Abstract
Twenty-five prismatic concrete specimens with 125 × 125 mm (5 × 5 in) square cross-section and 400 mm (16 in) height made with normal-weight high-strength concrete were tested under quasi-static axial compressive loading to investigate the effect of various parameters on the strength and deformation characteristics of confined high-strength concrete. 20 specimens were confined by circular and square continuous spirals and provided with a protective concrete cover. This transverse reinforcement alone provided confinement for the concrete specimen, i. e. there was no longitudinal reinforcement. In addition to the confined specimen, five plain concrete specimens were tested to assess the actual characteristics of the unconfined concrete. The main parameters considered were compressive strength of the concrete and the amount and yield strength of the transverse steel. The primary purpose of the confinement was to increase the maximum strength, corresponding strain and toughness of the confined high strength concrete. It was observed that the characteristics of the confining steel influenced the behaviour of the confined concrete.
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