A FUNDAMENTAL STUDY ON EVALUATION OF VISCOSITY OF FRESH CONCRETE BASED ON DEFORMATION

Abstract

In this study, the evaluation method of viscosity of mortar and concrete under gravity and vibration was investigated. Based on Rankin’s earth-pressure theory and Bingham model, the estimation method for yield stress and plastic viscosity of mortar was proposed using slump flow test result. As a result, except for short deformation time case, it is thought that the proposed method can estimate the viscosity of mortar under gravity. And also, the estimation method for viscosity of mortar and concrete under vibration based on the deformation of mortar and concrete was proposed by using the driving force and the resistance of deformation. In the case of same water-cement ratio and surface area of total aggregate per unit weight of cement paste, it was found that the estimated viscosity of concrete under vibration was almost same as that of mortar.