What are the processes of autoclaved aerated concrete blocks

There are many construction supplies made of autoclaved aerated concrete, the common one is the cement brick, which is the basis of our building. Autoclaved aerated concrete blocks are such a process. So what is autoclaved aerated concrete blocks? What are the processes of autoclaved aerated concrete blocks? In order to let more friends have a comprehensive understanding of this, autoclaved aerated concrete block manufacturers bring you A comprehensive introduction.

What is autoclaved aerated concrete block

Autoclaved aerated concrete blocks are made of calcium materials (such as cement, lime) and siliceous materials (such as sand, fly ash, slag) by adding aluminum powder to make an aeration agent, which is stirred and cast by water. , Porous expansion and pre-curing cutting, and then porous silicate block made by high-pressure steam curing. The weight per unit volume of autoclaved aerated concrete blocks is one-third of clay bricks, thermal insulation performance is 3-4 times that of clay bricks, sound insulation performance is 2 times that of clay bricks, and impermeability is more than double that of clay bricks. , Fire resistance is 6-8 times that of reinforced concrete. The masonry strength of the block is about 80% of the strength of the block itself (30% for red bricks). The construction characteristics of autoclaved aerated concrete blocks are also excellent. It can not only produce various specifications in the factory, but also can be sawed, planed, drilled and nailed like wood. Due to its large size, the construction speed It is also fast and can be used as a filling material for various buildings.

Autoclaved Aerated Concrete Usage

AAC is a highly thermally insulating concrete-based material used for both interior and exterior construction. Besides AAC’s insulating capability, one of its advantages is quick and easy installation, because the material can be routed, sanded, or cut to size on site using standard power tools with carbon steel cutters.

The process of autoclaved aerated concrete block

1. Raw material storage and supply of aerated concrete blocks

Raw materials are transported into the factory by car, and fly ash (or sand, stone powder) is concentrated in the raw material yard, and it is loaded into the hopper when used. Bagged cement or bulk cement is stored in the cement warehouse. When used, it is shipped into the hopper. Chemicals, aluminum powder, etc. are placed in chemical warehouses and aluminum powder warehouses, respectively, and shipped to production workshops when used.

2. Raw material processing of aerated concrete blocks

Fly ash (or sand, stone powder) is sent to the ball mill through the electromagnetic vibrating feeder and belt conveyor, and the ground fly ash (or sand, stone powder) is sent to the slurry tank for storage by the fly ash pump. The lime is sent to the jaw crusher through the electromagnetic vibrating feeder and the belt conveyor for crushing. The crushed lime is sent to the lime storage bin through the bucket elevator, and then sent to the ball mill through the screw conveyor. The screw conveyor and bucket elevator are fed into the powder batching bin. After a certain proportion of chemicals are manually measured, a solution with a certain concentration is made and sent to a storage tank for storage. The aluminum powder is transported from the aluminum powder warehouse to the production workshop, lifted to the second floor of the batching building with an electric hoist, poured into a mixer to add water quantitatively, and stirred into an aluminum powder suspension.

3. Ingredients, mixing and pouring of aerated blocks

Lime and cement are successively sent to the automatic weighing scale for accumulative measurement by the screw conveyor under the powder batching bin. There is a screw conveyor under the scale to evenly add the materials to the pouring mixer. Fly ash (or sand, stone powder) and waste slurry are put into the measuring cylinder for measurement. When the mold is in place after the measurement of various materials, the slurry can be stirred. The slurry should meet the process requirements before pouring (about 45 ℃), if the temperature is not enough, steam heating can be done in the slurry metering tank, and the aluminum powder suspension is added 0.5 to 1 minute before the material is poured.

4. Priming and cutting of aerated blocks

After pouring, the mold is pushed into the initial raising room with a conveyor chain for initial gas evolution. The room temperature is 50 ~ 70 ° C, and the initial raising time is 1.5-2 hours (this process can be eliminated according to the geographically favorable strip cutting machine). Then use a negative pressure spreader to hang the mold frame and the blank together on the cutting table where the bottom plate of the kettle is placed in advance, remove the mold frame, and the cutting machine performs cross-cutting, longitudinal cutting, milling the bread head, and the mold frame is hung. Go back to the mold truck to manually clean and degrease, and then hang on the mold truck to form the mold for the next pouring. The cut green body and the bottom plate of the kettle are hoisted to the top of the kettle with two cranes. There are four layers between the layers. Each brace is composed of several tank cars. The blanks and corner wastes generated during cutting are sent to the waste slurry agitator beside the cutting machine through a screw conveyor, and water is added to make waste slurry, which is used for batching.

5. Autoclaved aerated block and finished product

After the marshalling is completed on the parking line in front of the kettle, the autoclave kettle door to be exited is opened, the finished kettle in the kettle is pulled out with a hoist, and then the kettle for the autoclave is pulled into the autoclave with a hoist Kettle for maintenance. The finished product on the tank car is hoisted to the finished product warehouse with a bridge crane, and then transported to the finished product yard with a fork-lift truck. The empty tank car and the bottom plate of the kettle are hoisted back to the carriage return line. For the next cycle.