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It is widely known that the surface fragile layer of concrete is formed by the influence of bleeding and compaction of fresh concrete and that it causes the difference in quality between the surface fragile layer of concrete and the inner layer of concrete. In this research the factor which was believed to have an influence on the forming of this surface fragile layer was the thickness of the member section, and on this hypothesis the experiment was conducted. The experiment clarified that the Bleeding which seems to influence the forming of the fragile surface layer as the member section hardens increased and became most noticeable in the areas near the mold. It also showed a change in the durability of concrete due to the Scaling resistivity and the material movement resistivity declining as the thickness of the member section in the experiment was increased. The more the thickness of the member section was increased, the greater the difference in the Scaling and material movement resistivity. It was concluded that the bleeding defines the thickness of the member section, increases it , and is most apparent in the area around the mold.

EFFECTS ON FORMING OF FRAGILE LAYER OF SURFACE BY THICKNESS OF MEMBER SECTION OF CONCRETE