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Deterioration and maintenance models for concrete decks with chloride-induced deterioration

Liang, Z and Parlikad, AKN (2016) Deterioration and maintenance models for concrete decks with chloride-induced deterioration. In: International Research Conference on Systems Engineering and Management Science, 2016-4-1 to 2016-4-2, Beijing.

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Abstract

The concrete deck is the primary element that needs to be considered for bridge maintenance. Its deterioration is a combined process of abrasion, erosion, restraint to volume changes and corrosion, which can be generally described as a state transition process. At normal condition, the deterioration rate for the concrete deck is slow. However, it may subject to chemical attack. For instance, the de-icing salt may penetrate through cracks and accelerate the deterioration of the reinforcing bars. This phenomenon is referred as chloride-induced deterioration. It manifests as an induced accelerated deterioration. To assess the risk of chloride-induced deterioration on deterioration failure, a deterioration model with both normal deterioration and accelerated deterioration is formulated using continuous-time Markov chain. Phase-type distribution is used to calculate the expected lifetime reduction due to the chloride-induced deterioration. The result shows that the chloride-induced deterioration has a noteworthy effect on the concrete deck lifetime. Fortunately, maintenance activities such as patching and electrochemical realkalization could be used to mitigate the problem and prolong the lifetime of the bridge deck. A condition-based maintenance policy is designed to schedule the visual inspection to evaluate the condition of concrete deck periodically. If the concrete deck undertakes the chloride-induced deterioration, a minor maintenance activity will be utilized to mitigate the problem and restore the deterioration process back to normal. The optimal inspection interval for the concrete deck is calculated to reduce the cost of ownership. The designed deterioration model improves the previous Markovian deterioration model on bridge deck deterioration by modelling the chloride-induced deterioration as an induced accelerated deterioration. It contributes theoretically on improving the previous deterioration model for the concrete deck from a Markovian deterioration model with a single deteriorating path to a continuous-time Markov chain with multiple-dependent deteriorating paths. The designed condition-based maintenance has the capability to mitigate the problem by reducing the deterioration rate back to normal. It has a practical value to further improve the performance of maintenance on the concrete deck.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div E > Manufacturing Systems
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:18
Last Modified: 17 Aug 2017 01:24
DOI: