Abstract
In the proceeding report, sedimentation experiment of high slump concrete was made, and authors induced the equuation of sedimentation rate of high slump concrete. This report made clear the relation between the mixing proportion of high slump concrete and the sedimentation rate. The method of it draws here; In the first, standard mixing proportion diagrams are made, then, from those diagrams, representative points in several kinds of mixing proportion are selected to calculate sedimentation rate by foregoing equation, and through those calculated values and mixing proportion, the tendency between the two is pursued. The conclusions drawn here, will be summed up as follows, (1) Uuder the same condition of water-cement ratio, the larger slump is the larger sedimentation rate of concrete. (2) In the case of the same slump and the same water-cement ratio, using the more fine sand, ususlly, sedimentation rate becomes larger, but in the fine sand attended with sand ratio it decomes smaller. (3) Contrary to mentioned above, in the case of fine sand, when sand ratio becomes the larger, sedimentation rate more rapidly increase. (4) Usually, sedimentation rate increases when water-cement ratio becomes larger under the other conditions are same. Though (1) and (4) are inagreement with general conclusions, but the valut of sedimentation rate varies with the sand used or by the change of the mixing proportion, specially, in the case of using fiine sand. By this study, we can select the mixing proportion of high slump concrete that gives the minimum quantity of sedimentation rate.
