Effects SiO2/Na2O molar ratio on mechanical properties and the microstructure of nano-SiO2 metakaolin-based geopolymers

被引：230
作者：
Gao, Kang [1 ]
Lin, Kae-Long [2 ]
Wang, DeYing [1 ]
Hwang, Chao-Lung [3 ]
Shiu, Hau-Shing [2 ]
Chang, Yu-Min [4 ]
Cheng, Ta-Wui [5 ]
机构：
[1] Yan Tai Univ, Dept Environm & Mat Engn, Yantai, Peoples R China
[2] Natl Ilan Univ, Dept Environm Engn, Ilan 26047, Taiwan
[3] Natl Taiwan Univ Sci & Technol, Dept Construct Engn, Taipei, Taiwan
[4] Natl Taipei Univ Technol, Inst Environm Engn & Management, Taipei 106, Taiwan
[5] Natl Taipei Univ Technol, Dept Mat & Mineral Resources Engn, Taipei 106, Taiwan
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2014年 / 53卷
关键词：
Geopolymer; Metakaolin; Nano-SiO2; SiO2/Na2O molar ratio; Compressive strength; Microstructure; FLY-ASH; KAOLIN; PARAMETERS; BINDER;
D O I：
10.1016/j.conbuildmat.2013.12.003
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
An alkali-activating solution plays an important role in dissolving Si and Al atoms to form geopolymer precursors and aluminosilicate material. This study explores the effects of the SiO2/Na2O molar ratio (1.0-2.0) on the properties of nano-SiO2 metakaolin-based geopolymers. The setting time, compressive strength, mercury intrusion porosimetry (MIP), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) are investigated to study the properties of the geopolymers. The results show that the compressive strength increased, and that the products of geopolymerization filled pores with curing time, causing the microstructure to become dense. Moreover, a nano-SiO2 metakaolin-based geopolymer sample with a SiO2/Na2O ratio of 1.5 exhibited more strength, higher density, and less porosity. Applying the nano-SiO2 to a geopolymer enhances compactness, improves uniformity, and increases strength. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：503 / 510
页数：8
相关论文
共 29 条
[1]   Environmental, physical and structural characterisation of geopolymer matrixes synthesised from coal (co-)combustion fly ashes [J].
Alvarez-Ayuso, E. ;
Querol, X. ;
Plana, F. ;
Alastuey, A. ;
Moreno, N. ;
Izquierdo, M. ;
Font, O. ;
Moreno, T. ;
Diez, S. ;
Vazquez, E. ;
Barra, M. .
JOURNAL OF HAZARDOUS MATERIALS, 2008, 154 (1-3) :175-183
[2]   Effect of colloidal nano-silica on the mechanical and physical behaviour of waste-glass cement mortar [J].
Aly, M. ;
Hashmi, M. S. J. ;
Olabi, A. G. ;
Messeiry, M. ;
Abadir, E. F. ;
Hussain, A. I. .
MATERIALS & DESIGN, 2012, 33 :127-135
[3]   Coal fly ash as raw material for the manufacture of geopolymer-based products [J].
Andini, S. ;
Cioffi, R. ;
Colangelo, F. ;
Grieco, T. ;
Montagnaro, F. ;
Santoro, L. .
WASTE MANAGEMENT, 2008, 28 (02) :416-423
[4]   Evolution of binder structure in sodium silicate-activated slag-metakaolin blends [J].
Bernal, Susan A. ;
Provis, John L. ;
Rose, Volker ;
Mejia de Gutierrez, Ruby .
CEMENT & CONCRETE COMPOSITES, 2011, 33 (01) :46-54
[5]   Comparative study on the characteristics of fly ash and bottom ash geopolymers [J].
Chindaprasirt, Prinya ;
Jaturapitakkul, Chai ;
Chalee, Wichian ;
Rattanasak, Ubolluk .
WASTE MANAGEMENT, 2009, 29 (02) :539-543
[6]   An XRD study of the effect of the SiO2/Na2O ratio on the alkali activation of fly ash [J].
Criado, M. ;
Fernandez-Jimenez, A. ;
de la Torre, A. G. ;
Aranda, M. A. G. ;
Palomo, A. .
CEMENT AND CONCRETE RESEARCH, 2007, 37 (05) :671-679
[7]   GEOPOLYMERS AND GEOPOLYMERIC MATERIALS [J].
DAVIDOVITS, J .
JOURNAL OF THERMAL ANALYSIS, 1989, 35 (02) :429-441
[8]  
Davidovits J., 1999, Geopolymer
[9]   Composition and microstructure of alkali activated fly ash binder:: Effect of the activator [J].
Fernández-Jiménez, A ;
Palomo, A .
CEMENT AND CONCRETE RESEARCH, 2005, 35 (10) :1984-1992
[10]   Influence of the starting kaolin on alkali-activated materials based on metakaolin. Study of the reaction parameters by isothermal conduction calorimetry [J].
Granizo, ML ;
Blanco-Varela, MT ;
Palomo, A .
JOURNAL OF MATERIALS SCIENCE, 2000, 35 (24) :6309-6315
123