Bond response of NSM CFRP strips in concrete under sustained loading and different temperature and humidity conditions

emara-composites-PhD

Bond response of NSM CFRP strips in concrete under sustained loading and different temperature and humidity conditions

The Composite Structures issue of May 2018 includes a paper by Emara, M. et al. named Bond response of NSM CFRP strips in concrete under sustained loading and different temperature and humidity conditions. It presents the result of an experimental study on the performance of NSM reinforcements for concrete structures. They consist of strips of composite material attached into grooves at the surface of the structural element using an adhesive bond. The focus has been set on the bond-slip when the bond is loaded for a long period of time. Under different load levels, the effect of temperature has been found to be more determining than that of humidity.

 

Paper information

Title Bond response of NSM CFRP strips in concrete under sustained loading and different temperature and humidity conditions.
Authors: M. Emara, L. Torres, M. Baena, C. Barris, X. Cahís.
Journal, Volume, Page, Year: Composite Structures, Vol. 192, pp. 1-7, 2018
DOI:

https://doi.org/10.1016/j.compstruct.2018.02.048

 

Highlights

  • The time-dependent bond-slip response of the adhesively bonded joint was found to be influenced by the adhesive.
  • At 20°C, increasing the humidity had no significant effect on the slip evolution with time when sustained loading level equal to 25% was applied. Meanwhile, a significant effect was observed at sustained loading level equal to 50% within the same test conditions.
  • Whatever the bonded lengths used at 20°C, increasing the sustained loading level from 25% to 50% increased the total slip by almost the double at any time along the testing period.
  • The effect of increasing humidity was more evident in the case of specimens tested at high temperature than in those tested at normal temperature (20°C).
  • Temperature seemed to have greater effect, compared to that of humidity, on the time-dependent bond-slip response of NSM CFRP laminates in concrete.

 

Project and Funding

  • Relevant projects: BIA2013-46944-C2-2-P, MC-ITN2013-607851.
  • Funding institutions: Spanish Government (Ministerio de Economía y Competividad), The European Network for Durable Reinforcement and Rehabilitation Solutions (endure), a Marie, Sklodowska Curie Initial Training Network.