A STUDY ON RELATIONSHIP BETWEEN UNEVEN DISTRIBUTIONS OF COARSE AGGREGATE AND ESTIMATION OF PRESSURE LOSS IN HIGH FLUIDITY CONCRETE FLOWING BETWEEN REINFORCING BARS

摘要

In this paper, an experiment was carried out to predict determining the quantity of the pressure loss in high fluidity and self compacting concrete as it flows between reinforcing bars in formwork, and we experimented to measure of pressure loss in the concrete flowing between reinforcing bars, and analyzed geometrically the distribution of the coarse aggregate particles and gaps among these particles in the section of the concrete nearby reinforcing bars obstacles. Then, we tried to make the model of the mechanism of occurring and increasing the pressure loss nearby reinforcing bars obstacles. Then we tried to investigate the model experimentally. As the result of these examinations, these were become clear as follows; The quantities of the pressure loss in high fluidity and self compacting concrete flowing between reinforcing bars was influenced by the quantitative of the unit absolute volume of coarse aggregate and the spacing between reinforcing bars. And it was found that in the case of changing the condition of the passability through spaces, the pressure loss was estimated quantitatively by the image analysis of the cutting hardened concrete nearby reinforcing bars obstacles, it was estimated to the radius and length of thin pipes assumed to forming by gaps of coarse aggregate.