Study On The Mix Proportion Design Of High Performace Concrete

High performance concrete (High performance concrete, HPC) is a new kind of High technology concrete, is the great increase in ordinary concrete performance on the basis of using modern concrete technology made of concrete. High performance concrete with high durability, high workability, strength and volume stability of concrete and economy. In the process of the development of high performance concrete, concrete users often too much attention to the strength of the concrete, and ignored the elasticity and toughness of concrete. So now use most of the high-performance concrete strength increasing too fast, the intensity is high, at the same time, the elasticity and toughness of high performance concrete. High performance concrete in the event of deformation, deformation resistance is poor, thus reduce the durability of the concrete. This design mainly aims at the perspective of the relationship between strength and toughness of high performance concrete, through the optimization of high performance concrete mix proportion design, under the strength of the concrete requirements in as much as possible to reduce the brittleness of high performance concrete, improve the resistance to deformation ability of concrete.This design by reading lots of literature material, on the basis of summarizing the predecessors’ research on high performance concrete for design of concrete by means of experimental study. By studying the different dosage of fly ash and sand ratio on the strength and durability of high performance concrete and the influence of modulus of elasticity. On the basis of the strength and durability of high performance concrete guarantee, as much as possible to reduce the high performance concrete elastic modulus. Through research can be concluded that the durability of concrete was mixed with fly ash can significantly high. Dosage of fly ash in a certain range (20%-40%) with the increase of dosage of fly ash, the strength of high performance concrete is reduced, but the frost resistance and electric flux durability indexes meet the requirements, such as the elastic modulus of concrete reduce at the same time. Water-binder ratio of high performance concrete impact on the performance of concrete. In a certain range, the smaller the water-binder ratio of high performance concrete, the higher the strength of concrete, at the same time the frost resistance of concrete and durability indexes such as electric flux also has a certain degree of increase, but the elastic modulus of concrete with low water/cement ratio and improve. This design USES40%of the fly ash content,0.33the water cement ratio of concrete, on the basis of guarantee the strength and durability of concrete, reduce the brittleness of concrete for high performance concrete mix proportion project has a certain practical significance.