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Shi-kun Chen


Cheng-lin Wu


Dong-ming Yan


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Journal of Zhejiang University SCIENCE A

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Relation between drying shrinkage behavior and the microstructure of metakaolin-based geopolymer

Author(s):  Shi-kun Chen, Cheng-lin Wu, Dong-ming Yan, Yu Ao, Sheng-qian Ruan, Wen-bin Zheng, Xing-liang Sun, Hao Lin

Affiliation(s):  Institute of Engineering Materials, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):  wuch@mst.edu, dmyan@zju.edu.cn

Key Words:  Geopolymer; Drying shrinkage; Microstructure; Modeling

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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, 2021, 22(5): 819-834.

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author="Shi-kun Chen, Cheng-lin Wu, Dong-ming Yan, Yu Ao, Sheng-qian Ruan, Wen-bin Zheng, Xing-liang Sun, Hao Lin",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Relation between drying shrinkage behavior and the microstructure of metakaolin-based geopolymer
%A Shi-kun Chen
%A Cheng-lin Wu
%A Dong-ming Yan
%A Yu Ao
%A Sheng-qian Ruan
%A Wen-bin Zheng
%A Xing-liang Sun
%A Hao Lin
%J Journal of Zhejiang University SCIENCE A
%V 22
%N 10
%P 819-834
%@ 1673-565X
%D 2021
%I Zhejiang University Press & Springer

T1 - Relation between drying shrinkage behavior and the microstructure of metakaolin-based geopolymer
A1 - Shi-kun Chen
A1 - Cheng-lin Wu
A1 - Dong-ming Yan
A1 - Yu Ao
A1 - Sheng-qian Ruan
A1 - Wen-bin Zheng
A1 - Xing-liang Sun
A1 - Hao Lin
J0 - Journal of Zhejiang University Science A
VL - 22
IS - 10
SP - 819
EP - 834
%@ 1673-565X
Y1 - 2021
PB - Zhejiang University Press & Springer
ER -

The drying shrinkage of geopolymers poses significant limitations on their potential as constructive materials. In this study, the drying shrinkage of metakaolin-based geopolymer (MKG) with different initial water/solid ratios and pore structures was investigated experimentally. According to mini-bar shrinkage experiments, the drying shrinkage-water loss relation of MKG showed two-stage behavior. The initial water/solid ratio influences the critical water loss and span of the pausing period of the shrinkage curves but not the general trend. Combined with the microstructure characterization and physical estimation, the underlying dependency of the shrinkage on the pore structure of the binder was elucidated. Capillary pressure, surface energy change, and gel densification dominate the drying shrinkage of MKG at different water loss stages. The findings indicate that besides porosity control, finer tuning of the pore size distribution is needed to control the drying shrinkage of MKG.


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.


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