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Title |
Fiber Orientation Impacts on the Flexural Behavior of Steel Fiber Reinforced High Strength Concrete
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Keywords |
초고강도 콘크리트 ; 강섬유 ; 섬유 방향성 ; 이미지 프로세싱 ; 휨강도 ultra high strength concrete ; steel fiber ; fiber orientation ; image processing ; flexural strength |
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Abstract |
To evaluate the fiber orientation characteristics and estimate its effect on the flexural strength of steel fiber reinforced ultra high strength concrete with directions of concrete placing, we developed an image processing technique and carried out the flexural test to quantify the effect of fiber orientation characteristics on the flexural strength as well. The image processing technique developed in this study could evaluate quantitatively the fiber orientation property by the use of dispersion coefficient, the number of fibers in a unit area, and fiber orientation. It was also found that the fiber orientation characteristics were dependent on the direction of concrete placing. Fiber orientation characteristic was revealed to strongly affect the ultimate flexural strength, while hardly affecting the first cracking strength. Theoretical model for flexural strength was applied to compare with test results, which exhibited a good agreement.
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