Of concrete resist freeze sex is to point to concrete to be in use condition to be subjected to after many times freeze thaw cycle, do not destroy, intensity also does not decrease obviously performance.
The influence of water-cement ratio on the frost resistance of concrete is as follows: First, the water-cement ratio is too large, and the sinking rate of aggregate with different particle sizes is different in the vibrating process, resulting in the stratification of slurry and aggregate, more cement slurry floats on the surface, poor wear resistance, and the surface erosion of concrete is easy to be formed when it is damaged by freeze-thaw. Therefore, in the high cold area, especially in the freezing environment with water contact, the water-cement ratio of concrete should be appropriately reduced to improve the freezing resistance. Secondly, the size and spacing of concrete bubbles decrease with the decrease of water-cement ratio, and increase with the increase of water-cement ratio. In the case of similar air displacement, the larger the water-cement ratio is, the larger the space between bubbles is, and the worse the frost resistance of concrete is. Finally, with the increase of water-cement ratio, the total volume and aperture of the internal holes of concrete are getting larger and larger, and the ice swelling pressure and osmotic pressure generated in the freezing and thawing process are large, and the frost resistance of concrete is inevitably reduced.
