STUDY ON THE EFFECT OF MIX PROPORTION ON THE RHEOLOGICAL CHARACTERISTIC OF HIGH-FLUIDITY CONCRETE USING FLY ASH

Abstract

This paper is intended to study the effects of the mix proportion on the theological figures of the high-fluidity concrete using fly ash. The relationship between the mix proportion and the fluidity of the concrete was investigated regarding several experimental factors such as the kind of fly ash, the mixing ratio of fly ash to the normal cement, the mixing ratio of super plasticizer and viscosity agent, and sand aggregate ratio, etc. The rheological characteristics of the high-fluidity concrete such as plastic viscosity and yield value were measured by using the J shaped flow test. The main results are as follows. 1) In case of increasing the mixing ratio of Type I fly ash and Type II fly ash, the plastic viscosity and the yield value decrease. In case of increasing the mixing ratio of Type IV fly ash, these values increase. 2) The plastic viscosity of the concrete using Type I fly ash is smaller than that of the concrete using Type II fly ash. 3) The yield value of the concrete using Type I fly ash is nearly the same as that of the concrete using Type II fly ash.