Abstract
In this paper the reaction heat development of alkali activated aluminosilicates is studied by an isothermal heat flow calorimeter. The highest reaction activity is observed during two hours after mixing. The hydration heat power at early time is influenced mainly by the composition of tested mixtures involving ceramic dust as precursor and different amounts of sodium hydroxide and water glass as activators and by temperature.
Highlights
Alkali-activated aluminosilicates (AAA) can be utilized as alternative binders due to their low environmental impact
Binary AAA system composed of waste ceramic dust and metakaolin was tested by Rovnaník et al [1]
The isothermal heat flow calorimeter KC 01 [7] was applied for the measurement of hydration heat development in the analyzed alkali activated aluminosilicates
Summary
Alkali-activated aluminosilicates (AAA) can be utilized as alternative binders due to their low environmental impact. Among the aluminosilicate sources solid wastes or industrial by-products can be utilized. Used and studied is a fly ash, other frequently used materials are blast furnace slag, metakaolin, or ceramic dust powder. Binary AAA system composed of waste ceramic dust and metakaolin was tested by Rovnaník et al [1]. A synergic effect between metakaolin and ceramic powder was shown. Another binary system composed of fly ash and slag was tested by Jang et al [2]. Higher contents of slag increased the compressive strength of alkali-activated fly ash/slag pastes but caused rapid setting and crack appearance due to autogeneous shrinkage [2]
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