The Engineering Application On The Trans-Oceanic Bridge Construction Of High Performance Marine Concrete

Concrete is indispensable in modern civil engineering, use the largest and most versatile building materials. Ordinary concrete, however, was not as expected, ruled the safety, durability, lack of structural damage caused by the phenomenon of increasing the resulting economic losses can not be overlooked. Therefore, strengthening quality control of concrete structures to meet the safety and durability requirements for the construction priority.With the continuous progress of concrete materials science, people began to study the high work, high durability, good volume stability of concrete, namely, high-performance concrete (HPC). High-performance concrete, not only in performance, greatly improved compared with ordinary concrete, in the conservation of energy resources, improving working conditions, industrial waste utilization, bad Habitat protection also has very important significance.China is in a period of rapid economic growth, and many costly marine engineering structures such as cross-sea bridge, offshore drilling platform has been or will be built, these structures in a harsh marine environment, its long-term security of the normal use to become the focus of the engineering sector. The high-performance concrete in marine engineering high-performance concrete with its performance advantages, you can effectively overcome the use of environmental harm to the building structure, to extend the service life and improve the structural durability purposes.In conclusion, this paper cross-sea bridge project in Qingdao of the scientific and rational basis test to study marine engineering high-performance concrete physical and mechanical properties and durability, and thus for the future of such works in harsh marine environments The long-term use has laid a good foundation, at the same time for similar construction of marine concrete structures play a similar approach.Qingdao Trans—oceanic Bridge is the third trans—coeanic bridge which are constructing in our country. The designing life of durability is 10 years. Aiming at the actual requirement of Practical construction the special study on the high Performance marine concrete (HPMC) about Qingdao Trans—oceanic Bridge is study in this dissertation. The physical appearance and durability of HPMC is study in this dissertation also. It establishes a scientific theory and test foundation for the enginecring construction.The seires of experiments indicate that three types of super plasticizers including CW, Mabei and Sika are perfect. The different grade HPMC fulfilling the request can be got by adjusting the proportion of the multiple mineral additives. The shrinkage of the HPMC added multiple mineral additives will be larger and the proportion of fly ash and blast furnace slag should not be less than 3:1. The time when peak temperature value of HPMC appeared will be suspended 25-30h than standard concrete, and the peak temperature value will be decreased 16 degree. The anti-permeability of HPMC added 40% multiple mineral additives will be increased evidently; and the grade of anti-permeability can get P30.The HPMC has perfect anti-corrosion performance; the anti-corrosion parameter of HPMC can get 0.9. The carbonation speed of HPMC is larger than standard concrete, and the carbonation parameter of the concrete will be lower with the curing times. The life of the construction will be 100 years if the thickness reaches 60cm. The HPMC added 40% multiple mineral additives has strong anti-permeability of chloride. The Da of concrete will be less. The chloride content by weight of concrete will accord with a certain function. The chloride content in C30 standard concrete, C40 standard concrete and C30 HPMC accord with an ExpDecay 1 function, but it will accord with Boltzmann function in C40 HPMC. The total electricity quantity crossing HPMC added 40% multiple mineral within six hours are limited in 100C-1000C. The HPMC can fulfill the permeability requirement of practical engineering construction.In conclusion, this paper cross-sea bridge project in Qingdao of the scientific and rational basis test to study marine engineering high-performance concrete physical and mechanical properties and durability, and thus for the future of such works in harsh marine environments The long-term use has laid a good foundation, at the same time for similar construction of marine concrete structures play a similar approach...