Estimation of the rheological constants of high-fluidity concrete by using the thickness of excess paste

Abstract

In 1940, Kennedy found that the workability of concrete depends on the thickness of the excess cement paste, which is defined as the difference between the volume of the cement paste and the volume of the voids in the dry rodded mixed aggregate. It is thought that the mix design of concrete in fluid can be established by investigating how each factor of the mix design affects the consistency of concrete. The purpose of our research is to get a fundamental knowledge for the establishment design of high-fluidity concrete based on rheology. In this study, flesh concrete is considered to be in a two-phase flow consisted of aggregates and cement paste. As a result of experiment, the rheological constants, plastic viscosity and yield value, of high-fluidity concrete could be estimated by using the relative thickness of excess paste.