Stochastic Assessment of Timing and Efficiency of Maintenance for Corroding RC Structures

Reinforced concrete (RC) structures in a chloride environment are exposed to a particularly aggressive form of deterioration. Managing the maintenance and repair of structures subjected to these conditions is an important issue facing asset owners and operators. In the present paper, the criterion for repair is the extent of corrosion induced cracking. Common maintenance criteria and maintenance techniques are described and these are incorporated into a two-dimensional spatial time-dependent reliability model. This allows the number, timing, and extent of maintenance actions to be predicted over the service life of RC structures. The analysis includes the effect of inspection interval, maintenance technique, repair efficiency, and repair threshold. Results are presented for a typical RC bridge deck subject to a corrosive marine environment. It was found that repair efficiency affecting time to corrosion initiation of repaired concrete is more critical to the performance of the repair than the repair efficiency that affected corrosion rate.

[1]  V. Malioka M.H. Faber.  Modeling of the spatial variability for concrete structures , 2004 .

[2]  T. D. G. Canisius,et al.  Concrete patch repairs under propped and unpropped implementation , 2004 .

[3]  Y. Li,et al.  Spatial variability of concrete deterioration and repair strategies , 2004 .

[4]  M K Chryssanthopoulos,et al.  RELIABILITY-BASED INSPECTION PLANNING FOR RC HIGHWAY BRIDGES , 2001 .

[5]  Dimitri V. Val,et al.  Multiple Limit States and Expected Failure Costs for Deteriorating Reinforced Concrete Bridges , 2003 .

[6]  J. de Brito F. Branco.  Concrete bridge management – inspection, assessment and evaluation , 2004 .

[7]  Bruno Sudret,et al.  Stochastic evaluation of the damage length in RC beams submitted to corrosion of reinforcing steel , 2007 .

[8]  A. S. Al-Harthy,et al.  Utility of spatially variable damage performance indicators for improved safety and maintenance decisions of deteriorating infrastructure , 2007 .

[9]  Luca Bertolini,et al.  Corrosion of Steel in Concrete , 2013 .

[10]  Pal Mangat,et al.  Effect of initial curing on chloride diffusion in concrete repair materials , 1999 .

[11]  Mark G. Stewart,et al.  Corrosion-Induced Cracking: Experimental Data and Predictive Models , 2005 .

[12]  Mark G. Stewart,et al.  Spatial time-dependent reliability analysis of corrosion damage and the timing of first repair for RC structures , 2007 .

[13]  Mark G. Stewart,et al.  Spatial variability of pitting corrosion and its influence on structural fragility and reliability of RC beams in flexure , 2004 .

[14]  Mark G. Stewart.  Spatial variability of damage and expected maintenance costsfor deteriorating RC structures , 2006 .

[15]  Muhammed Basheer,et al.  In-situ assessment of corrosion induced damage of the Dickson bridge deck , 1999 .