Improvements in setting characteristics and strength development were achie
ved in an ultrafine cement with a specific surface area > 7000 cm(2)/g by a
dding small dosages of a solid retarder and a solid HRWRA. Incorporation of
20% superfine fly ash resulted in lower heat generation and better flowabi
lity. The microstructural development of these mixes was studied using SEM/
EDXA. Calcium hydroxide formation as a function of hydration age was quanti
fied by XRD and TGA. Their paste porosity at 28 days was also measured. ? 2
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