Abstract
This paper reports on the tensile behaviour of fibre-reinforced densified small particle (FR-DSP) cement containing high volume fractions of steel fibres (more than 2%) and main reinforcement (1–3%) in direct tension. Approximately 30 tensile plate specimens were made. Parameters investigated include a very high strength cement-based matrix with a compressive strength of more than 150 MPa, fibre volume fraction within the matrix, and main reinforcement ratio. It is shown that incorporating large volume fractions of steel fibres (more than 2% by volume) in DSP composite results in a dramatic increase in matrix tensile strength (up to 100%). Adding a minimum of 1% main reinforcement (by volume) near the specimens' edges retards the initiation of cracks induced by edge effects and thus results in a further increase in ductility and tensile strength. It is shown that DSP composites can exhibit tensile strengths up to 25 MPa at peak strains ranging from 0·2% to 0·4%.
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