Description
Autoclaved lightweight concrete (AAC) was invented and produced for the first time in the 1920s by Dr. Johan Alex Erickson, an assistant professor at the Stockholm Institute of Technology in Sweden. The motive behind its production was to protect forests and obtain materials with the properties of wood, such as lightness, thermal insulation, the ability to cut and shape, and on the other hand, without the disadvantages of wood, such as flammability, decay, destruction by termites, etc.After that, in 1945, on the way to the development of this product, German innovators discovered how to cut it, and with the achievement of this technology, mass production began until it was approved and approved by the German standard (DIN) in 1958. Since 1960, due to the cost-effectiveness of construction with these materials, German scientists thought of strengthening them, and in the process of this progress, in 1977, these materials in male and female form with precise cuts minimized the problems of construction.
Since 1987, with the production of large pieces of this product, a revolution has occurred in the construction time and the construction time has been greatly reduced, and since 1994, with new researches, the strength and lightness of this product has reached perfection.
Today, this product is produced with different methods and different brand names in many countries. Products that are produced and sold under different brand names have differences in the mixing ratios of raw materials, the method of cutting concrete, and the stages of the production process. have each other
Teplex production process
Consumable raw materials
AAC lightweight concrete structure consists of the following raw materials:
1- Silica 2- Cement 3- Lime 4- Gypsum stone 5- Aluminum powder
Description of the production process
1- Grinding silica and gypsum together with water and preparing the mixing slurry, lime cement and slurry according to the specific formula in the mixer with a certain period of time.
2- Mixing cement, lime and mortar according to a specific formula in a mixer for a certain period of time
3- Adding aluminum powder to produce green cake
4- Molding the cake and transferring the mold to the processing hall
5- After reducing the moisture to a sufficient level, the cake is transferred to the cutting line and cut to desired sizes by means of special wires. After this step, the cake is ready for the baking process.
The green cake prepared for processing under certain pressure and temperature is first arranged and automatically loaded into the autoclave, and when the autoclave door is closed, the cooking process is started by the software system.
The time and cycle of AAC concrete processing in the autoclave can be briefly divided into four parts:
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1- time before applying steam and pressure 2- gradual application of steam and pressure, controlled increase 3- application of constant pressure and steam 4- gradual reduction of pressure
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6- The production line of Tablex company has 8 autoclave devices with a diameter of 95.2 meters and a length of 70.43 meters. These devices have the ability to bake 1555 cubic meters of AAC concrete per day.
At the end of the process, the green cake has turned into an almost white cake, which indicates the completion of the baking process
7- The white cake taken out of the autoclave is transferred to the packaging line by the robot, and after striping, it is packed with a plastic cover by the packaging machine.
To produce reinforced wall or ceiling panels, the reinforcements that are prepared in advance and coated with special and anti-rust glue are placed in the molds and then the grout is poured into the mold and around the reinforcements. After the grout is filled and rises in the mold, The resulting cake is also cut into desired shapes
The difference between the types of AAC concretes in specific weight and other properties due to changes in the ratio of ingredients and chemical compounds desired in their production is the production of special blocks in various other forms, such as having palates and tongues or blocks with a very smooth surface, etc. It is available to the equipment of Tablex company
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