Microstructural development in an ultrafine cement - Part II

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. ? 2 001 Elsevier Science Ltd. All rights reserved.