Mix design factors and strength prediction of metakaolin-based geopolymer

Geopolymer is a promising alternative binder to Portland cement. However, the importance of mix design parameters affecting the mechanical properties of geopolymer has yet to be quantitatively assessed. This work evaluates the significance of the four common mix design parameters, namely Si/Al (mola...

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Bibliographic Details
Published in:Ceramics international Vol. 43; no. 14; pp. 11433 - 11441
Main Authors: Lahoti, Mukund, Narang, Pratik, Tan, Kang Hai, Yang, En-Hua
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.10.2017
Subjects:
Attribute evaluation
Electron microscopy
Porosity
Strength
Attribute evaluation
Porosity
Electron microscopy
Strength
ISSN:0272-8842, 1873-3956
Online Access:Get full text
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Summary:Geopolymer is a promising alternative binder to Portland cement. However, the importance of mix design parameters affecting the mechanical properties of geopolymer has yet to be quantitatively assessed. This work evaluates the significance of the four common mix design parameters, namely Si/Al (molar ratio), water/solids (mass ratio), Al/Na (molar ratio) and H2O/Na2O (molar ratio), in determining compressive strength of metakaolin-based geopolymers through experiments and statistical analyses. In addition, machine learning-based classifiers were engaged for strength predictions. Results showed that Si/Al ratio is the most significant parameter followed by Al/Na ratio. Unlike ordinary Portland cement system, water/solids ratio is not the chief factor governing strength of metakaolin-based geopolymers. Machine learning-based classifiers were able to predict the compressive strength with high precision. The strength predictions can potentially guide preliminary mix proportioning of metakaolin-based geopolymers to achieve required strength grade without going through tedious (trial and error) mix formulation.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.06.006