Abstract
sifcon displays significantly different strengths in different directions due to its anisotropic nature. Early attempts to determine the shear strength of sifcon involved tests on deep beams and direct shear specimens. Different shear strengths were measured. In this research, the shear properties of sifcon were examined by testing cored cylindrical specimens under pure torsion. Specimens of two different diameters and fibre aspect ratios were tested. Deep beams of sifcon were tested in bending to obtain the shear resistance properties. Anisotropy in sifcon was investigated by coring specimens from a slab of sifcon with the fibres oriented both perpendicular and parallel to the direction of coring. The torsion of cored samples was selected as the testing technique both for the ease of obtaining specimens at a job site, and for the simplicity of analysis. This paper discusses the experimental programme and design implications when a high volume of fibres (up to 12% by volume) is used in a cementitious composite.
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