Thermal limits for external bonding repair method on structural surfaces exposed to the environment

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

Luís Filipe Pereira Juvandes (Author) FEUP; Paulo Alexandre da Silveira Costeira Marques da Silva (Author) Other; Maria Margarida Cuco Alpalhão (Author) Other; Joaquim José Maia Gonçalves Moreira (Author) Other; Margarida José Moreira da Silva (Author) Other

Conference proceedings International

Title: 5th International Conference on Advanced Composite, Materials in Bridges and Structures (ACMBS-V)

Pages: 1-9

5th International Conference on Advanced Composite, Materials in Bridges and Structures

Manitoba, Canadá, 22 a 24 de Setembro de 2008

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

CORDIS: Technological sciences > Engineering > Civil engineering > Structural engineering

Other information

Abstract (EN): To guarantee the overall safety of a strengthened structure by bonding technique with epoxy resins it is important to control the hygrothermal gradients in the period of service life because they can interfere on the behaviour of the bonding agent. The objective of the study is to evaluate the glass transition temperature of commercial resins in different environments in order to be able to compare it with the ambient temperatures registered on the surface of the civil engineering infrastructures in Portugal. The strengthening application of FRP materials to existing concrete structures shows that is difficult to develop an adhesive that fulfils all the different specifications of repairs. Therefore, there is a great variability of epoxy formulas, with possible modifications, in order to improve the adhesive’s response to the desired application. However, if the temperature of the structural materials, due to the environmental exposition, approaches the Glass Transition Temperature (Tg) of the adhesive then the elastic modulus of the polymer is significantly reduced and the material begins to loose its ability to transfer stresses from the concrete to the FRP.

Language: Portuguese

Type (Professor's evaluation): Scientific