The Friction And Other Perperties Test And Analysis Of Doped Nano-SiO₂ Concrete

Concrete has used in the civil engineering for more than 150 yrs. During this time a large number of reinforced concrete structure fair to meet the supposed design life. The main reasons comes from the poor durability of concrete structure, the increase of the followed-up load, the less carrying capacity of the whole structure a lower level of standards of structural safety. The engineering practical experience have proved that there must be higher standards for concrete in a special structure and environment. The choice of appropriate mixed agent is one of many important ways to improve the perperties of concrete. Nowadays, with the continuous development of nanotechnology and nano-materials in the concrete and other cement-based material application, the incorporation in concrete with the well-performanced Nano-SiO2 will be a new attempt.In this paper, we have done a lot of experimental study and analysis about the water demand of doped-Nano-SiO2 cement paste, the antiflex strength, compressive strength, Micro-friction property of doped Nano-SiO2 cement-determination, and the wear resistance of doped Nano-SiO2 concrete.The results of study shows that:(1)The incorporation of Nano-SiO2 to cement paste can resulted in the significantly increase of water-demand. When the incorporation of Nano-SiO2 incorporation is about 2%, the water demand will be increased by 30%.(2)The incorporation of Nano-SiO2 will increase the early antiflex and compressive strength of cement-Determination. But the latter part of evidence is not significant, The experiment have proved that with the appropriate amount of content, the early strength can be increased by 20%.(3) The micro-friction test of cement glue sand also shows there are the functions of increase the density of the cement glue sand, porosity reduction and lower friction coefficient by incorporation of Nano-SiO2.(4) The wear resistance experiments of Doped Nano-SiO2 cements shows that the incorporation of Nano-SiO2 also can improve the wear resistance and with the appropriate amount, the wear resistance of concrete can increase by 50% over comman concrete.