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Keywords: diffusion, concentration of chlorides, concrete, finite element method, Monte Carlo simulation, probability, MPI.

Summary

The reliability of reinforced concrete bridge decks is in many cases governed by durability. Many structures require premature rehabilitation or replacement as a result of environmental deterioration. The durability of concrete bridge decks may be affected by corrosion of reinforcement steel.

The corrosion of reinforcement steel arising from the ingress of chloride salts applied to melt snow and ice is a severe problem. Since the reinforced concrete is a composite material, mild steel is used to provide the required tensile properties and to control surface cracking. When reinforcement corrodes, the formation of rust leads to a loss of bond between the steel and concrete; and subsequent spalling and delamination. It impairs not only the appearance of the bridge deck, but also its strength and safety, arising from the reduction in the cross-sectional area of the reinforcement, as a result of the deterioration of bond with the surrounding concrete. The computations discussed in this paper are limited to the determination of chlorides concentration and do not include the effects of rust formation.

The analogy between heat transfer and diffusion analysis has been utilized for numerical modelling. Three node plane finite elements for thermal analysis have been used. The reliability assessment has been done by a comparison of the actual and limit concentrations of chlorides at given points in the model (near reinforcements positions) after a given time (10 years, 50 years and 100 years).

A probabilistic approach with the Monte Carlo procedure has been used. The relatively long computational times can be successfully shortened by utilization of of parallel processing (parallel supercomputers and the MPI have been utilized here). It can be concluded that the proposed solution is feasible and acceptable. It can be concluded that even a high-end multi-processor workstation (with sixteen or more processor cores) can be used for computations of smaller real-life problems of this type.

The computational approach itself still includes several problems. In is quite problematic to determine the initial concentration of chlorides and concentration changes over time and no other time-dependent changes in concrete are assumed here. It has assumed that concentration is constant during the lifespan of the bridge.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 101 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON PARALLEL, DISTRIBUTED, GRID AND CLOUD COMPUTING FOR ENGINEERING Edited by: Paper 46 Reliability of Reinforced Concrete Bridge Decks with Respect to Ingress of Chlorides J. Brozovsky and P. Konecny Faculty of Civil Engineering, VSB-Technical University of Ostrava, Czech Republic doi:10.4203/ccp.101.46 purchase the full-text of this paper Full Bibliographic Reference for this paper J. Brozovsky, P. Konecny, "Reliability of Reinforced Concrete Bridge Decks with Respect to Ingress of Chlorides", in , (Editors), "Proceedings of the Third International Conference on Parallel, Distributed, Grid and Cloud Computing for Engineering", Civil-Comp Press, Stirlingshire, UK, Paper 46, 2013. doi:10.4203/ccp.101.46 Keywords: diffusion, concentration of chlorides, concrete, finite element method, Monte Carlo simulation, probability, MPI. Summary The reliability of reinforced concrete bridge decks is in many cases governed by durability. Many structures require premature rehabilitation or replacement as a result of environmental deterioration. The durability of concrete bridge decks may be affected by corrosion of reinforcement steel. The corrosion of reinforcement steel arising from the ingress of chloride salts applied to melt snow and ice is a severe problem. Since the reinforced concrete is a composite material, mild steel is used to provide the required tensile properties and to control surface cracking. When reinforcement corrodes, the formation of rust leads to a loss of bond between the steel and concrete; and subsequent spalling and delamination. It impairs not only the appearance of the bridge deck, but also its strength and safety, arising from the reduction in the cross-sectional area of the reinforcement, as a result of the deterioration of bond with the surrounding concrete. The computations discussed in this paper are limited to the determination of chlorides concentration and do not include the effects of rust formation. The analogy between heat transfer and diffusion analysis has been utilized for numerical modelling. Three node plane finite elements for thermal analysis have been used. The reliability assessment has been done by a comparison of the actual and limit concentrations of chlorides at given points in the model (near reinforcements positions) after a given time (10 years, 50 years and 100 years). A probabilistic approach with the Monte Carlo procedure has been used. The relatively long computational times can be successfully shortened by utilization of of parallel processing (parallel supercomputers and the MPI have been utilized here). It can be concluded that the proposed solution is feasible and acceptable. It can be concluded that even a high-end multi-processor workstation (with sixteen or more processor cores) can be used for computations of smaller real-life problems of this type. The computational approach itself still includes several problems. In is quite problematic to determine the initial concentration of chlorides and concentration changes over time and no other time-dependent changes in concrete are assumed here. It has assumed that concentration is constant during the lifespan of the bridge. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £40 +P&P)
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