Shear performance and behavior of long carbon fiber reinforced concrete
”In this study, a laboratory testing program was developed to investigate the shear performance of fiber reinforced concrete beams. Long carbon fibers, to be included with a traditional fresh concrete mix, were developed and their shear performance was evaluated and compared to the performance and behavior of unreinforced concrete, traditionally reinforced concrete, and fiber reinforced concrete (FRC) with other fiber types. The experimental program consisted of 30 large-scale beams tested for shear performance under monotonic loading. In addition to the large-scale beams, small-scale specimens were constructed of the same materials to correlate large-scale performances to ASTM C1609 testing and to determine if the FRC met the requirements to replace the minimum transverse reinforcement, as required by ACI 318-14. The main parameters investigated were fiber volume fraction, fiber type, and beam depth. Fibers were included at volume fractions between 0.5% and 2.0% for the small-scale testing and 0.5% and 1.0% for the large-scale testing. In addition to the LCFRC specimens tested, specimens including steel fibers and a proprietary, olefin fiber were also tested. The carbon and olefin fibers had an aspect ratio of 32, while the steel fibers had an aspect ratio of 80. The two beam depths tested were 18 in. and 24 in. (457 and 610 mm). All full-scale, fiber reinforced beams exceeded the ACI 318-14 shear capacities for minimum shear reinforcement. Beam depth did not result in any significant change in the performance of the beams. A mechanistic-based model proposed by the research team reasonably predicted the shear performances of the FRC beams”--Abstract, page iv.
Carbon Fiber, Fiber Reinforced Concrete, Shear behavior, Civil Engineering
Missouri University of Science and Technology
Networked Digital Library of Theses and Dissertations