2021-09-23
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Citations: Bibtex RefMan EndNote GB/T7714
https://orcid.org/0000-0002-3160-4101
Shi-kun Chen, Cheng-lin Wu, Dong-ming Yan, Yu Ao, Sheng-qian Ruan, Wen-bin Zheng, Xing-liang Sun, Hao Lin. Relation between drying shrinkage behavior and the microstructure of metakaolin-based geopolymer[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2000513 @article{title="Relation between drying shrinkage behavior and the microstructure of metakaolin-based geopolymer", %0 Journal Article TY - JOUR
偏高岭土基地聚物干燥收缩与微观结构关系创新点:1. 通过干燥收缩试验,揭示了地聚物失水-收缩的两阶段关系以及初始水固比对地聚物失水-收缩行为的影响规律;2. 基于地聚物孔隙特征建立了地聚物失水-收缩的多尺度物理模型,并成功地模拟了失水-收缩试验结果,进一步揭示了孔隙结构在地聚物失水-收缩过程中的作用机制. 方法:1. 通过干燥收缩实验分析,得到地聚物在低湿度环境下的干燥失水与体积收缩规律(图5和6);2. 通过微观表征分析,揭示地聚物多尺度孔隙结构特征,以及初始水固比对微结构的影响规律(图7~10);3. 通过多尺度物理模型分析,建立基于微结构的地聚物干燥收缩数学关系,揭示孔隙结构控制干燥收缩行为的微观机制(图11和13,公式(12)、(19)、(23)和(24)). 结论:1. 偏高岭土基地聚物具有两阶段失水-收缩行为,初始水固比改变地聚物孔结构从而对失水-收缩行为产生影响;2. 早期失水过程(阶段I)中,地聚物微孔失水是干燥收缩的主要成因,这一阶段控制因素由毛细应力向表面能改变逐步转变,微孔孔隙率与特征尺寸控制这一过程的干燥收缩;3. 后期失水过程(阶段II)中,地聚物纳米孔失水与凝胶致密化是干燥收缩的主要成因,这一阶段地聚物体积剧烈收缩(最高达到阶段I的7~10倍),因此控制失水量不超过阶段I和II之间的临界值是避免地聚物严重干燥收缩的基本方法,且改变地聚物的初始水固比与微孔结构对临界失水量也会产生影响. 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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