Autoclaved fly ash bricks and aerated blocks are both lightweight wall materials prepared by using fly ash as the main raw material, but there are some differences in production process, product performance and application scenarios.
First of all, from the perspective of production process, autoclaved fly ash bricks are prepared by stirring, molding, autoclaving curing and other technological processes, while aerated blocks are prepared by batching, stirring, pouring, cutting and other technological processes. In terms of ingredients, the raw materials of autoclaved fly ash bricks are relatively simple, mainly fly ash, lime, gypsum, etc., while the raw materials of aerated blocks are more diverse, including fly ash, lime, gypsum, gas generator, etc. In terms of molding, autoclaved fly ash bricks are formed by pressing, while aerated blocks are formed by pouring. In terms of curing, autoclaved fly ash bricks need to be cured by high pressure, while aerated blocks are cured by natural curing or autoclaved curing.
Secondly, from the perspective of product performance, autoclaved fly ash bricks have high strength, good durability and excellent fire performance, but they are heavier. The aerated block has a lighter weight and better thermal insulation performance, but it has lower strength and poor durability. In addition, the size of the autoclaved fly ash brick is relatively small, generally 240mm 115mm 53mm, while the size of the aerated block is larger, generally 600mm 200mm or 600mm 250mm 200mm.
Finally, from the perspective of application scenarios, autoclaved fly ash bricks are suitable for wall materials of load-bearing walls or non-load-bearing walls, especially in occasions with high strength requirements. Aerated blocks are suitable for infill wall materials for non-load-bearing walls or frame structures, especially where thermal insulation is required. In practical application, autoclaved fly ash bricks and aerated blocks have their own advantages and disadvantages, and should be selected and used according to the specific situation.
In addition, there are some other differences. For example, the production of autoclaved fly ash bricks requires a lot of electricity and heat energy, while the production of aerated blocks does not require additional heat energy. The production of autoclaved fly ash bricks requires large autoclaves and other equipment, while the production of aerated blocks does not require large equipment. The curing time of autoclaved fly ash bricks is longer, while the curing time of aerated blocks is comparatively shorter.
To sum up, although autoclaved fly ash bricks and aerated blocks are lightweight wall materials prepared by using fly ash as the main raw material, there are some differences in production process, product performance and application scenarios. In practical application, autoclaved fly ash bricks or aerated blocks should be selected according to the specific situation. At the same time, in order to promote the sustainable development of wall materials and the requirements of environmental protection and energy saving, R&D and technological innovation should be strengthened to improve the product performance and quality of autoclaved fly ash bricks and aerated blocks.