Production and characterization of geopolymers based on mixed compositions of metakaolin and coal ashes

被引：51

作者：

Papa, E. ^{[1
]}

Medri, V. ^{[1
]}

Landi, E. ^{[1
]}

Ballarin, B. ^{[2
]}

Miccio, F. ^{[1
]}

机构：

[1] Inst Sci & Technol Ceram CNR ISTEC, Natl Res Council Italy, I-48018 Faenza, Italy

[2] Univ Bologna, ALMA MATER STUDIORUM, Dipartimento Chim Ind Toso Montanari, I-40136 Bologna, Italy

来源：

MATERIALS & DESIGN | 2014年 / 56卷

关键词：

Coal ash; Geopolymer; Metakaolin; Alkali activation; Fluidized bed; FLY-ASH; CEMENT; COMBUSTION; MICROSTRUCTURE; EMISSIONS; EVOLUTION; MINERALS; BOILERS; WATER;

D O I：

10.1016/j.matdes.2013.11.054

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mixtures of coal ashes from pulverized coal combustion (PCC) or fluidized bed combustion (FBC) and metakaolin were used to synthetize geopolymers. Upon full characterization of the raw powders (chemical and mineralogical composition), geopolymerization tests were conducted using an alkali aqueous solution of NaOH/Na2SiO3 at different dilutions. The produced geopolymers were subjected to SEM analysis, as well as to leaching, thermal and mechanical tests. The final microstructure and the properties of the geopolymers indicate that FBC ash can be conveniently used as a partially reactive filler in combination with the metakaolin powder. The composite material has good thermal performance and compressive strength (similar to 30 MPa) suitable for the building sector. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：409 / 415

页数：7

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