United States Department of Transportation
i
Behavior of Post-Tensioned Polymer-Impregnated Concrete Beams
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1978-06-01
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[PDF-7.52 MB]
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Alternative Title:Polymer Concrete - Highway Application [Project Name]
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Abstract:This study was conducted to investigate the behavior of post-tensioned polymer-impregnated concrete (PIC) beams. Three major areas of behavior were studied by experimental and theoretical analyses: flexure, shear, and time-dependent deflections. Test results were compared to values calculated according to ACI Standard 318-71 and to results from numerical analyses for inclined cracking and ultimate shears, moment capacity, and tendon stress increase. The beams were dried to remove the moisture from the concrete voids, impregnated with the monomer system, and polymerized by thermal-catalytic methods. The tendons were stressed to about 70 percent of the ultimate strength prior to the testing. Nineteen simply-supported beams with I-shaped cross sections were tested using two symmetrically placed concentrated loads. For flexure, the major variables were the prestressing steel percentage, the monomer system, the impregnation depth of PIC, and tendon bonding. For shear, the number of wires per tendon and the amount of web reinforcement were the major variables. Three control beams were tested, one for flexure and two for shear. For time-dependent deflection tests, the number of wires and the magnitude and duration of sustained loads were selected as variables. In all beams, bonded reinforcing bars were used to supplement longitudinal reinforcement to prevent cracking from the drying process.
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