Properties of confined fibre-reinforced concrete under uniaxial compressive impact

The effect of confinement on plain and fibre-reinforced concrete (FRC) prisms subjected to uniaxial compressive impact was studied. It was found that the response of the material changed with the degree of confinement. Confined concrete exhibited more ductile behaviour, with both strength (fc′) and ultimate strain (εult) increasing with the degree of confinement. However, the elastic modulus (E) of the confined specimens was found to be about the same as or slightly lower than those of unconfined prisms. In addition, the relationship between stress and stress rate (n value) was also determined. It was found that, with confinement, the material became more rate sensitive.