A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Durability evaluation of glass fiber reinforced-polymer-concrete bonded interfaces
The external reinforcement of concrete beams using wet-laid FRP fabrics can result in significant increases in flexural and shear strength. However, there is insufficient information on the long term durability of the interfacial bond between FRP sheets or plates and concrete. In the present paper, a mechanistic approach based on fracture mechanics concepts and local bond shear stress-slip relationships is presented to quantify the effects of environmental degradation. The assessment has focused on the effects of four different environmental conditionings in conjunction with sustained load. Freeze-thaw, air-conditioned laboratory environment of roughly 20-25 deg C, real-time outdoor/courtyard exposure, elevated temperature/dry, consisting of 50 - 60 deg C temperature. The following is a summary of the conclusions: Debonding of the GFRP (glass fiber reinforced polymer) sheet from the concrete is the dominant failure mode. A decrease in strength is noted for specimens subjected to cycles of dry freezing and wet thawing. Four local shear stress-slip models have been applied to strain distribution data and the linear-hardening and linear-softening model is found to best represent the experimental strain data. Among all of the environments, the longest duration freeze/thaw and elevated temperature/dry environments cause the most severe degradation of the interfacial fracture energy, peak shear stress, and slip at complete debonding.
Durability evaluation of glass fiber reinforced-polymer-concrete bonded interfaces
The external reinforcement of concrete beams using wet-laid FRP fabrics can result in significant increases in flexural and shear strength. However, there is insufficient information on the long term durability of the interfacial bond between FRP sheets or plates and concrete. In the present paper, a mechanistic approach based on fracture mechanics concepts and local bond shear stress-slip relationships is presented to quantify the effects of environmental degradation. The assessment has focused on the effects of four different environmental conditionings in conjunction with sustained load. Freeze-thaw, air-conditioned laboratory environment of roughly 20-25 deg C, real-time outdoor/courtyard exposure, elevated temperature/dry, consisting of 50 - 60 deg C temperature. The following is a summary of the conclusions: Debonding of the GFRP (glass fiber reinforced polymer) sheet from the concrete is the dominant failure mode. A decrease in strength is noted for specimens subjected to cycles of dry freezing and wet thawing. Four local shear stress-slip models have been applied to strain distribution data and the linear-hardening and linear-softening model is found to best represent the experimental strain data. Among all of the environments, the longest duration freeze/thaw and elevated temperature/dry environments cause the most severe degradation of the interfacial fracture energy, peak shear stress, and slip at complete debonding.
Durability evaluation of glass fiber reinforced-polymer-concrete bonded interfaces
Bewertung der Dauerhaftigkeit der verbundenen Grenzflächen von glasfaserverstärktem Kunststoff und Beton
Jia, Junhui (author) / Boothby, Thomas E. (author) / Bakis, Charles E. (author) / Brown, Tennisha L. (author)
Journal of Composites for Construction ; 9 ; 348-359
2005
12 Seiten, 10 Bilder, 6 Tabellen, 23 Quellen
Article (Journal)
English
Durability Evaluation of Glass Fiber Reinforced-Polymer-Concrete Bonded Interfaces
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