Abstract
This paper performs the durability assessment of concrete structures during construction phase in the ongoing large-scale Hong Kong-Zhuhai-Macau (HZM) project with a service life of 120 years. The background of this project is first introduced and the durability design at preliminary study phase is recalled. Then, the durability model for assessment is established for HZM and the statistical properties of the model parameters are given. From the collected data on the chloride diffusion coefficients and concrete cover thickness, the statistical properties of these parameters are updated. With the design options adopted in design phase and the updated parameter properties, the achieved reliability levels are calculated for structural elements under different exposure conditions for both normal and accidental working cases. On the basis of the achieved reliability level of durability, a preliminary maintenance planning is performed for the RC/PC elements in the concrete structures, and the corresponding recommendations are given.
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