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What are the key steps in the production process of AAC?

The production process of autoclaved aerated concrete (AAC) includes the following key steps:

Raw material preparation:
Siliceous materials (such as sand, fly ash): dried and ground to achieve appropriate fineness.
Calcite materials (such as cement, lime): weighed and ready for use.
Aerators (such as aluminum powder): finely ground and mixed with other materials.
Other additives: prepared according to the specific formula needs.

Batching and mixing:
Weigh the siliceous materials, calcium materials, aerators and water in a certain proportion.
Put all the raw materials into a mixer and stir to ensure that they are mixed evenly to form a uniform slurry.

Pouring and pre-curing:
Pour the mixed slurry into the mold.
The slurry undergoes a chemical reaction in the mold, produces bubbles, expands in volume, and begins to harden.
During the pre-curing stage, the slurry in the mold is left to stand for a period of time at a certain temperature and humidity to complete the initial curing.

Cutting:
When the slurry reaches a certain hardness, it is demolded from the mold.
Using specialized cutting equipment, the solidified green body is cut into blocks or plates of the required size.
Precise cutting can be performed horizontally, vertically and sideways to ensure dimensional accuracy.
Autoclave curing:
The cut green body is placed in an autoclave for high temperature and high pressure autoclave curing.
In the autoclave, the green body is further hardened under high temperature (about 180-200°C) and high pressure (about 1.2-1.8 MPa).
This process usually lasts for several hours, evaporating the water in the green body and forming the final strength and physical properties.
Finished product processing and storage:
After autoclaving, the finished product is removed from the autoclave.
After quality inspection, qualified finished products are packaged, labeled and stored.
Finally, the finished product is transported to the construction site or sold to customers.

This process ensures that AAC has good physical properties and quality for a variety of construction applications.

What are the advantages of using AAC in modern buildings?

The application of autoclaved aerated concrete (AAC) in modern buildings has many advantages, as follows:

Lightweight:
AAC has a low density, usually between 400-700 kg/m³, which is much lighter than traditional concrete. This greatly reduces the weight of the building, reduces the load on the foundation and structure, and helps to reduce construction costs.

Thermal insulation:
AAC contains a large number of tiny pores inside and has excellent thermal insulation properties. The use of AAC can reduce the energy consumption of buildings, improve energy efficiency, meet the requirements of green buildings, and reduce heating and cooling costs.

Sound insulation:
The porous structure of AAC gives it good sound insulation performance, which can effectively isolate external noise and provide a quiet living and working environment for residents. It is particularly suitable for buildings with high sound insulation requirements, such as residences, schools, hospitals, etc.

Fireproof:
AAC is an inorganic material with good fire resistance. It will not burn at high temperatures and will not produce toxic gases. AAC walls have a high fire resistance limit in fires, can provide longer fire protection, and increase the safety of buildings.

Convenient construction:
AAC is easy to process and can be easily cut, drilled and sawed to meet various architectural design needs. High construction efficiency shortens the construction period and reduces labor costs.

Environmentally friendly and sustainable:
Industrial waste such as fly ash is used in the production process of AAC, which helps to reduce waste emissions. Its production and use process has low energy consumption, which meets the requirements of sustainable development.

High precision:
AAC is precisely cut during production and has high dimensional accuracy, which helps to achieve precise construction, reduce the use of mortar, and reduce waste and costs in construction.

Durability:
AAC has good anti-aging properties, is not easily affected by climate change and environmental pollution, has a long service life, and reduces the frequency of maintenance and replacement.

Versatility:
AAC is suitable for a variety of building components such as internal and external walls, partitions, roofs, floors, etc., with a wide range of applications to meet the needs of different building types.

Combining the above advantages, AAC has become an ideal green building material in modern architecture and is widely used in residential, commercial, industrial and other fields.