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Creep and Durability of Environmentally Conditioned FRP-RC Beams Using Fiber Optic Sensors

i2 Technologies, 909 E. Las Colinas Blvd., Dallas, TX 75239

Amir Mirmiran

Department of Civil Engineering, North Carolina State University, Raleigh, NC 27695

Accelerated environmental conditioning increases creep rate of FRP bars and results in 2%-3% moisture absorption. Presence of salt in the solution does not affect creep rate of FRP-RC beams or moisture absorption of FRP bars. Effect on strength and stiffness of FRP is about 3% for saline solutions and none for moisture. Environmental conditioning lowers post-cracking stiffness of the beams due to stiffness degradation of FRP and loss of bond between FRP and concrete. Fiber optic sensors are less sensitive than foil gages to temperature effects, but must be handled properly during construction and secured carefully against harsh environments.

Key Words: composites • concrete • creep • durability • fiber optics • FRP

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