Based on the corrected carbonation depth prediction model, this study develops a time-dependent structural reliability model to predict the probability of serviceability failure subject to carbonation-induced corrosion, using the latest time-dependent CO 2 concentration data. Probabilistic methods are used significant uncertainty and variability of CO 2 emissions, deterioration mechanisms, material properties, dimensions, and environments exist. The time-dependent structural reliability analysis will predict the probability of serviceability failure and cracking risks under various durability design specifications and crack widths considering several IPCC future atmospheric CO 2 emission scenarios. Probabilistic life-cycle costs are developed to compare the economic performance of various durability design specifications and crack widths. An increase in design cover for concrete carbonation corrosion is presented. For cover = 40 mm and water cement ratio = 0.45 , the risk of cracking is 0.003, and the effect of corrosion is neglected. For cover = 20 mm and water cement ratio = 0.55 , the risk of cracking is 0.18 after 50 years, and then increases to 0.37 over the next 100 years. Life-cycle cost for poor durability specification is 3.1 times greater than that for medium durability specification. If the existing design cover is lower than or equal to 55 mm, an increase in design cover of 3 mm to 15 mm is needed to mitigate corrosion damage due to concrete carbonation.


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    Title :

    Cracking Risks, Durability, and Life-cycle Costs for RC Bridges Subject to Carbonation-induced Corrosion


    Contributors:


    Publication date :

    2012-08-15


    Size :

    92012-01-01 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English