Application Of High Performance Concrete In The Coastal Highway

With the development of civil engineering construction, the application of high performance concrete is becoming more and more on the infrastructure such as roads,Bridges.The performance of high performance concrete is considered by the world as the most comprehensive. Such as the strength of high performance concrete is higher than ordinary concrete strength, and it has good work performances, and its volume stability and durability are more superior than those of normal concrete.The paper take the Qinhuangdao section of Cheng-Qin highway as the research object, the concrete research pile foundation, pier, pile cap, cap, precast beam,cast-in-place beam structure, concrete grade relates to C30, C40, C50, the total volume of about 200000 cubic metre The main contents of this paper:(1)Discusses the difference of structurethe and component of the high performance concrete and normal concrete,and according to the various factors of actual environmental engineering and the influence of the durability of concrete structure, determine the raw materials of high performance concrete in the project;(2)Study on the high performance concrete mix ratio design method and optimization method. According to the quality of raw materials, concrete strength grade, durability design requirements on working performance of concrete mix design and field adjustment;(3)Maintenance is an important factor affecting the performance of high performance concrete, this paper studies the effects of curing principle and different curing conditions on the strength of concrete. Because of this engineering structure is located in coastal areas, cl- ion pair high performance concrete permeability to do research and measured data;(4)Summarized the construction technology of high performance concrete,Including the construction preparation, metering, mixing, transportation, pouring,curing temperature, tamping, etc., and points out the difference of high performance concrete and common concrete in construction time of each working procedure.After the completion of construction, according to the dataobtained: the high performance concrete work well, the strength and durability index is success;Through the research of the data, the early stage strength of high performance concrete grows rapidly, and the later grows slowly.The strength of the key stage of development is in curing ages 7 d; With the reduction of water cement ratio, the compactness of concrete structure becomes better, and the permeability of Cl–becomes better.