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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/29518

Title: Alternative Test Methods for Evaluating Fly Ash for use in Concrete
Authors: de Groot, Andre Pieter
Advisor: Hooton, Robert Douglas
Department: Civil Engineering
Keywords: fly Ash
concrete
alkali-silica reaction
ASR
Issue Date: 23-Aug-2011
Abstract: Fly Ash was tested in relation to its ability to mitigate alkali-silica reaction, its contribution to strength, electrical resistance and heat release with the aim of recommending improvements to fly ash specifications. ASTM C 1567 accelerated mortar bar test results were in agreement with an expansion limit of 0.10 % at 14 days. A non-standard alkali leaching test showed that with high alkali fly ashes as replacement level increases the amount of alkalis leached increases while prism expansions decrease. Measures of pozzolanic activity can be improved by measuring against non-pozzolanic fillers, This requires high replacement levels to reduce statistical variability. Isothermal calorimetry tests showed that high calcium fly ashes can lead to delays in hydration, these delays can be reduced by calcium hydroxide additions. Calcium sulphate additions can also improve hydration.
URI: http://hdl.handle.net/1807/29518
Appears in Collections:Master

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