コンクリート中の欠陥の発生について : 打設後の分離がコンクートの内部構造におよぼす影響・III

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In the previous papers, the structural anisotropy of concrete relative to the casting direction has been characterized by tensile tests and the effects of the internal defects shown by tensile anisotropy such as the fissures under aggregates or bleeding channels were discussed. In this paper, the bleeding characteristics of fresh concrete presumed as the main cause of the anisotropy and the defects brought about by it were investigated. The conclusions obtained are as follows : (1) The quantity of bleeding water that reached the surface was less for concrete than for the mortar within the concrete. It seems that this reduction was the total amount of the internal bleeding water that never reach the surface as being disturbed by coarse aggregate particles. So this reduction-the total quantity of the internal bleeding-can be an indicater of the defects under aggregate in concrete. (2) The quantity of internal bleeding tended to increase with increasing bleeding of the mortar within concrete, with increasing volume fraction of aggregate, with increasing size of fine aggregate and with decreasing percentage of solid volume of coarse aggregate. (3) Channeled bleeding caused by heavy bleeding formed open channels in hardend concrete or mortar, and these channels more influenced the tensile behavior perpendicular to the casting direction. (4) Channeled bleeding in mortar tended to increase with increasing water/cement ratio and with decreasing sand/cement ratio.
社団法人日本建築学会の論文
1976-02-28

コンクリート中の欠陥の発生について : 打設後の分離がコンクートの内部構造におよぼす影響・III

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