The effect of Na+ and H2O on structural and mechanical properties of coal gangue-based geopolymer: Molecular dynamics simulation and experimental study

被引：38

作者：

Wang, Rui ^{[1
]}

Wang, Jingsong ^{[2
]}

Song, Qingchun ^{[2
]}

机构：

[1] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China

[2] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 268卷

关键词：

Na+; H2O; Coal gangue-based geopolymer; Molecular structure; Mechanical properties; Molecular dynamics simulation; ASH-BASED GEOPOLYMER; ALKALINE ACTIVATOR; METAKAOLIN; STRENGTH; TIME;

D O I：

10.1016/j.conbuildmat.2020.121081

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The aim of this work is to study the impacts of Na+ and H2O on structural and mechanical properties of coal gangue-based geopolymer by experiment and molecular dynamics. Geopolymers were prepared by coal gangue and mixed solution of NaOH and water glass. Then X-ray fluorescence (XRF) and X-ray diffraction (XRD) were utilized to characterize the main chemical composition and crystalline phase of geopolymer after 28d curing. Moreover, Na2Si2O5 glass was firstly proposed to establish the molecular structure of geopolymers with different Na/Al and H2O/Al. Structural optimization and molecular dynamics simulation were implemented under the specific force field. Simulated XRD pattern, energy and temperature curves, radial distribution function (RDF), hydrogen bond, bond angle distribution, mean square displacement (MSD) and elastic modulus of geopolymer were calculated and analyzed. Results indicated that with the increase of Na+ and H2O content, structure of geopolymer became more stable and mechanical properties were improved significantly. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：11

共 28 条

[1] Geopolymers obtained from bottom ash as source of aluminosilicate cured at room temperature [J].

Antunes Boca Santa, Rozineide A. ;

Soares, Cintia ;

Riella, Humberto Gracher .

CONSTRUCTION AND BUILDING MATERIALS, 2017, 157 :459-466

[2] Effect of cure temperature on the formation of metakaolinite-based geopolymer [J].

Aredes, F. G. M. ;

Campos, T. M. B. ;

Machado, J. P. B. ;

Sakane, K. K. ;

Thim, G. P. ;

Brunelli, D. D. .

CERAMICS INTERNATIONAL, 2015, 41 (06) :7302-7311

[3] Fly ash-based boroaluminosilicate geopolymers: Experimental and molecular simulations [J].

Bagheri, Ali ;

Nazari, Ali ;

Sanjayan, Jay G. ;

Rajeev, Pathmanathan ;

Duan, Wenhui .

CERAMICS INTERNATIONAL, 2017, 43 (05) :4119-4126

[4] Using calcium carbide residue as an alkaline activator for glass powder-clay geopolymer [J].

Bilondi, Meysam Pourabbas ;

Toufigh, Mohammad Mohsen ;

Toufigh, Vahid .

CONSTRUCTION AND BUILDING MATERIALS, 2018, 183 :417-428

[5] GEOPOLYMERS - INORGANIC POLYMERIC NEW MATERIALS [J].

DAVIDOVITS, J .

JOURNAL OF THERMAL ANALYSIS, 1991, 37 (08) :1633-1656

[6]

Davidovits J., 2008, Geopolymer Chemistry and Applications, V171, p208AD

[7] Preparation and characterization of a novel porous silicate material from coal gangue [J].

Gao, Yajun ;

Huang, Huijuan ;

Tang, Wenjing ;

Liu, Xiaoyao ;

Yang, Xinyu ;

Zhang, Jianbin .

MICROPOROUS AND MESOPOROUS MATERIALS, 2015, 217 :210-218

[8] Development of a high strength fly ash-based geopolymer in short time by using microwave curing [J].

Graytee, Ahmed ;

Sanjayan, Jay G. ;

Nazari, Ali .

CERAMICS INTERNATIONAL, 2018, 44 (07) :8216-8222

[9] NEUTRON-SCATTERING FROM VITREOUS SILICA .4. TIME-OF-FLIGHT DIFFRACTION [J].

GRIMLEY, DI ;

WRIGHT, AC ;

SINCLAIR, RN .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1990, 119 (01) :49-64

[10] Preparation and characterization of acid-based geopolymer using metakaolin and disused polishing liquid [J].

Guo, Chang-ming ;

Wang, Kai-tuo ;

Liu, Meng-yi ;

Li, Xuan-hai ;

Cui, Xue-min .

CERAMICS INTERNATIONAL, 2016, 42 (07) :9287-9291

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