海洋工程混凝土长期面临氯盐侵蚀，混凝土中结合氯离子的形成会减缓氯离子的传输进而延缓钢筋锈蚀的发生。而完整混凝土体系中不同物相氯离子结合能力难以评估，且物相氯离子结合行为与氯离子传输交互作用尚不明晰，从而限制了混凝土结构服役寿命预测的准确性。本课题基于热力学理论，拟利用碳化作用下物相含量及降解速率的差异，提出获取物相氯离子结合能力的新方法，准确评估混凝土中相关物相实际氯离子结合能力，揭示不同胶凝体系下物相结合氯离子规律，探明氯离子结合行为与传输之间的交互作用机制，建立氯盐侵蚀条件下耦合多种物相氯离子结合行为的氯离子扩散模型，为海洋工程中混凝土耐久性的精确评估及混凝土结构服役寿命的准确预测提供重要依据。

Concrete structures are confronted with the predicament of long-term chloride attack in marine environments, whilst the forming of bound chlorides in concrete tends to slow down chloride penetration, which leads to the delayed occurrence of steel corrosion. However, the chloride binding capacity of different phases in concrete system is difficult to evaluate, and the interaction between chloride binding behavior and chloride transport is not clear yet, which hinders the accuracy prediction of service life of concrete structures. Hereby, the main objective of this project is to propose a novel method to determine the chloride binding capacity of different phases using the discrepancy of phase contents and their varying degradation rates under carbonation based on thermodynamics theory. Then, the novel will be applied to assess the chloride binding capacity of relevant phases accurately and reveal the chloride binding law of phases in different gelling systems. Further, the interaction mechanisms between chloride binding and transport behavior can be illustrated and a chloride diffusion model coupling the chloride binding behavior of various phases under chloride attack condition will also established. Ultimately, this project is supposed to be able to provide a solid foundation for accurate assessment of concrete durability in marine engineering and precise prediction of service life of concrete structures.