ABSTRACT
A test program is currently underway at Washington University to determine the behavior of composite confined concrete. A portion of that work is reported here which includes results for a single concrete mix (f c = 64 Mpa), two types of fiber (carbon and glass), and ratios of fiber volume to concrete volume ranging from 0 to 0.06. Small composite tubes (50mm by 100 mm) were made by filament winding either carbon fibers or glass fibers coated with epoxy resin around a steel mandrel at an angle of approximately 89 degrees with respect to the cylinder axis. The cylinders were filled with concrete, allowed to cure, then tested in uni-axial compression between rigid steel platens. Measurements consisted of load, crosshead displacement, axial strain, and circumferential strain. Axial strain was determined from the average of readings taken from extensometers placed on opposite sides of the cylinder. An extensometer attached to the ends of a device resembling a bicycle chain wrapped around the cylinder was used to determine circumferential strain.
