Study On The Influence Of Different Material On Freeze-thaw Resistance Of Concrete

In cold areas, the lack of concrete anti-freezing is the major reason which leads to the durability destroy, especially under the environment of water-contacted and freezing, so research the concrete material's freeze-thaw resistance is major aspect which solves the question of the durability of concrete. Firstly, laboratory through study on the influence of different Material on mechanical properties and flow ability of cement mortars, decision the best properties of concrete and mineral forms, secondly study concrete workability,Mechanical Properties and frost-resistance capability with different methods(admixture such as fly ash, silicon fume and nano-material ) . The same time experimental Assessment concrete frost-resistance capability used ASTMC 666-97(A).Concluded as follows:with fly-ash will be able to improve the new mix concrete workability, as the material with their active lower than the cement, and early strength of the concrete is often low, more fly-ash attended the early strength of the apparent reduction. With the silicon fume, nano-material can reduce the dust falls to the collapse of the concrete, the same time enhance early strength of the concrete, but the impact is latter on concrete strength. Different material be able to increase the performance of the concrete anti-freezing. Such as fly-ash, silicon fume and nano- material they have different diameter, filling pore,improve density and anti-freezing of the concrete. Silicon fume have largely amorphous SiO₂, with CH reaction become C-S-H coagulation materials, make hydration product size smaller; prevent its development orientation, the orientation of randomness, lead structure densification of concrete, enhancing anti-freezing of the concrete.With that nano-material, such as (SiO₂,Al₂O₃)with cement in the body of the Ca(OH)2 reaction, further improvement in the concrete material with the type of interface between the structure;at the same time, because nano-material have filling effect and pozzolanic effect, largely enhance dense and anti-freezing of the concrete. Different material with different way of the performance impact of concrete, such as rehabilitation (fly-ash, silicon fume and nano- SiO₂;fly-ash, silicon fume and nano- Al₂O₃)will improve the concrete performance of a single, the better of concrete work performance, mechanics and frost-resistance capability.