The behavior of concrete columns confined by UHP-FRCC jacketing
Fantilli, A.P.; Nishiwaki, T.; Lisi, V.; Longo, M.
Appears on pages(s):
Ultra-High Performance – Fiber Reinforced Cementitious Composites (UHP-FRCC), High Volume Fly Ash (HVFA), Confined concrete, Mechanical properties, Ecological properties.
Ultra-High Performance – Fiber Reinforced Cementitious Composites (UHP-FRCC) show
excellent mechanical performances, and therefore can be effectively used to retrofit concrete
structures. Similarly to the traditional Reinforced Concrete (RC) jacketing, also when a layer
of UHP-FRCC is applied on an existing column a sort of confinement can be obtained.
Accordingly, the purpose of this study is to investigate the performances of plain concrete
cylinders, confined by UHP-FRCC and subjected to uniaxial compression. In some of the
layers, high volume fly ash has also been used to replace part of the cement and reduce the
environmental impact. As a result, the compressive strength of the concrete core can be
enhanced by the presence of UHP-FRCC layer, but when partially using fly-ash, the
confinement effect of the jacket reduced. To determine the best solution among the different
proposed options, the eco-mechanical analysis was also carried out.