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This behaviour of low- and medium-strength concrete specimens confined with carbon fibre-reinforced polymer (CFRP) was analysed in three loading cycles. In some cases, stress levels were achieved that produced intemal microcracks, which allowed residual rigidity and the behaviour of completely microcraked concrete specimens to be studied. The specimens were subsequently tested to compression to the fracture point. Specimens reinforced in accordance with no manufacturing defects (100% CFRP reinforcement) and major manufacturing defects (50% CFRP reinforcement) were assessed for effectiveness and behaviour of the confined elements in less than ideal conditions. Results show that confinement was higher in low-resistance concretes, that the behaviour of reinforced specimens was unaffected by defective implementation conditions and that the reinforced specimens were less rigid than the non-reinforced specimens when tested up to 40% of ultimate fracture strength. Estudio experimental del comportamiento a compresión de probetas de hormigón de resistencias bajas\udy medias confinadas con tejidos de fibras de carbono y con defectos muy importantes de ejecución.\udEn este trabajo\udse estudia el comportamiento de hormigones de resistencias bajas y medias confinados con CFRP. Se han\udrealizado 3 ciclos de carga llegando en algunos casos a niveles de tensión que han microfisurado internamente\udel hormigón, lo que ha permitido estudiar la rigidez residual y el comportamiento de probetas confinadas con\udel hormigón totalmente microfisurado. Posteriormente todas las probetas se han ensayado a compresión hasta\udrotura. Los refuerzos se han realizado con buenas condiciones de ejecución y simulando grandes defectos para\udpoder evaluar la eficacia de los elementos confinados cuando las condiciones de ejecución no son las correctas.\udLos resultados muestran que el efecto de confinamiento es superior en hormigones poco resistentes, el comportamiento de las probetas reforzadas es poco sensible a grandes defectos de ejecución y su rigidez es inferior al de\udlas probetas originales cuando se ensayan hasta el 40% de la tensión de rotura

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Compressive strength behaviour of low- and medium-strength concrete specimens confined with carbon fibres in defective implementation conditions: an experimental study