Title:
Models for Corrosion-Induced Bond Strength Degradation in Reinforced Concrete
Author(s):
Kapilesh Bhargava, A. K. Ghosh, Yasuhiro Mori, and S. Ramanujam
Publication:
Materials Journal
Volume:
104
Issue:
6
Appears on pages(s):
594-603
Keywords:
adhesion; bond strength; corrosion; corrosion pressure; flexural tests; friction coefficient; pullout tests; reinforced concrete
DOI:
10.14359/18963
Date:
11/1/2007
Abstract:
The assessment of progressive degradation of bond between concrete and reinforcing steel is of great importance in evaluating the residual strength of the reinforced concrete (RC) structural members with corroded reinforcements. Simple empirical and analytical models are proposed to demonstrate the effect of reinforcement corrosion on the reduction of bond strength. The empirical models are proposed by considering a wide range of published experimental investigations related to the bond strength degradation as a result of reinforcement corrosion. An analytical model for bond strength of corroded reinforcement has been adopted in which the estimation of various bond strength parameters is proposed by the authors. These parameters include corrosion pressure due to expansive action of corrosion products, modeling of tensile behavior of cracked concrete, and adhesion and friction coefficient between the corroded bar and cracked concrete. The performance of the proposed empirical and analytical bond strength models is then investigated through their ability to reproduce the available experimental trends. It has been found that the proposed models are capable of providing the estimates of predicted bond strength of corroded reinforcement that are in reasonably good agreement with the experimentally observed values and are also in agreement with those of the other reported published data on analytical and empirical predictions.