振動締固めによるコンクリート骨材粒の分離程度の測定と二, 三の考察

概要

論文の詳細を見る
In this paper,segregation tendency of aggregate particles with different size fractions caused by self-floating or sinking was investigated. After washing analysis of concrete samples picked from every portion in the vertical direction of a prismatic specimen,sieve analyses of fine and coarse aggregates were made and the unit contents of the particles retained on each of sieve series were determined. The segregation tendency in a portion was evaluated by the ratio (R_i) of the unit content to that in the specified mix. If the particle content increases or decreases as compared with the specified one, R_i>1 or R_i<1, and the closer R_i to unity,the milder the tendency. The subtraction of the ratio in the top portion from that in the bottom portion was adopted as the segregation factor (SA) of the particles for the whole specimen in the height direction. If the content of particles with a certain size fraction is highest in the top portion due to self-floating and decreases down ward, SA<0, and if the content is lowest due to self-sinking and increases downward, SA>0. The higher the absolute value,the more the segregation tendency,and the distribution of the particles corresponding to SA=0 remains unchanged. The conclusions obtained were as follows;
1986-10-15