Fly-ash High-performance Pre-stressed Concrete Bridge In The Structure Of The Application

Our bridge facilities are flying with the development of the civil engineering technology, many large-scale bridges are built. Following the increasing span, the volume of the structure is changing larger in the base bridge, anchorage, piers, caps, main tower, the main beam zero block. Some massive volume concrete such as piers, caps, main tower, the main beam Zero block, base and anchorage is crack generally. These phenomena have huge damage to the usefulness and durability of bridge. How to use effective measures to avoid the harmful crack because of the temperature differences of the surface and interior in the concrete structure become a very complicated and difficult technique question in the massive volume concrete project.In the meantime, the current research about the temperature control of massive concrete on the bridge hasn't into the system yet.and the concept is rather unclear in the building practice. Especially in the alpine area the study of the temperature control of massive concrete on the bridge lead to crack because of this change has practical guide. We have found the controlling factors and improvement measures and strive to achieve a breakthrough in the theory will obtain great value. It has a useful benefit for the traffic of china concrete structural design, construction and operation in the alpine regions.This paper use the holistic approach, considering the engineering characteristics, environmental conditions, concrete, production, concrete temperature field and stress field calculation and other factors to ensure the bridge doesn't appear harmful crack as the target in the technical study of the temperature control of massive concrete, and use confrontation uniform principles deal with all kinds of contradictions in the construction process. In the base of the preferred raw materials, optimization of concrete mix, using mineral admixtures and superplasticizer technique prepare high-performance concrete in the low heat, crack resistance and antifreeze. In accordance with alpine environmental requirements, concrete performance test data and condition of the project, using large-scale finite element analysis program to calculate the distribution of various parts of concrete temperature and stress field during construction of bridge. Base on the results formulating temperature control standards and measures under the harsh environmental conditions in our alpine areas. This will ensure the bridge not appear harmful temperature crack in the cold areas so as to achieve increased durability and service life of the concrete bridge. Relying on the actual projects these studies and research will achieve good technical results and significant economic benefits in the engineering practice.The article will have many useful help in the design, construction and monitoring of the large volume concrete engineering.