EFFECTS OF SEVERE ENVIRONMENTAL EXPOSURE ON COMPRESSIVE BEHAVIOR OF CFRP-CONFINED CONCRETE

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Title: EFFECTS OF SEVERE ENVIRONMENTAL EXPOSURE ON COMPRESSIVE BEHAVIOR OF CFRP-CONFINED CONCRETE

Author(s): Panida

Publication: TCA

Volume: 4

Issue: 2

Appears on pages(s): 14-27

Keywords: Confinement, Axial Compression, CFRP, Severe Environment

Date: 6/1/2016

Abstract:
The objective of this research is to investigate the influences of severe environment on the behavior and strength of CFRP-confined concrete under uniaxial compression. Monotonic and cyclic compressive tests were conducted on Ø20x45 cm cylindrical concrete samples exposed to laboratory-simulated wet-dry cycles in chloride environment for 6, 13 and 19 months. It has been found that the compressive strength of CFRP-confined concrete was enhanced when compared to unconfined concrete. For the CFRP-confined specimens, compressive strength under monotonic compression increased initially after being exposed to wet-dry cycles for 6 months, but started to deteriorate after longer exposure. On the other hand, compressive strength of the CFRP-confined specimens under cyclic compression increased for all durations of environmental exposure. The environmental reduction factor (ܥா) obtained from the strains in CFRP at failure in specimens exposed to wet-dry cycles were higher than the recommended value in the ACI 440-2R Guideline. Therefore, the recommended values are safe for design of FRP strengthening in both normal and severe environments. In addition, upon inspection of concrete samples with steel reinforcement using the half-cell potential method, it has been suggested that CFRP confinement could help reduce the tendency of steel corrosion in chloride environment.


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