静置状態におけるフレッシュコンクリートのブリーディングモデルに関する理論的研究

概要

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In this study, the author considered the bleeding of fresh concrete as a self-weight consolidation process, which is resulted from that the particle fabric has no enough tightness to support the fresh concrete's weight or and a vertical pressure acting on its upper surface. By analyzing the ability of particle fabric and hydrate of cement to support the normal stress acting on the maximum shear plane, a time-dependent pore water pressure formula was obtained. Then based on the Kozeny-Carman's permeability model, a permeability formula was proposed for fresh concrete, in which effective void ratio caused by free mixing water is used. Moreover, using Darcy's law, formulas of bleeding capacity and bleeding rate were induced for fresh concrete, and a time-dependent bleeding model was further proposed. Also, the author verified the bleeding model by comparing the test results and the calculating values of 8 series of fresh concrete having different specimen's heights, mix proportions, and vertical pressures.
日本建築学会の論文