1. The surface flour caused by “alkali impurities”
In the formula of fire -resistant pouring materials, the main refractory raw materials, cement and sodium exterior agents, all contain soluble sodium. In low cement refractory castables, the content of alkaline metal impurities is often high. The increase in cement has increased the alkaline of the system, and the hydrophilic minerals generated at the same time are relatively large. A series of reactions occur under the existence of these soluble alkali.
The soluble alkali in the castable material encounters hydrolysis, and the carbon dioxide reaction with the air will produce carbonate. At the same time, the cement hydrates, and the two will continue to react. Continuously decompose calcification.
As long as there is the existence of cement hydrophilic products, the above reactions will be carried out. The product is constantly decomposed, and the pouring body will be damaged by the table and inside.
The existence of soluble alkali in the low cement refractory castable materials increases the solubility of CO2, which is an important prerequisite for response quickly. The larger the systemicity and the more hydrated minerals, the more conducive to the reaction.
2. The environmental temperature and humidity of the maintenance
After pouring, the maintenance temperature is usually 15-20 ° C. Large -scale prefabricated blocks. In order to increase the intensity, it will enter a low -temperature kiln for 30-35 ° C. The intensity and life span, and the phenomenon of powder on the surface of the body is also reduced accordingly. It can be seen that the temperature and humidity of the body’s maintenance environment are a major factor in damage. Generally speaking, the greater the humidity, the easier it is to wet the pores in the pouring body. Under humid conditions, the soluble alkali in the low cement refractory castable materials is easier. The response above 2.1 above is smoother.
3. The impact of the density of the blank body
The density of the blank body is also an important factor that causes the flouring of the low cement refractory castable surface. When the density of the body is low, the pore rate increases, and the carbon dioxide in the air can be easier to spread into the body through the spread, so that damage can be damaged, which will be damaged. The reaction occurs, resulting in the decomposition of the body from the surface and inside.
4. The impact of construction of water
The initial intensity and construction performance of the pouring materials have a lot to do with the amount of water adding water. The construction performance of the water and more water can be better. The reaction is more likely to make the blank surface powder. It is difficult to meet the performance requirements of the construction, so the water increase in construction is also an influencing factor that produces damage.
