A BASIC STUDY ON FLUID PREDICTION OF MORTAR WITH VARIOUS POWDERS

In the field of concrete, Fly ash and crushed stone powder which are by-product powders and limes stone powder are used as admixture materials for concrete from the viewpoint of environmental load. Then we should use by-product powders as materials of the concrete as a substitute of fine aggregate. Therefore, it is necessary to predict fluidity of the concrete with powders in large quantities. In this study, we tried a fluid evaluation of mortar with various by-products powders and a fluid prediction by grasping a fluid tendency of mortar with various powders as a part of fine aggregate, and adopted the thickness of a surplus water film theory and the relative flow area ratio as an evaluation index. We clarified when used by-product powders as a part of fine aggregate, we can use excess water film for an index. But the value of the relative flow area ratio was different because of the same thickness of a surplus water film depending on the kind of the powder. It was thought that the fluidity of mortar was able to predict by applying the correction value proposed by this study in various mixtures that used the by-product powder.