A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Durability studies on concrete columns confined with advanced fibre composites
This paper presents the durability performance of FRP-confined concrete cylinders and FRP-PVC hybrid concrete specimens under wet/dry and freeze/thaw environments. The following conclusions can be drawn: 1. The two different types of epoxy systems used for the FRP-confined concrete cylinders, Type A and Type B, produced similar results for the exposed and unexposed cylinders, with respect to strength, ductility, and failure behaviour. Both types of the epoxy systems remained very effective up to failure. 2. The confined cylinders exposed to freeze/thaw cycles showed some erosion and cracks on the top and bottom surfaces which resulted in a reduction in strength. These cracks were produced by freeze/thaw exposure since the concrete was not protected by the FRP composites in those areas. However, the FRP composites themselves did not show degradation by freeze/thaw exposure. 3. Concrete confined with PVC-CFRP showed no loss in strength after 200 and 400 cycles of wet/dry. However, their ductility was diminished due to the decrease in axial strain after 400 cycles of wet/dry exposures. Concrete confined with PVC-GFRP and PVC-AFRP showed a loss in strength and axial strain only after 400 wet/dry cycles. 4. Overall comparisons of PVC-FRP confined specimens showed that the PVC-CFRP tubes appeared to give the maximum confining efficiency after freeze/thaw exposure, and PVC-GFRP the least. 5. The 200 freeze/thaw cycles appeared to have insignificant effect on the strength and ductility of all specimens. However, a reduction in strength was apparent after 400 freeze/thaw cycles. In addition, the 400 cycles of freeze/thaw resulted in a significant reduction in the axial strain of the PVC-GFRP and PVC-AFRP concrete specimens. In general the reduction in strain was less in the PVC-CFRP concrete specimens.
Durability studies on concrete columns confined with advanced fibre composites
This paper presents the durability performance of FRP-confined concrete cylinders and FRP-PVC hybrid concrete specimens under wet/dry and freeze/thaw environments. The following conclusions can be drawn: 1. The two different types of epoxy systems used for the FRP-confined concrete cylinders, Type A and Type B, produced similar results for the exposed and unexposed cylinders, with respect to strength, ductility, and failure behaviour. Both types of the epoxy systems remained very effective up to failure. 2. The confined cylinders exposed to freeze/thaw cycles showed some erosion and cracks on the top and bottom surfaces which resulted in a reduction in strength. These cracks were produced by freeze/thaw exposure since the concrete was not protected by the FRP composites in those areas. However, the FRP composites themselves did not show degradation by freeze/thaw exposure. 3. Concrete confined with PVC-CFRP showed no loss in strength after 200 and 400 cycles of wet/dry. However, their ductility was diminished due to the decrease in axial strain after 400 cycles of wet/dry exposures. Concrete confined with PVC-GFRP and PVC-AFRP showed a loss in strength and axial strain only after 400 wet/dry cycles. 4. Overall comparisons of PVC-FRP confined specimens showed that the PVC-CFRP tubes appeared to give the maximum confining efficiency after freeze/thaw exposure, and PVC-GFRP the least. 5. The 200 freeze/thaw cycles appeared to have insignificant effect on the strength and ductility of all specimens. However, a reduction in strength was apparent after 400 freeze/thaw cycles. In addition, the 400 cycles of freeze/thaw resulted in a significant reduction in the axial strain of the PVC-GFRP and PVC-AFRP concrete specimens. In general the reduction in strain was less in the PVC-CFRP concrete specimens.
Durability studies on concrete columns confined with advanced fibre composites
Untersuchungen zur Dauerhaftigkeit von mit modernen, faserverstärkten Kunststoffen umhüllten Betonstützpfeilern
Toutanji, Hossam A. (author) / Zhao, Liangying (author) / Isaacs, Gregory J. (author)
2007
21 Seiten, 13 Bilder, 8 Tabellen, 10 Quellen
Article (Journal)
English
Beton , Stützpfeiler , Einschließung , Umhüllung , glasfaserverstärkter Kunststoff , carbonfaserverstärkter Kunststoff , Polyvinylchlorid , Dauerhaftigkeit , Druckfestigkeit , Axialkompression , Frost-Tauwechsel-Prüfung , Wechselbeanspruchung , Befeuchten , Trocknen , Festigkeitsverlust , Duktilität , Verminderung
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