Over the past decades, the addition of jackets has been used as an effective technique for improving the performance of deficient reinforced concrete columns. Among the various methods that have been developed, jacketing with Fiber-Reinforced Polymers is the most widely used due to their high strength-to-weight ratio, superior durability in adverse environments, and fast implementation. However, due to several limitations such as the high cost of epoxy resins, poor vapor permeability, and un-applicable with wet surfaces, alternative systems have emerged. Strain-Hardening Cementitious Composites (SHCC) systems have been proven as an innovative technique to strengthen and retrofit reinforced concrete structures. These cementitious layers feature improved ductility, and energy absorption capacity and are compatible with concrete. This study aims to investigate the effect of High-Tensile-Strength SHCC (HTS-SHCC) jackets on concrete columns confinement. This innovative confinement layer was produced by replacing 40% of cement with Limestone Calcined Clay (LC2). Additionally, the study explores the utilization of two fibre phases: a Polyethylene (PE) fibres phase and a hybrid fibres phase (consisting of PE and steel fibres). The experimental program was comprised of testing 18 specimens with square and circular columns under uniaxial compression loading. For each type of cross‐section, columns were confined with two mixes of HTS-SHCC with different fibre phases. Overall, the confined columns exhibited higher load-carrying capacity than their control unconfined ones. Moreover, the confined columns exhibited a notable increase in ductility. The confining effect of HTS-SHCC layers was more pronounced in the circular columns compared with the square ones.