INFLUENCE OF RAW MATERIALS CHARACTERISTICS AND PROCESSING PARAMETERS ON THE STRENGTH OF GEOPOLYMER CEMENTS BASED ON FLY ASH

被引：13

作者：

Badanoiu, Alina ^{[1
]}

Voicu, Georgeta ^{[1
]}

机构：

[1] Univ Politehn Bucuresti, Fac Appl Chem & Mat Sci, Bucharest, Romania

来源：

ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL | 2011年 / 10卷 / 05期

关键词：

compressive strength; fly ash; geopolymer; metakaolin; thermal treatment; ACTIVATION;

D O I：

10.30638/eemj.2011.091

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aim of this study was to assess the physical, chemical, mineralogical and microstructural characteristics of a group of Romanian fly ashes, in order to determine its reactivity as precursors for geopolymer cements preparation. Compressive strength test was used to assess the reactivity of the fly ashes vs. alkali solutions (sodium hydroxide and sodium silicate) and to optimize the geopolymer processing parameters. Several methods, such as thermal treatment, sieving of fly ashes or addition of metakaolin as solid component, were studied, in the attempt to increase the fly ashes reactivity vs. the alkali activator. The results obtained demonstrated that three out of four types of studied fly ashes are suitable to be used as solid component for geopolymer cements preparation; the removal of coarse fraction (consisting mainly in unburnt carbon) from fly ash, by sieving, improved the compressive strengths developed by the geopolymer mortar.

引用

页码：673 / 681

页数：9

共 17 条

[1]

[Anonymous], 1999, OFFICIAL J, V182, P1

[2]

Davis John M., 2008, P377, DOI 10.1007/978-0-387-70805-8_14

[3] Geopolymer technology:: the current state of the art [J].

Duxson, P. ;

Fernandez-Jimenez, A. ;

Provis, J. L. ;

Lukey, G. C. ;

Palomo, A. ;

van Deventer, J. S. J. .

JOURNAL OF MATERIALS SCIENCE, 2007, 42 (09) :2917-2933

[4] Thermal conductivity of metakaolin geopolymers used as a first approximation for determining gel interconnectivity [J].

Duxson, Peter ;

Lukey, Grant C. ;

van Deventer, Jannie S. J. .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2006, 45 (23) :7781-7788

[5]

EN, 2000, EN 197-1: 2000

[6]

Eurpean Standard, 2007, 45012005A12007 EN

[7] Alkaline activation of metakaolin-fly ash mixtures:: Obtain of Zeoceramics and Zeocements [J].

Fernandez-Jimenez, A. ;

Monzo, M. ;

Vicent, M. ;

Barba, A. ;

Palomo, A. .

MICROPOROUS AND MESOPOROUS MATERIALS, 2008, 108 (1-3) :41-49

[8] Characterisation of fly ashes.: Potential reactivity as alkaline cements [J].

Fernández-Jiménez, A ;

Palomo, A .

FUEL, 2003, 82 (18) :2259-2265

[9] Plerosphere and its role in reduction of emitted fine fly ash particles from pulverized coal-fired power plants [J].

Goodarzi, F. ;

Sanei, H. .

FUEL, 2009, 88 (02) :382-386

[10]

Odler I., 2004, Lea 's Chemistry of Cement and Concrete, V4th ed., P241

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