The chemical reaction emits gas to form a porous structure inside the produced concrete block. In the process of batching in the production of aerated concrete blocks, the aeration is added to the aluminum powder slurry mixing tank, and after being fully stirred, it is put into the aluminum powder slurry weighing scale. Put together in a pouring mixer, the aluminum powder in the aluminum powder paste can react with alkaline substances in the aerated concrete slurry to release hydrogen, generate air bubbles, and expand the aerated concrete slurry to form a porous structure. Therefore, the general weight of the aerated concrete block produced is 500-700kg / m3, which is equivalent to 1 / 4-1 / 5 of clay bricks and 1/5 of ordinary concrete, which is a lighter type of concrete. Compared with ordinary brick concrete structure, the self-weight is reduced by more than 40%.
In addition, the use of aeration can also make aerated concrete blocks have the following effects.
Sound insulation effect
Because it has a unique porous structure, the internal structure is like bread, with a large number of closed pores evenly distributed, so it has a certain sound absorption ability. A 10mm thick wall can reach 41 dB.
2. Strong earthquake resistance
Aerated concrete blocks have a light capacity, good overall performance, and small inertia due to earthquakes, so they have a certain ability to resist earthquakes.
3. Thermal insulation effect
Due to the large number of air holes and micro holes inside the aerated concrete block, it has good thermal insulation performance. The thermal conductivity is 0.11-0.16W / MK, which is 1 / 4-1 / 5 of clay brick. The thermal insulation effect of a 20cm thick aerated concrete wall is equivalent to a 49cm thick ordinary solid clay brick wall.
4. Impermeability effect
Because the aerated concrete block is composed of many independent small pores, it absorbs water slowly and conducts moisture. The time required for the same volume to absorb water to saturation is 5 times that of clay bricks. When used in the bathroom, tiles can be directly pasted after interface treatment on the wall.