CORRELATION BETWEEN SINGLE FIBER PULLOUT AND TENSILERESPONSE OF FRC COMPOSITES WITH HIGH STRENGTH STEELFIBERS

摘要

This paper describes the results of experimental tests designed to correlate the pull-outresponse of two types of high strength steel fibers [Hooked and Torex fibers] with the tensileresponse of fiber reinforced cement composites using such fibers. The focus is mostly onHPFRCC or strain-hardening composites in tension and the parameter studied include fibertype. Experimental results reveal that a strong correlation exists between pull-out behaviorand tensile response, especially in terms of the extent of slip before bond decays and thestrain-capacity of the composite prior to localization. While the bond strength is important,the extent of slip prior to bond softening is also most critical. It is concluded that extensiveslip hardening in the fiber pullout behavior leads to high strain capacity composites withmultiple micro-cracks.