Posttensioned Anchorage Zone Enhancement with Fiber-Reinforced Concrete

Mechanical properties of reactive powder concrete containing industrial and waste steel fibres at different ratios under compression

“…On the other hand, the addition of WF to RPC has achieved an increase in the compressive strength compared to NF by 9.9%, 15.6%, 21.0% and 10.6% when WF were added to the RPC mixture at 1%, 2% 3% and 4%, respectively. In general the increase in the compressive strength with the addition of the steel fibre compared to the reference is attributed to the role of the steel fibre in bridging cracks which prevent the initiation and propagation of cracks, leading to increasing the load carrying capacity of the concrete and inhibiting the disintegration of the concrete, simultaneously [45,46]. Also, the decrease in the compressive strength of WF at 4% and DF at 3% and 4% could be attributed to the uneven distribution of fibres in the mixtures [47].…”

Investigação Numérica Da Importância De Armaduras De Fretagem Em Vigas Pós-Tracionadas Não Aderentes

“…As armaduras de fretagem, utilizadas em forma de espirais, estribos secundários, ou a combinação de ambos, são necessárias para resistir às tensões de tração transversais existentes no elemento estrutural devido à aplicação da força de protensão. Essas tensões podem causar o fendilhamento longitudinal no elemento protendido, necessitando, portanto, da utilização de armaduras de reforço da zona de ancoragem (HAROON et al, 2006).…”

Reinforcement of orthogonal ties in steel-fiber-reinforced reactive powder concrete anchorage zone

“…It helps in enhancing the tensile strength due to its effect of bridging the cracks in the fibers, whereby the force is redistributed among the concrete and the steel fibers. Moreover, steel fibers play a role in inhibiting cracking and resisting material disintegration (American Concrete Institute (ACI), 1996; Haroon et al, 2006; Johnson, 2006). To decrease the risk of anchorage failure and increase the efficiency of construction, it is desirable to add steel fibers into the RPC anchorage zone.…”