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TitleMonitoring the early stiffness development in epoxy adhesives for structural strengthening
Author(s)Granja, José Luís Duarte
Fernandes, Pedro Miguel Gomes
Benedetti, Andrea
Azenha, Miguel
Sena-Cruz, José
Non-destructive testing
Elastic modulus
Cyclic tensile test
A. Epoxy/epoxides
C. Non-destructive testing
D. Cure/hardening
D. Elastic modulus
Issue dateJun-2015
JournalInternational Journal of Adhesion and Adhesives
CitationGranja, J. L., Fernandes, P., Benedetti, A., Azenha, M., & Sena-Cruz, J. (2015). Monitoring the early stiffness development in epoxy adhesives for structural strengthening. International Journal of Adhesion and Adhesives, 59, 77-85. doi: 10.1016/j.ijadhadh.2015.02.005
Abstract(s)The present work aimed to assess the early-age evolution of E-modulus of epoxy adhesives used for Fibre-Reinforced Polymer (FRP) strengthening applications. The study involved adapting an existing technique devised for continuous monitoring of concrete stiffness since casting, called EMM-ARM (Elasticity Modulus Monitoring through Ambient Response Method) for evaluation of epoxy stiffness. Furthermore, monotonic tensile tests according to ISO standards and cyclic tensile tests were carried out at several ages. A comparison between the obtained results was performed in order to better understand the performance of the several techniques in the assessment of stiffness of epoxy resins. When compared to the other methodologies, the method for calculation of E-modulus recommended by ISO standard led to lower values, since in the considered strain interval, the adhesive had a non-linear stress-strain relationship. The EMM-ARM technique revealed its capability in clearly identifying the hardening kinetics of epoxy adhesives, measuring the material stiffness growth during the entire curing period. At very early ages the values of Young's modulus obtained with quasi-static tests were lower than the values collected by EMM-ARM, due to the fact that epoxy resin exhibited a significant visco-elastic behaviour.
Publisher version
AccessOpen access
Appears in Collections:ISISE - Artigos em Revistas Internacionais

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