An Investigation of the Nature of Carbon in Fly Ash and its Interactions with Air Entraining Agent

摘要

The majority of BET nitrogen surface area resides with carbon particles. Fly ashes with comparable LOI's can have significantly different surface areas. Calculated carbon surface area correlates well with both mortar air and foam index results yielding an inverse and positive relationship, respectively. It should be noted, however, that nitrogen adsorption is insensitive to differences in carbon surface chemistry, which can also influence adsorption of air entraining admixtures.