Prestressing low clinker structural concrete elements by ultra-high modulus carbon fibre reinforced polymer tendons

Abstract The combination of low clinker high-performance concrete (LCHPC) and ultra-high modulus (UHM) carbon fibre reinforced polymer (CFRP) tendons was recently proposed for prestressed structural elements. 70% reduction in cement content resulting limited creep shrinkage the LCHPC comparison to a conventional (HPC) very high UHM-CFRP tendon stiffness (> 509 GPa) were expected impact mechanical behaviour such structures. This study focuses on 3 m-long beam specimens during prestressing, hardening 4 point-bending experiments. Fibre optic sensors implemented inside CFRP measure strain those stages digital image correlation system employed monitor 4-point-bending tests. After 28 days, recipe, despite much smaller environmental footprint, did not show measurable differences prestress loss HPC. prestressing tendons, because their stiffness, showed both higher losses around 40% average nearly doubled transfer length. However, they increased beam`s maximum load-bearing capacity by 21% 47% less deflection at failure beams with standard (UTS)-CFRP tendons.