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Experimental study on basic mechanical properties of directionally distributed steel fiber reinforced concrete

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Document pages: 11 pages

Abstract: Due to the limitation of current construction technology, directional distribution steel fiber reinforced concrete (SFRC) can not be widely used, which hinders the study of its mechanical properties. With the development of new construction technologies such as self compacting concrete or 3D printing, directionally distributed steel fiber reinforced concrete has found a new development opportunity. In this study, the basic mechanical properties of ordinary concrete, randomly distributed SFRC and directionally distributed SFRC are tested, compared and analyzed. In directionally distributed steel fiber reinforced concrete, the difference between damage modes parallel to and perpendicular to the steel fiber direction was evaluated. When the fiber volume fraction is high and the compression is applied directly perpendicular to the fiberon, as the loading increases, the transverse deformation of the specimen is constrained by the fibres. When the compression is applied parallel to the fibre direction, the fibre cannot effectively constrain the transverse deformation of the specimens. When the volume fraction of directionally distributed steel fibres was 1.6 , the elastic modulus of the directionally distributed steel fibres was 39 higher than that of ordinary concrete. Comparison of the experimental values of the elastic modulus with those estimated by existing calculation methods revealed that a modification of the current calculation theories may be required to calculate the changes in the elastic modulus of directionally distributed SFRC with a high volume fraction of steel fibres.

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