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

P. Duxson; S. W. Mallicoat; G. C. Lukey; W. M. Kriven; J. S.J. van Deventer

doi:10.1016/j.colsurfa.2006.05.044

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

P. Duxson, S. W. Mallicoat, G. C. Lukey, W. M. Kriven, J. S.J. van Deventer

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (US)
Pages (from-to)	8-20
Number of pages	13
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	292
Issue number	1
DOIs	https://doi.org/10.1016/j.colsurfa.2006.05.044
State	Published - Jan 5 2007

Keywords

Alkali effect
Alumino-silicate gel
Geopolymer
Mechanical properties
Microstructure

ASJC Scopus subject areas

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

Online availability

10.1016/j.colsurfa.2006.05.044

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

abstract = "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.",

keywords = "Alkali effect, Alumino-silicate gel, Geopolymer, Mechanical properties, Microstructure",

author = "P. Duxson and Mallicoat, {S. W.} and Lukey, {G. C.} and Kriven, {W. M.} and {van Deventer}, {J. S.J.}",

note = "Funding Information: Financial support is gratefully acknowledged from the Australian Research Council (ARC), the Particulate Fluids Processing Centre (PFPC), a Special Research Centre of the Australian Research Council, and the United States Air Force Office of Scientific Research (AFOSR), under STTR Grant number F49620-02 C-010 in association with The University of Illinois at Urbana-Champaign and Siloxo Pty Ltd., Melbourne, Australia. The NANO-MRF through the Travel Access Program (TAP), Katie Levick and Paul Munroe at the University of NSW Electron Microscopy Suite, are thanked for facilitation of the FIB specimen preparation. Dr. Peng Ju Lin assisted in obtaining the TEM micrographs presented in this work.",

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AU - Lukey, G. C.

AU - Kriven, W. M.

AU - van Deventer, J. S.J.

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N2 - 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.

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

Abstract

Keywords

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