The core of aerated concrete block equipment maintenance is to control the temperature and humidity (slightly different in water immersion maintenance). The higher temperature can directly promote the hydration reaction of cement and active materials. In a certain temperature range, the higher the curing temperature, The strength of the gas concrete block equipment is higher. Curing temperature is a dominant factor and should be strengthened if the preconditions permit. If there is no humidity environment in the brick blank, the moisture will evaporate after the molding, and the surface of the brick will be loosely powdered due to the sudden loss of water. When the molding moisture is high, fine cracks will also occur. The suitable humidity environment will increase the moisture of the body in time.
The higher temperature accelerates the dissolution of the cement particles and the active waste slag particles, strengthens the surface of the alkaline stimulating substance, and promotes the activation of the external stimulating agent. This will also greatly improve the speed and intensity of hydration. Tests have shown that at normal temperature or low temperature, moisture infiltrates and permeates the cement particles weakly, while at higher temperatures, the infiltration and permeation and exudation effects are greatly enhanced. Therefore, the higher temperature can promote the infiltration, permeation and leaching of the cement particles and the active waste slag particles, and indirectly affect their hydration reaction.
In addition, the existence of a large number of pore structures in the brick (the pores formed by the material being brought into the air, the pores formed by the compaction of the aggregate, the capillary pores generated by the evaporation of water, the gel pores between the cement hydrated particles, etc.) After molding, it is easy to lose its inherently limited points, especially when the external environment is dry or windy, the moisture is more easily lost. To control the evaporation of brick moisture, concrete blocks must maintain a certain environmental (conservation) humidity. When the external humidity of the environment is greater than the humidity of the brick, the evaporation of water will no longer occur, and it will be converted into the addition of external moisture to the brick. At the same time, because the evaporative fire is used to disappear in the large humidity, it also prevents the evaporation of pores and increases the compactness of the brick. Because the capillary pores are reduced or disappeared, the external moisture does not enter the brick body along the capillary holes during the use of the burn-free bricks, and the freeze-free resistance to burning is also increased, and the service life is prolonged.
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According to the principle of chemical reaction, the hydrolysis and hydration process of cement accelerates with the increase of manganese degree and decreases with the decrease of temperature. This is the oxygen in the actual production cycle, but not the entire maintenance cycle to maintain a very high temperature, and then to be treated in stages. In the initial stage of curing, the curing temperature should not be too high. The intense heating will not only cause the body to burst due to the excessive temperature difference between the inside and outside of the billet, but also cause the hydration product on the outer surface of the cement particles to harden and form a blocking layer, which prevents the formation. The internal hydration of the cement granules is inherited, thereby reducing the strength of the slab. In the middle of curing, a higher appropriate temperature is required. Generally speaking, the strength growth of the brick is proportional to the temperature. 2. The cause of the wall crack is macroscopically due to hygroscopic expansion, drying shrinkage, and temperature change. Produces a large stress effect. Thereby, the structure is deformed. When the deformation is restrained by some kind, it will generate large stress and even cause cracks. Microscopically, the aerated concrete block equipment is a silicate building material with a highly dispersed porous structure, which has a high internal void ratio, a small internal diameter of the pore structure, and poor moisture and dehumidification. This property makes the traditional plastering mortar easy to crack and hollow.
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