| Its long coastline of China’s coastal areas, many coastal have a lot of Ocean Engineering，marine engineering and other infrastructure is an important protection of marine resources tothe development and utilization of ocean space. Ocean City construction of deepwater port onthe coastal city’s sustained and rapid economic development will play an important role inboosting the, for example, docks，bridge and so on. And these works was primarilyconstruction of concrete materials.Concrete structure has the advantages of easy process, low energy consumption, widesource of raw materials, simple process, low cost; it is durable, strong adaptability, thereforein the ocean engineering，highway and railway bridges，underground buildings and otherconstruction play an important role and has become one of the most important, indispensableengineering structure maetrials.Concreet is not a once and for all durable materials, concreteworks also has its useful life.In order to ensure the durability of large concrete structures,some of the works to be taken as the core technology of high performance concrete durabilityintegrated technology solutions.However, China’s current large marine engineering long lifein service-related technical speciifcations, high performance concrete design，production,construction technology in engineering applications is still blank, so the actual project to thespeciifc needs of durable concrete structures Bridge strategy and the application of HPCtechnology is extremely urgent and important.Therefore, combined with the speciifc needs ofpractical engineering application, technical strategy of concrete structure durability and highperformance concrete study of sea crossing bridge is extremely urgent and important。This paper mainly relying on the Xiangshan Harbour Bridge Engineering，the cross seabridge foundation position of large dimensions，complex engineering environment is harsh,quantity of concrete pouring, characteristics of long time, carry out research and developmentsystem of concrete core technology system of large volume of marine engineering. Accordingto the project of Xiangshan Harbor Bridge in seawater and the harsh climate, resources andthe environment on the construction site, evaluation of potential rules of concrete deterioration, with large amount of mineral admixture skeleton dense packing theory, theinfluence of mineral admixture on workability, concrete for marine main mechanicalproperties and its development; Preparation of master of high performance marine concrete,the quality evaluation system of construction, to formulate the corresponding constructiontechnology and quality control guidelines. Study on the use of lfy ash and slag, and lfy ash-slag and silica fume three yuan of mixing technology, according to the different content ofadmixtures with orthogonal table concrete ratio design，the ratio was optimized withC15?C55of different strength grade of marine high performance concrete, the effects ofmineral admixture and compatibility on the workability, mechanical properties, concretedurability performance, marine high performance concrete construction quality control andconstruction method, and the experimental research of mineral admixture amount andblending methods on marine concrete anti chloride ion permeability influence regularity.Meanwhile, the marine concrete sulfate resistance and early crack resistance were studied. Onthis basis, the research of mineral admixture on the role of durable concrete mechanism,which provides the theoretical basis of xiangshan island bridge design and to supportconstruction. |
