Abstract
In the study for extending amount of effective use of fly ash, and taking measure of exhaustion of aggregate, the fresh properties of the concrete using high volume fly ash as a part of fine aggregate were examined. As a result of experiments, the influence of fly ash replacement as a part of fine aggregate on the mixture proportion or the fresh properties became clear. And, by applying water layer model to the experimental result, the relevance of unit water or bleeding capacity, and water layer thickness of particle surface was shown. Furthermore, in the case of concrete with same slump, it became clear that the water layer thickness became constant without depending on quality and quantity of fly ash.
