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*1  *2 *3 Naoki MISHIMA, Shutaro OMURA and Shigemitsu HATANAKA  In recent years, it becomes necessary to estimate the workability and consistency with good accuracy. Main purpose of this study is to establish a rheological model of fresh concrete that can consider the properties of dilatancy. Fundamental experiments using coaxial cylindrical rotation rheometer were carried out on the behavior of fresh mortar. From the visualized experiment on the inside of fresh mortar, it was clarified that there is some complicated deformation in the fresh mortar. Also, from the measurement of shear stress, it was demonstrated that rheological properties of fresh mortar are greatly influenced by the change of shear stress which is thought to be caused by the dilatancy. Further, a strong relationship was clarified between the amounts of change in shear strain rate and shear stress.

STUDY ON EVALUATION OF DILATANCY PROPERTIES OF FRESH MORTAR BY COAXIAL CYLINDRICAL ROTATION RHEOMETER