The effect of alkali and Si/Al ratio on the development of mechanical properties of metakaolin-based geopolymers

被引：695

作者：

Duxson, P.

Mallicoat, S. W.

Lukey, G. C.

Kriven, W. M.

van Deventer, J. S. J. ^{[1
]}

机构：

[1] Univ Melbourne, Dept Chem & Biomol Engn, Melbourne, Vic, Australia

[2] Univ Illinois, Dept Mat Sci & Engn, Champaign, IL 61820 USA

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2007年 / 292卷 / 01期

基金：

澳大利亚研究理事会;

关键词：

geopolymer; alumino-silicate gel; alkali effect; mechanical properties; microstructure;

D O I：

10.1016/j.colsurfa.2006.05.044

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Statistical analysis of a systematic series of geopolymers with varying alkali type (sodium and potassium) and Si/Al ratio after 7 and 28 days ageing has been used as a basis for observing the development of mechanical properties with time. Minimal change in the compressive strength of specimens was generally observed in specimens of different alkali or between 7 and 28 days of ageing. However, mixed-alkali specimens with high Si/Al ratio exhibited significant increases in strength, while pure alkali specimens displayed decreased strength. The development of Young's modulus of geopolymers between 7 and 28 days was observed to be dependent on alkali, with the Young's moduli of Na-specimens decreasing at low Si/Al ratio, but increasing at high Si/Al ratio, while K-specimens exhibited the opposite effect. Mixed-alkali specimens all exhibited nominal change in Young's moduli, without any significant effect of Si/Al ratio being observed. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：8 / 20

页数：13

共 29 条

[1] Synthesis and thermal behaviour of potassium sialate geopolymers [J].