Multi-Scale Pull-Out Resistance of Steel Reinforcing Bar Embedded in Hybrid Fiber Reinforced Concrete (HYFRC)
[摘要] This paper investigates the pull-out resistance of a steel reinforcing bar embedded in a strain hardening hybrid fiber reinforced concrete that utilizes both polyvinyl alcohol (PVA) microfibers and hooked-end steel macrofibers. Both unconfined and specimens confined with transverse steel spiral reinforcements were investigated. Pull-out tests on rebars embedded in unconfined concrete revealed brittle splitting failure whereas rebars embedded in unconfined HyFRC exhibited ductile frictional pull-out behavior. The high early rebar pull-out resistance in HyFRC is linked to an improved pull-out resistance of the steel macrofibers due to the micro/macrofiber synergy. Steel macrofiber pull-out tests revealed that the PVA microfibers are very effective in enhancing the pull-out resistance of the steel macrofibers which then lead to an overall performance enhancement of the rebar pull-out resistance.
[发布日期] [发布机构] Department of Civil and Environmental Engineering, University of California, Berkeley; CA; 94720, United States^1
[效力级别] [学科分类]
[关键词] Hybrid fiber-reinforced concrete;Performance enhancements;Poly (vinyl alcohol) (PVA);Pullout resistance;Reinforcing bar;Spiral reinforcements;Splitting failure;Transverse steel [时效性]