Hybrid Composite Rebars For Smart Concrete Structures
In reinforced concrete (RC) structures, steel reinforcing bars (rebars) corrode with time and thus reduce their life span. Composite rebars can be used in lieu of steel rebars to overcome this problem. The conventional composite rebars designed to take tensile force are composed of unidirectional fibers in a resin matrix, and are linearly elastic till failure; thus providing a brittle behavior. The problems of corrosion and brittle behavior can be solved by using a composite rebar which fails gradually under tension. The rebar consists of a hybrid composite system in conjunction with helical fibers. The hybrid system gives the rebar its initial stiffness and enables pseudo-yielding at lower strains. As the strain increases, the load is gradually transferred from the hybrid core to the helical fibers, which enables the rebar to undergo large elongations before failure. Embedded fiber optic sensors in the rebar can be used for health monitoring over a long period of time. The proof of concept and preliminary test results are described in the paper.
R. K. Krishnamoorthy et al., "Hybrid Composite Rebars For Smart Concrete Structures," Proceedings of SPIE - The International Society for Optical Engineering, vol. 3043, pp. 65 - 71, Society of Photo-optical Instrumentation Engineers, May 1997.
The definitive version is available at https://doi.org/10.1117/12.274631
Civil, Architectural and Environmental Engineering
Mechanical and Aerospace Engineering
Electrical and Computer Engineering
Keywords and Phrases
Carbon fibers; Composite rebar; Corrosion; Fiber optic sensors; Helical fibers; Hybrid composite; Pseudo-ductility; Reinforced concrete
International Standard Serial Number (ISSN)
Article - Conference proceedings
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23 May 1997