Skip to main content
SpringerLink
Log in

Effect of temperature on RC elements strengthened with CFRP

  • Original Article
  • Published:
Materials and Structures Aims and scope Submit manuscript

Abstract

The strengthening of RC elements with CFRP is a technique that has been acquiring more and more potential. The bond between the CFRP reinforcement and the concrete support is usually made with epoxy adhesives. However, it is here that the integrity of the system can be affected, namely by exposure to high temperatures. In order to study the effect of an increase of air temperature on the behaviour of the epoxy adhesive, CFRP strengthened RC and reference RC specimens were tested. After cyclical thermal exposures, with temperatures rising between 20 and 80°C, specimens were subjected either to compressive shear tests or bending tests. The results demonstrated that epoxy adhesive exhibits poor behaviour when subjected to increased temperatures, causing important bond deterioration. The improvement achieved with the CFRP reinforcement tends to disappear with an increase of the environment temperature. So, the thermal resistance of this strengthened system cannot be considered very high. However, the inclusion of insulating materials can be a good solution to protect the strengthened RC elements. Among tested materials, the foamed polyurethane showed the best behaviour.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Fig. 15
Fig. 16
Fig. 17
Fig. 18
Fig. 19
Fig. 20

Similar content being viewed by others

References

  1. American Concrete Institute (1996) State-of-the-Art Report on Fiber Reinforced Plastic (FRP) Reinforcement for Concrete Structures. ACI Committee 440. Farmington Hills, Michigan, USA

    Google Scholar 

  2. American Concrete Institute (2000) Guide for design and construction of externally bonded FRP systems for strengthening concrete structures, ACI Committee 440. Farmington Hills, Michigan, USA

    Google Scholar 

  3. Beeldens A, Gemert DV, Aguiar B (2000) Aging factors affecting adhesion. In: RILEM TC 151, Adhesion technology: physical and chemical aspects, Chapter 6. Bagneux, France

  4. Malvar LJ (1998) Durability of composites in concrete, CDCC’98, First international conference on durability of composites for construction. In: Benmokrane R, Rahman H (eds) University of Sherbrooke, Quebec, Canada, pp 361–372

  5. Malvar LJ, Joshi NR, Beran JA, Novinson T (2003) Environmental effects on the short-term bond of carbon fiber-reinforced polymer (CFRP) composites. J Compos Constr, EBSCO, February, pp 58–63

  6. Tadeu A, Branco F (2000) Shear tests of steel plates epoxy-bonded to concrete under temperature. J Mater Civil Eng, ASCE, February, pp 74–80

  7. Gamage J, Al-Mahaidi R, Wong M (2006), Bond characteristics of CFRP plated concrete members under elevated temperatures. Compos Struct, 75, Elsevier, pp 199–205

    Google Scholar 

  8. Fiber Reinforced Polymer Task Group (2001) Externally bonded FRP reinforcement for RC structures, Technical Report, FIB Bulletin 14, Task Group, International Federation for Structural Concrete (FIB), Lausanne, Switzerland

  9. Hutchinson A, Quinn J (1999) Materials. In: Hollaway L, Leeming M (eds) Strengthening of reinforced concrete structures. Woodhead Publishing Limited, Cambridge

    Google Scholar 

  10. American Concrete Institute (1997) Guide for the application of epoxy and latex adhesives for bonding freshly mixed and hardened concretes, ACI Committee 503. Farmington Hills, Michigan, USA

    Google Scholar 

  11. American Concrete Institute (1992) Guide for the selection of polymer adhesives with concrete, ACI Committee 503. Farmington Hills, Michigan, USA

    Google Scholar 

  12. European Committee for Standardisation–EN 13733 (2002), Products and systems for the protection and repair of concrete structures—test methods—determination of the durability of structural bonding agents. Brussels, Belgium

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Civil Engineering Department, University of Minho, Campus of Azurém, Guimaraes, 4800-058, Portugal

    J. B. Aguiar, A. Camões & N. F. Vaz

Authors
  1. J. B. Aguiar
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Camões
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. N. F. Vaz
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to A. Camões.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Aguiar, J.B., Camões, A. & Vaz, N.F. Effect of temperature on RC elements strengthened with CFRP. Mater Struct 41, 1133–1142 (2008). https://doi.org/10.1617/s11527-007-9311-4

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1617/s11527-007-9311-4

Keywords

Search

Navigation