engleski

Service life prediction of concrete structures in maritime environment – case study: Maslenica Motorway Bridge

The paper provides a brief overview of recently developed fully coupled 3D chemo-hygro-thermo- mechanical model for simulation of chloride induced corrosion, before and after depassivation of steel as well as its consequences on degradation of reinforced concrete structures. Emphasis of this paper is given on the initiation phase of corrosion in order to analyse the influence of crack width and depth on the transport processes in concrete before depassivation of the steel rebar. The application of the model is illustrated on analysis of the reinforced concrete beam exposed to the cracking due to 4 point bending and influence of seawater. The numerical results of chloride content in concrete are compared with the results obtained on the Maslenica Motorway Bridge after 13 years of exposure to maritime conditions. Good agreement of numerical results and data obtained on the bridge is basis to predict remaining service life of the bridge. According to the assumption of the numerical analysis, depassivation of the reinforcement bar in un- cracked concrete is achieved after 100 years of exposure, while threshold chloride concentration on the level of the rebar in cracked concrete is reached within 1 year after crack opening. The service life will be shorter if the cracks in concrete are wider and deeper.

cracks, chlorides, corrosion, 3D chemo-hygro-thermo-mechanical model

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