Abstract

This article presents the durability assessment of the concrete structures in the ongoing Hong Kong–Zhuhai–Macao (HZM) sea link project for a design service life of 120 years. During the preliminary study phase, the durability design of concrete structures has been performed by a model-based method with a partial factor scheme for chloride-induced corrosion process. On the basis of the actual design options adopted in the detailed design phase, the durability assessment of concrete structures is performed for the achieved durability and reliability levels. For this purpose, the durability assessment retains the same model for chloride-induced corrosion as in the preliminary design phase, and takes into account the actual design options for concrete elements such as concrete surface coating, epoxy-coated steel bars, and stainless steel bars. The probabilistic approach is adopted for the durability assessment to evaluate the reliability levels for the design life of 120 years. Following the same probabilistic analysis, the maintenance scheme of concrete elements is investigated with specified reliability levels for different maintenance strategies.

DOI

10.5703/1288284315419

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Jul 24th, 12:00 AM Jul 26th, 12:00 AM

Durability Assessment of Concrete Structures in HZM Sea Link Project for Design Life of 120 Years

This article presents the durability assessment of the concrete structures in the ongoing Hong Kong–Zhuhai–Macao (HZM) sea link project for a design service life of 120 years. During the preliminary study phase, the durability design of concrete structures has been performed by a model-based method with a partial factor scheme for chloride-induced corrosion process. On the basis of the actual design options adopted in the detailed design phase, the durability assessment of concrete structures is performed for the achieved durability and reliability levels. For this purpose, the durability assessment retains the same model for chloride-induced corrosion as in the preliminary design phase, and takes into account the actual design options for concrete elements such as concrete surface coating, epoxy-coated steel bars, and stainless steel bars. The probabilistic approach is adopted for the durability assessment to evaluate the reliability levels for the design life of 120 years. Following the same probabilistic analysis, the maintenance scheme of concrete elements is investigated with specified reliability levels for different maintenance strategies.