Bond capacity of severely corroded bars with corroded stirrups

Abstract

Eccentric pull-out tests were carried out to study the influence of severe corrosion leading to extensive cover cracking, and the effect of corroded and non-corroded stirrups on the anchorage of deformed bars. The specimens ô b average bond stress ô max average bond strength ı rs volume rust/volume steel

Effect of bond degradation due to corrosion – a literature survey

“…Such a bond test could be called as eccentric pull-out test or even beam-end test, as proposed by Chana [6] and also used by Rodriguez et al [7], Almusallam et al [8] and others. Different variants are possible, such as the ones used in Zandi Hanjari et al [9] or Mangat and Elgarf [10]. Moreover, different flexural test procedures, in which the slip at Effect of bond degradation due to corrosion -a literature survey Giuseppe Mancini Francesco Tondolo* the end of the reinforcement of a beam in bending is evaluated (see Al-Sulaimani et al [11]), have been used.…”

“…The experimental campaign reported in Zandi Hanjari et al [9] used specimens with the shape of a beam end after the formation of an inclined shear crack as shown in Fig. 4.…”

Shear behaviour and load capacity of short reinforced concrete beams exposed to chloride environment

“…In contrast, experiments carried out on naturally corroded specimens have shown that bond strength is higher when the corrosion of rebars is non-uniform because of the presence of parts of the bar perimeter that are not affected by corrosion Tahershamsi, Hanjari, Lundgren, and Plos (2014). Moreover, the presence of stirrups, even severely corroded, leads to significant residual bond and anchorage capacity Hanjari, Coronelli, and Lundgren (2011). Although the presence of longitudinal corrosion cracks close to the support will decrease the concrete confinement, the vertical stress on the bar-concrete interface that is generated by a support reaction at the bottom of the beam helps to reduce the crack width and prevent slipping of the steel bar, as concluded by Cairns, Du, and Law (2008).…”

Prediction of the residual load-bearing capacity of naturally corroded beams using the variability of tension behaviour of corroded steel bars

“…a significant bond still exists between corroded bars and concrete (Hanjari, Coronelli, & Lundgren, 2011;Tahershamsi, Hanjari, Lundgren, & Plos, 2014;, plastic deformation only occurred at mid-span during the threepoint bending test. As a result, it was expected that plastic strains affected only a limited area of reinforcing bars at midspan and the 450 mm length pieces retrieved from the tension reinforcement of both corroded and non-corroded beams were not suffer plastic deformation before the tension tests.…”