Ultra High Toughness Cementitious Composites (UHTCC), featured with its strain hardening characteristic and outstanding crack controlling capacity under tensile conditions, could greatly enhance the durability of reinforced concrete structures and prolong the service life of infrastructures. By means of accel-…
Ultra High Toughness Cementitious Composites (UHTCC), featured with its strain hardening characteristic and outstanding crack controlling capacity under tensile conditions, could greatly enhance the durability of reinforced concrete structures and prolong the service life of infrastructures. By means of accel- erated corrosion test and direct pull-out test, bond behaviors between corroded rebar and UHTCC with differ- ent corrosion ratios (from 0 to 5%) were investigated, did the same for corroded rebar and ordinary concrete while other conditions being the same. The average bond stress-slip relationship with different corrosion ra- tios were presented and simulated with a constitutive curve model, and fitted well. The relationship between maximum average bond stress and corrosion ratio indicated that the maximum average bond stress of rebar and UHTCC increased linearly before corrosion ratio up to 3%, then remained constant till to 5%, while the maximum average bond stress between rebar and concrete decreased rapidly when the corrosion ratio ex- ceeded 2%. The results proved that UHTCC could still restrict the rebar under higher corrosion ratio.