Composition, strength and workability of alkali-activated metakaolin based mortars

► We study the joint effect of several factors on the workability and mechanical strength of alkali-activated metakaolin based mortars. ► The workability decreases with the concentration of sodium hydroxide and increases with the amount of calcium hydroxide and superplasticizer. ► The use of 3% of s...

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Bibliographic Details
Published in:Construction & building materials 2011-09, Vol.25 (9), p.3732-3745
Main Authors: Pacheco-Torgal, F., Moura, D., Ding, Yining, Jalali, Said
Format: Article
Language:English
Subjects:
Alkali-activated mortars
Analysis
Calcium hydroxide
Cement
Composition
Construction materials
Corrosion and anti-corrosives
Economic conditions
Flexural strength
Forecasts and trends
Mechanical strength
Metakaolin
Mortar
Mortars
Slaked lime
Sodium hydroxide
Strength
Supply and demand
Workability
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Summary:► We study the joint effect of several factors on the workability and mechanical strength of alkali-activated metakaolin based mortars. ► The workability decreases with the concentration of sodium hydroxide and increases with the amount of calcium hydroxide and superplasticizer. ► The use of 3% of superplasticizer combined with a calcium hydroxide content of 10%, allows improving the mortar flow from less than 50% to over 90%. This study has investigated the joint effect of several factors on the workability and mechanical strength of alkali-activated metakaolin based mortars. The factors analysed through a laboratory experiment of 432 specimens, pertaining to 48 different mortar mixes were, sodium hydroxide concentration (10 M, 12 M, 14 M, 16 M), the superplasticizer content (1%, 2%, 3%) and the percentage substitution of metakaolin by calcium hydroxide in the mixture (5%, 10%). The results show that the workability decreases with the concentration of sodium hydroxide and increases with the amount of calcium hydroxide and superplasticizer. The results also show that the use of 3% of superplasticizer, combined with a calcium hydroxide content of 10%, allows improving the mortar flow from less than 50% to over 90%, while maintaining a high compressive and flexural strength.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2011.04.017