High temperature compatibility of CFRP versus steel reinforcement for concrete

Cristian Maluk, Luke Bisby, Giovanni P. Terrasi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

Results are presented from a comprehensive experimental study to assess the occurrence of heat-induced longitudinal splitting cracks in concrete specimens reinforced with CFRP or steel when exposed to severe heating from one side, as would likely occur in a fire in a building. Tests were performed on large-and medium-scale precast CFRP reinforced or prestressed specimens. Large-scale specimens were tested in a standard fire resistance test, while medium-scale specimens were tested using a novel Heat-Transfer Rate Inducing System (H-TRIS) which controls thermal exposure by imposing a time-history of incident heat flux at a specimen's exposed surface. The formation of thermally-induced longitudinal splitting cracks and failure of the concrete cover to provide sufficient confining action, and thus sufficient bond strength, is shown to be more likely for FRP reinforced or prestressed concrete elements than for those reinforced or prestressed with steel. This appears to be at least partly due to thermo-mechanical incompatibility between CFRP reinforcement and concrete; formation of heat-induced longitudinal splitting cracks is related to rapid thermal expansion of CFRP tendons relative to the surrounding concrete. Many aspects of bond performance at elevated temperature remain poorly understood, and these require additional investigation before FRP reinforced or prestressed elements can be used in fire-rated applications with confidence.

Original languageEnglish
Title of host publicationAmerican Concrete Institute, ACI Special Publication
EditorsRaafat El-Hacha
PublisherAmerican Concrete Institute
Pages55-76
Number of pages22
Volume2014-April
EditionSP 322
ISBN (Electronic)9781510871274
Publication statusPublished - 1 Jan 2014
EventTowards Sustainable Infrastructure with Fiber Reinforced Polymer Composites: A Symposium Honoring Khaled Soudki at the ACI Fall 2014 Convention and ACI Spring 2015 - Kansas City, United States
Duration: 12 Apr 201516 Apr 2015

Conference

ConferenceTowards Sustainable Infrastructure with Fiber Reinforced Polymer Composites: A Symposium Honoring Khaled Soudki at the ACI Fall 2014 Convention and ACI Spring 2015
Country/TerritoryUnited States
CityKansas City
Period12/04/1516/04/15

Keywords / Materials (for Non-textual outputs)

  • Analytical modeling
  • CFRP
  • Concrete
  • CTE
  • Furnace test
  • H-TRIS
  • Longitudinal splitting cracks

Fingerprint

Dive into the research topics of 'High temperature compatibility of CFRP versus steel reinforcement for concrete'. Together they form a unique fingerprint.

Cite this