This paper is intended to study the effects of the mix proportion on the Theological figures, strength and shrinkage ratio of the high-fluidity concrete sing portland blast-furnace slag cement and fly ash. The relationship between the mix proportion and the fluidity etc. of the concrete was investigated regarding several experimental factors such as kind of fly ash, mixing ratio of fly ash to portland blast-furnace slag cement, mixing ratio of super plasticizer, and so on. The Theological 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 on the fluidity 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. 2) The plastic viscosity and the yield value of the concrete which mixed Type II fly ash to 15% are smaller than those of the concrete using-portland blast-furnace slag cement with little addition quantity of super plasticizer.
