南海岛礁远离祖国大陆，环境条件恶劣，没有砂石和淡水资源。采用珊瑚碎屑与珊瑚砂作粗细骨料，采用海水拌合与养护方法制备全珊瑚海水混凝土，应用于港口与机场等岛礁工程建设，具有重要科学意义、国防意义和工程价值。本项目充分发挥珊瑚微粉的矿物掺合料效应，采用“珊瑚+珊瑚砂+珊瑚粉+海水”选材路线，借助富浆混凝土理论和高性能混凝土原理，制备强度等级C50以上的高强全珊瑚海水混凝土，并大幅度降低岛外胶凝材料用量。研究珊瑚微粉在水泥—海水水化体系中的微集料效应、减水效应与活性效应和增强作用，以及与其它矿物掺合料的复合叠加效应；研究C50全珊瑚海水混凝土的制备方法与物理力学性能、抗腐蚀与抗离子扩散渗透等耐久性，探索其长期力学性能演变规律与耐久性劣化机理。本项目旨在研究岛礁珊瑚混凝土的高强化与耐久性劣化等基础科学问题，为南海岛礁建设工程提供一种低成本、高耐久的高强珊瑚混凝土配制方法，推动岛礁建筑材料科学的进步。

South China Sea Islands is far away from the Mainland，where is no sand and freshwater resources and the environment is harsh. So there has a scientific significance, a national defense and an engineering value for coral aggregate seawater concrete which is casted by mixing and curing method with coral chippings and coral sand as a coarse aggregate and a fine aggregate, respectively, and which is used for the construction of island-reef project, such as a port or an airport, etc. Materials selection routes of coral, coral sand, coral powder and seawater are used in the present project. The mineral admixtures effect of coral powder will bring into full play. And the rich cemented concrete theory and high performance concrete principle are used. So that a high strength coral aggregate seawater concrete which the strength grade is greater than C50 is made. In this way, the consumption of cementitious materials outside the island will decrease and the cost will be lower. The micro-aggregate effect, water-reducing effect, active effect and enhancement effect of coral powder in the coral powder-seawater hydration system will be investigated, and the compound superposition effect of coral powder with other mineral admixtures will be studied in the present project. Besides, the preparation method, mechanical property, corrosion resistance, ion diffusion resistance, long-term mechanical properties evolution and deterioration mechanism of C50 coral aggregate seawater concrete will be investigated and explored in this project. In sum, the aim of this project is to study the basic science issues of island-reef coral aggregate concrete, such as high strength and durability deterioration, etc, and to provide a preparation method of high strength coral aggregate concrete with lower cost and higher durability for island-reef engineering, in order to promote the development of the building materials science.