Rheological Model for Reversed Cyclic Interaction between Mortar and Coarse Aggregate in Self-Compacting Concrete

Abstract

High flowability and resistance to segregation are required in self-compacting concrete. Not only the flowing analysis but also the segregation analysis are necessary in the workability predictions. The segregation behavior should be indicated quantitatively in the segregation analysis. In this research, not the property of mortar itself such as yield value and plastic viscosity but the interaction property between coarse aggregate and mortar content when these materials are segregated is discussed. A ball was subjected to reversed cyclic movement in the mortar and the resistant force against the relative movement was measured in the experiments. From experimental results, it was clarified that the interaction behavior could not be expressed by Bingham model and a new rheological model was proposed to express the interaction behavior. A method to estimate the sedimentation of coarse aggregate was appeared as an example of application of this rheological model.