Steel fiber reinforced concrete

Abstract The task of evaluating what is unknown about fiber reinforced cement or concrete is difficult. One should identify the important aspects which must be investigated, and to a large extent this becomes the opinion of the writer. However, it does appear that more thinking is needed in respect of the details of the basic mechanics of ductile fiber reinforcing of a brittle material. Important developments have been made which can be built upon so that the prediction of the mechanical and physical properties will be reliable for design. Considerable research and development effort is needed on the nature of interfacial shear stress (bond) between the fiber and matrix, the interaction among fibers because of their close proximity on the bond strength and debonding mechanism, the upper and lower limits of the fiber aspect ratio and the volume of fibers that will provide the synergistic properties desired. More consideration must be given to the magnitude of the size effect of test data extrapolated to prototype structural units. A corequisite is to establish the appropriate test specimens and methods for quality assurance for fiber-reinforced cement or concrete products.

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