Full Text:  <1065>

Summary:  <66>

CLC number: TU526

On-line Access: 2021-10-18

Received: 2020-11-03

Revision Accepted: 2021-02-14

Crosschecked: 2021-09-23

Cited: 0

Clicked: 1587

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Shi-kun Chen

https://orcid.org/0000-0002-3160-4101

Cheng-lin Wu

https://orcid.org/0000-0001-7733-1084

Dong-ming Yan

https://orcid.org/0000-0003-2522-3342

-   Go to

Article info.
Open peer comments

Journal of Zhejiang University SCIENCE A

Accepted manuscript available online (unedited version)


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


Share this article to? More <<< Previous Paper|Next Paper >>>

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.

@article{title="Relation between drying shrinkage behavior and the microstructure of metakaolin-based geopolymer",
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",
volume="22",
number="10",
pages="819-834",
year="2021",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000513"
}

%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

TY - JOUR
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 -


Abstract: 
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.

偏高岭土基地聚物干燥收缩与微观结构关系

目的:显著的干燥收缩是地聚物材料工程应用的重要制约因素之一.本文通过试验与理论分析,探讨偏高岭土基地聚物显著干燥收缩的成因,理清地聚物干燥收缩与微观结构的内在关系,从而提出控制地聚物干燥收缩的基本方法,提高地聚物材料的耐久性.
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:地聚物;干燥收缩;微观结构;物理建模

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]Amran M, Debbarma S, Ozbakkaloglu T, 2021. Fly ash-based eco-friendly geopolymer concrete: a critical review of the long-term durability properties. Construction and Building Materials, 270:121857.

[2]Antunes Boca Santa RA, Soares C, Riella HG, 2017. Geopolymers obtained from bottom ash as source of alumino silicate cured at room temperature. Construction and Building Materials, 157:459-466.

[3]ASTM (American Society of Testing Materials), 2017. Standard Practice for Use of Apparatus for the Determination of Length Change of Hardened Cement Paste, Mortar, and Concrete, ASTM C490/C490M-17. ASTM International.

[4]Bangham DH, Razouk RI, 1937a. Adsorption and the wettability of solid surfaces. Transactions of the Faraday Society, 33:1459-1463.

[5]Bangham DH, Razouk RI, 1937b. The wetting of charcoal and the nature of the adsorbed phase formed from saturated vapours. Transactions of the Faraday Society, 33:1463-1472.

[6]Boca Santa RAA, Kessler JC, Soares C, et al., 2018. Micro structural evaluation of initial dissolution of aluminosilicate particles and formation of geopolymer material. Particuology, 41:101-111.

[7]Brue FNG, Davy CA, Burlion N, et al., 2017. Five year drying of high performance concretes: effect of temperature and cement-type on shrinkage. Cement and Concrete Research, 99:70-85.

[8]Castel A, Foster SJ, Ng T, et al., 2016. Creep and drying shrinkage of a blended slag and low calcium fly ash geopolymer concrete. Materials and Structures, 49(5):1619-1628.

[9]Chen SK, 2015. Study of Basic Mechanical Properties and Influential Factors of Metakaolin-based Geopolymer. MS Thesis, Zhejiang University, Hangzhou, China (in Chinese).

[10]Davidovits J, 1991. Geopolymers: inorganic polymeric new materials. Journal of Thermal Analysis, 37(8):1633-1656.

[11]Davidovits J, 1994. Properties of geopolymer cements. Proceedings of the 1st International Conference on Alkaline Cements and Concretes, p.131-149.

[12]de Gennes PG, Brochard-Wyart F, Quéré D, 2004. Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, Waves. Springer, New York, USA, p.1-31.

[13]Diamond S, 2000. Mercury porosimetry: an inappropriate method for the measurement of pore size distributions in cement-based materials. Cement and Concrete Research, 30(10):1517-1525.

[14]Duxson P, Provis JL, Lukey GC, et al., 2005. Understanding the relationship between geopolymer composition, microstructure and mechanical properties. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 269(1-3):47-58.

[15]Duxson P, Lukey GC, van Deventer JSJ, 2007. Physical evolution of Na-geopolymer derived from metakaolin up to 1000 °C. Journal of Materials Science, 42(9):3044-3054.

[16]Feldman RF, Sereda PJ, 1964. Sorption of water on compacts of bottle-hydrated cement. I. The sorption and length-change isotherms. Journal of Applied Chemistry, 14(2):87-93.

[17]Gallé C, 2001. Effect of drying on cement-based materials pore structure as identified by mercury intrusion porosimetry. Cement and Concrete Research, 31(10):1467-1477.

[18]Habert G, Ouellet-Plamondon C, 2016. Recent update on the environmental impact of geopolymers. RILEM Technical Letters, 1:17-23.

[19]Hagymassy Jr J, Brunauer S, Mikhail RS, 1969. Pore structure analysis by water vapor adsorption: I. t-curves for water vapor. Journal of Colloid and Interface Science, 29(3):485-491.

[20]Hansen W, 1987. Drying shrinkage mechanisms in Portland cement paste. Journal of the American Ceramic Society, 70(5):323-328.

[21]Hardjito D, Wallah SE, Sumajouw DMJ, et al., 2004. On the development of fly ash-based geopolymer concrete. Materials Journal, 101(6):467-472.

[22]Hobbs DW, 1971. The dependence of the bulk modulus, Young’s modulus, creep, shrinkage and thermal expansion of concrete upon aggregate volume concentration. Matériaux et Construction, 4(2):107-114.

[23]Huang Y, 2020. Influence of calcium bentonite addition on the compressive strength, efflorescence extent and drying shrinkage of fly-ash based geopolymer mortar. Transactions of the Indian Ceramic Society, 79(2):77-82.

[24]Khan I, Xu TF, Castel A, et al., 2019. Risk of early age cracking in geopolymer concrete due to restrained shrinkage. Construction and Building Materials, 229: 116840.

[25]Kong DLY, Sanjayan JG, Sagoe-Crentsil K, 2007. Comparative performance of geopolymers made with metakaolin and fly ash after exposure to elevated temperatures. Cement and Concrete Research, 37(12):1583-1589.

[26]Kriven WM, Bell JL, Gordon M, 2006. Microstructure and microchemistry of fully-reacted geopolymers and geopolymer matrix composites. In: Bansal NP, Singh JP, Kriven WM, et al. (Eds.), Advances in Ceramic Matrix Composites IX, Volume 153. John Wiley & Sons, Hoboken, USA, p.227-250.

[27]Kuenzel C, Vandeperre LJ, Donatello S, et al., 2012. Ambient temperature drying shrinkage and cracking in metakaolin-based geopolymers. Journal of the American Ceramic Society, 95(10):3270-3277.

[28]Kumar A, Ketel S, Vance K, et al., 2014. Water vapor sorption in cementitious materials-measurement, modeling and interpretation. Transport in Porous Media, 103(1):69-98.

[29]Langmuir I, 1918. The adsorption of gases on plane surfaces of glass, mica and platinum. Journal of the American Chemical Society, 40(9):1361-1403.

[30]Li ZM, Zhang SZ, Zuo YB, et al., 2019. Chemical deformation of metakaolin based geopolymer. Cement and Concrete Research, 120:108-118.

[31]Ling YF, Wang KJ, Fu CQ, 2019. Shrinkage behavior of fly ash based geopolymer pastes with and without shrinkage reducing admixture. Cement and Concrete Composites, 98:74-82.

[32]Ma HY, 2014. Mercury intrusion porosimetry in concrete technology: tips in measurement, pore structure parameter acquisition and application. Journal of Porous Materials, 21(2):207-215.

[33]Ma Y, Ye G, 2015. The shrinkage of alkali activated fly ash. Cement and Concrete Research, 68:75-82.

[34]MacKenzie JK, 1950. The elastic constants of a solid containing spherical holes. Proceedings of the Physical Society. Section B, 63(1):2-11.

[35]Maitland CF, Buckley CE, O’Connor BH, et al., 2011. Characterization of the pore structure of metakaolin-derived geopolymers by neutron scattering and electron microscopy. Journal of Applied Crystallography, 44(4):697-707.

[36]Mastali M, Kinnunen P, Dalvand A, et al., 2018. Drying shrinkage in alkali-activated binders–a critical review. Construction and Building Materials, 190:533-550.

[37]Mobili A, Belli A, Giosuè C, et al., 2016. Metakaolin and fly ash alkali-activated mortars compared with cementitious mortars at the same strength class. Cement and Concrete Research, 88:198-210.

[38]Mosale Vijayakumar R, 2014. Evaluating Shrinkage of Fly Ash-slag Geopolymers. MS Thesis, University of Illinois at Urbana-Champaign, Champagne, USA.

[39]Nastic M, Bentz EC, Kwon OS, et al., 2019. Shrinkage and creep strains of concrete exposed to low relative humidity and high temperature environments. Nuclear Engineering and Design, 352:110154.

[40]NDRC (National Development and Reform Commission), 2004. Standard Test Method for Drying Shrinkage of Mortar, JC/T 603-2004. National Standards of the People’s Republic of China (in Chinese).

[41]Novais RM, Ascensão G, Ferreira N, et al., 2018. Influence of water and aluminium powder content on the properties of waste-containing geopolymer foams. Ceramics International, 44(6):6242-6249.

[42]Panda B, Tan MJ, 2018. Experimental study on mix proportion and fresh properties of fly ash based geopolymer for 3D concrete printing. Ceramics International, 44(9):10258-10265.

[43]Pinson MB, Masoero E, Bonnaud PA, et al., 2015. Hysteresis from multiscale porosity: modeling water sorption and shrinkage in cement paste. Physical Review Applied, 3(6):064009.

[44]Punurai W, Kroehong W, Saptamongkol A, et al., 2018. Mechanical properties, microstructure and drying shrinkage of hybrid fly ash-basalt fiber geopolymer paste. Construction and Building Materials, 186:62-70.

[45]Rahier H, Wastiels J, Biesemans M, et al., 2007. Reaction mechanism, kinetics and high temperature transformations of geopolymers. Journal of Materials Science, 42(9):2982-2996.

[46]Sadat MR, Bringuier S, Asaduzzaman A, et al., 2016. A molecular dynamics study of the role of molecular water on the structure and mechanics of amorphous geopolymer binders. The Journal of Chemical Physics, 145(13):134706.

[47]Si RZ, Dai QL, Guo SC, et al., 2020. Mechanical property, nanopore structure and drying shrinkage of metakaolin-based geopolymer with waste glass powder. Journal of Cleaner Production, 242:118502.

[48]Thokchom S, Ghosh P, Ghosh S, 2009. Effect of water absorption, porosity and sorptivity on durability of geopolymer mortars. Journal of Engineering and Applied Sciences, 4(7):28-32.

[49]Turner LK, Collins FG, 2013. Carbon dioxide equivalent (CO2-e) emissions: a comparison between geopolymer and OPC cement concrete. Construction and Building Materials, 43:125-130.

[50]van Jaarsveld JGS, van Deventer JSJ, Lukey GC, 2002. The effect of composition and temperature on the properties of fly ash-and kaolinite-based geopolymers. Chemical Engineering Journal, 89(1-3):63-73.

[51]Wallah SE, Rangan BV, 2006. Low-calcium Fly Ash-based Geopolymer Concrete: Long-term Properties. Curtin University of Technology, Perth, Australia.

[52]Wang Q, Zhang CY, Ding ZY, et al., 2010. Research on shrinkage of slag-based geopolymer concrete. Materials Review, 24(10):65-67 (in Chinese).

[53]White CE, Provis JL, Llobet A, et al., 2011. Evolution of local structure in geopolymer gels: an in situ neutron pair distribution function analysis. Journal of the American Ceramic Society, 94(10):3532-3539.

[54]Wittmann FH, 1973. Interaction of hardened cement paste and water. Journal of the American Ceramic Society, 56(8):409-415.

[55]Xiang JC, Liu LP, Cui XM, et al., 2019. Effect of fuller-fine sand on rheological, drying shrinkage, and microstructural properties of metakaolin-based geopolymer grouting materials. Cement and Concrete Composites, 104: 103381.

[56]Yang T, Zhu HJ, Zhang ZH, 2017. Influence of fly ash on the pore structure and shrinkage characteristics of metakaolin-based geopolymer pastes and mortars. Construction and Building Materials, 153:284-293.

[57]Ye HL, Radlińska A, 2016. A review and comparative study of existing shrinkage prediction models for Portland and non-Portland cementitious materials. Advances in Materials Science and Engineering, 2016:2418219.

[58]Young T, 1832. An essay on the cohesion of fluids. Proceedings of the Royal Society of London, 1:171-172.

[59]Yousefi Oderji S, Chen B, Ahmad MR, et al., 2019. Fresh and hardened properties of one-part fly ash-based geopolymer binders cured at room temperature: effect of slag and alkali activators. Journal of Cleaner Production, 225:1-10.

[60]Zheng L, Wang W, Shi YC, 2010. The effects of alkaline dosage and Si/Al ratio on the immobilization of heavy metals in municipal solid waste incineration fly ash-based geopolymer. Chemosphere, 79(6):665-671.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

Please provide your name, email address and a comment





Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - Journal of Zhejiang University-SCIENCE