Nano-silica Fume Composite Powders Ultra High Strength Cement Based Materials Pilot Study

In the past 20 years, the nano-meter structural material has drawn people's interesting more and more. The cement is as a large amount of construction material used at present, Draw lessons from nano-meter material research in the fields of pottery ,etc. and use achievement, use nano-technology go on research of modifying to it, can be expected to improve the micro structure of the cement further, improve its physics mechanics performance and durability. The results show that nano-sio2 is a morphous; its activity is higher than silica fume .The addition of the mixture of nano-sio2 and silica fume powders can improve compactability, uniformity and strength.In this paper the ultra -high-strength cement-based composite were investigated using such materials: ordinary Portland cement (OPC), nano-sio2, silica fume, super plasticizes with commonly used control craft in the project at present, The results of this investigation show that the water/binder ration used is the most significant factor to control the strength of the material, the mixing-amount of nano- sio2 and superplasticizes have certain influence.