Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Long term durability of strengthened concrete with externally applied FRP composites
This investigation is concerned with the determination of durability of strengthened concrete using externally applied fiber-reinforced-polymer (FRP) composites for infrastructure rehabilitation. Four different systems of FRP composites were subjected to single, dual and multi-variable environmental exposures. Glass fiber (GFRP) and carbon fiber (CFRP) composites with either an epoxy-resin or urethane-resin matrix were used. Single exposure tests consisted of evaluation of stored specimens under isolated conditions; dual exposure tests consisted of accelerated freeze-thaw cycling in salt water at 23% concentration by weight evaluated at 50 and 112 cycles; multi-variable exposure tests consisted of natural environmental exposure evaluation of test units stored at the State Street Bridge in Salt Lake City, Utah, after 365 days. Four experimental test series are evaluated including bond, drum peel, beam and compressive cylinder tests; two types of surface preparation were used to improve bond strength, and two types of concrete compressive strength. The majority of FRP composite systems for each of the test series have shown some degree of degradation after 50 accelerated freeze-thaw cycles. FRP-confined concrete columns have shown up to 11% axial compression strength reduction. GFRP-water jetted strengthened concrete beams increased the failure load and effective strain in the FRP composite after been exposed; no significant changes were observed for CFRP-water jetted beams.
Long term durability of strengthened concrete with externally applied FRP composites
This investigation is concerned with the determination of durability of strengthened concrete using externally applied fiber-reinforced-polymer (FRP) composites for infrastructure rehabilitation. Four different systems of FRP composites were subjected to single, dual and multi-variable environmental exposures. Glass fiber (GFRP) and carbon fiber (CFRP) composites with either an epoxy-resin or urethane-resin matrix were used. Single exposure tests consisted of evaluation of stored specimens under isolated conditions; dual exposure tests consisted of accelerated freeze-thaw cycling in salt water at 23% concentration by weight evaluated at 50 and 112 cycles; multi-variable exposure tests consisted of natural environmental exposure evaluation of test units stored at the State Street Bridge in Salt Lake City, Utah, after 365 days. Four experimental test series are evaluated including bond, drum peel, beam and compressive cylinder tests; two types of surface preparation were used to improve bond strength, and two types of concrete compressive strength. The majority of FRP composite systems for each of the test series have shown some degree of degradation after 50 accelerated freeze-thaw cycles. FRP-confined concrete columns have shown up to 11% axial compression strength reduction. GFRP-water jetted strengthened concrete beams increased the failure load and effective strain in the FRP composite after been exposed; no significant changes were observed for CFRP-water jetted beams.
Long term durability of strengthened concrete with externally applied FRP composites
Saenz, Nicolas (Autor:in) / Pantelides, Chris P. (Autor:in) / Reaveley, Lawrence D. (Autor:in)
2004
14 Seiten, 16 Quellen
Aufsatz (Konferenz)
Englisch
Durability and Long-Term Behavior of Reinforced Concrete Beams Strengthened with FRP Composites
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