TY - JOUR
T1 - Effects of structural fibers on bonding mechanism changes in interface between GFRP bar and concrete
AU - Kim, B.
AU - Doh, J. H.
AU - Yi, C. K.
AU - Lee, J. Y.
PY - 2013/2
Y1 - 2013/2
N2 - In this study a total of 63 cubic specimens were prepared to investigate the pullout behaviors of the sand-coated and helically-wrapped GFRP bars as well as steel bars in concretes reinforced with structural fibers (steel, PP and PVA fibers). The results of direct pull-out testing were presented and analyzed with the aim of elucidating the effect of surface treatment of bar, fiber type, and fiber volume fraction in interface and suggesting the effective evaluation method for the improved ductility. The structural fibers in the interface changed the interfacial bond behaviors before and after the maximum stress and resulted in significant improvement of the relative bond strength, but bond failure modes largely depended on the interfacial property with the rebar. The fiber's crack closing resistance, determined by evaluating both the residual bond strength and toughness indices, was used to determine optimum amount and type of fibers in the composites. The closing pressures due to PVA and hook end steel fibers had a good effect on resisting and controlling the interfacial crack initiation, growth, and propagation.
AB - In this study a total of 63 cubic specimens were prepared to investigate the pullout behaviors of the sand-coated and helically-wrapped GFRP bars as well as steel bars in concretes reinforced with structural fibers (steel, PP and PVA fibers). The results of direct pull-out testing were presented and analyzed with the aim of elucidating the effect of surface treatment of bar, fiber type, and fiber volume fraction in interface and suggesting the effective evaluation method for the improved ductility. The structural fibers in the interface changed the interfacial bond behaviors before and after the maximum stress and resulted in significant improvement of the relative bond strength, but bond failure modes largely depended on the interfacial property with the rebar. The fiber's crack closing resistance, determined by evaluating both the residual bond strength and toughness indices, was used to determine optimum amount and type of fibers in the composites. The closing pressures due to PVA and hook end steel fibers had a good effect on resisting and controlling the interfacial crack initiation, growth, and propagation.
KW - A. Glass fibers
KW - B. Fiber/matrix bond
KW - C. Debonding
KW - D. Surface treatments
UR - https://www.scopus.com/pages/publications/84869498264
U2 - 10.1016/j.compositesb.2012.09.039
DO - 10.1016/j.compositesb.2012.09.039
M3 - Article
AN - SCOPUS:84869498264
SN - 1359-8368
VL - 45
SP - 768
EP - 779
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
IS - 1
ER -