What Is Aerated Concrete?

Aerated concrete is made of siliceous materials (sand, fly ash, silicon-containing tailings, etc.) and calcareous materials (lime, cement) as main raw materials. , Pre-cultivation, cutting, autoclaving, curing and other processes made of lightweight porous silicate products.

Aerated Concrete

Aerated concrete is made of silicon material (sand,

Aerated Concrete,

1 Light weight : The pores are 70% ~ 85%, the bulk density is generally 500 900kg / m3, which is 1/5 of ordinary concrete and 1/4 of clay brick.

Non-load-bearing

Standard number: GB 11968-2006 Standard name:

Aerated concrete production is rich in raw materials, especially using fly ash as a raw material. It can comprehensively utilize industrial waste residues, treat environmental pollution, and not damage arable land, and can also create good social and economic benefits. The ideal wall material has been strongly supported by the national wall reform policy, taxation policy and environmental protection policy for many years, and has broad market development prospects.

Fly ash aerated concrete block typical raw material formula and consumption: fly ash: content ratio 70%; consumption per cubic meter: 350kg; cement: content ratio 13.8%; consumption per cubic meter: 25-30kg; lime: Content ratio 13.8%; Consumption per cubic meter: 140-150kg; Phosphogypsum: Content percentage 2.96%; Consumption per cubic meter: 15kg;

1 Raw material pretreatment equipment Crusher: block materials of aerated concrete, such as quick lime, gypsum, etc., must be crushed to enter the next

Aerated concrete is a new type of wall building material. It is unique in that it is a very lightweight new type of building wall material that is thermally insulated. The technology of aerated concrete began one hundred years ago, and this technology in China started relatively late, a full 40 years behind foreign countries. However, the development of the aerated concrete industry in China is indeed very rapid. Domestic aerated concrete technology has reached the international advanced level.

The biggest advantage of aerated concrete is to save land resources without wasting a lot of arable land, and its raw materials come from a wide range of sources, such as sand, slag, fly ash and coal gangue, etc. are all raw materials for aerated concrete. In addition, the performance characteristics of aerated concrete are very superior, it has very good processability and heat insulation and heat preservation ability, and it is very plastic, can be planed and sawn, and has very good processing characteristics.

According to statistics from authoritative sources, in the past few years, there were more than 300 domestic manufacturers of aerated concrete industry. The production capacity of different manufacturers is not the same. Some have an annual output of 20,000 cubic meters, and a few have an annual output of 300,000 cubic meters. The heat of the aerated concrete industry has slowly developed. According to rough statistics, the number of aerated concrete manufacturers in China is several times as before.

Aerated concrete is widely used. It is mainly used for wall materials in machinery workshops and civil buildings, load-bearing wall materials such as infill walls, floor slabs and roof slabs, as well as non-load-bearing materials and infill walls around the state.

Gradually, aerated concrete has become the leading product in the building materials industry, and the country has banned production of clay solid bricks. Gradually replaced by aerated concrete blocks, autoclaved bricks.

The birth of aerated concrete block equipment promoted economic development and played a role in fueling the flames. Why do you say that, with the development of China's economy and the improvement of people's living standards, real estate is gradually heating up. The development of real estate today can be said to have reached the peak of development, and the purchase price has also peaked. In addition, many small production enterprises have sprung up almost overnight. These current conditions have led to the occupation of a large amount of arable land, which has gradually reduced the area of arable land. Therefore, the state has issued a policy of three orders and five petitions to protect the arable land and prohibit the unauthorized occupation and expansion of land.

The application of aerated concrete blocks has eased the situation, because the raw materials for making aerated concrete blocks are fly ash, lime sand, coal gangue, industrial waste slag, etc. Most of these sources come from thermal power plants and coal refineries. The unusable and unused ones are generally treated as garbage. Before the aerated concrete block equipment was not used, the fly ash discharged from the previous power plant was buried and the value of its use was not valued. The application has greatly improved the economic cycle of waste, and the fly ash previously buried in the ground has been reused. In addition, local governments have introduced encouraging and supporting policies for the aerated concrete industry. The development prospect is very broad.

In order to protect the cultivated land, the state has issued a policy prohibiting the production of clay solid bricks across the country. Some companies that produce and process clay solid bricks have gradually transformed and gradually started to produce new types of wall building materials-fly ash autoclaved bricks and lime sand autoclaved bricks. The cost of these bricks, as well as the quality of the autoclaved bricks, are much better than clay solid bricks. Therefore, aerated concrete blocks and autoclaved bricks have become the development direction of new building materials in the future.

Production technology of aerated concrete block equipment

1.Storage and supply of raw materials for aerated concrete blocks

Raw materials are transported into the factory by automobiles. Fly ash (or sand, stone powder) is concentrated in the raw material yard, and when used, it is transported into the hopper. Bagged cement or bulk cement is stored in the cement storehouse. When used, it is shipped into the hopper. Gypsum and aluminum powder are placed in the gypsum warehouse and aluminum powder warehouse, respectively, and shipped to the production workshop when used.

2. Raw material processing of aerated concrete blocks

Fly ash (or sand, stone powder) is sent to the ball mill by electromagnetic vibration feeder, belt conveyor, and the finely pulverized 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 via an electromagnetic vibration feeder and a belt conveyor for crushing. The crushed lime is sent to the lime storage bin via a bucket elevator, and then sent to a ball mill via a screw conveyor. The screw conveyor and bucket elevator are fed into the powder batching silo.

Gypsum is manually measured at a certain ratio to make a solution of a certain concentration and sent to a storage tank for storage.

The aluminum powder is transported from the aluminum powder storehouse to the production workshop, and it is lifted to the second floor of the ingredients building with an electric hoist and poured into a mixer to add quantitative water, and stir into an aluminum powder suspension.

3.Aeration block ingredients, stirring, pouring

Lime and cement are successively sent to the automatic weighing scale by a screw conveyor under the powder batching bin for cumulative measurement. A screw conveyor under the scale can evenly add the material into the pouring mixer.

Aerated block ingredients, stirring, pouring

Fly ash (or sand, stone powder) and waste slurry are put into the measuring cylinder for measurement. After 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 in the slurry measuring tank, and add aluminum powder suspension 0.5 ~ 1 minute before the material is poured.

4. Initial aeration and cutting of aerated blocks

After pouring, the mold is pushed into the initial rearing room by the conveyor chain for initial gas setting. The room temperature is 50 70 , and the initial rearing time is 1.5-2 hours. After the initial rearrangement, the mold frame and the blank are lifted together with the hanger. Place the cutting board on the bottom of the kettle in advance. Remove the mold frame. The cutting machine performs cross-cutting, longitudinal cutting and bread milling on the green body, and the mold frame is lifted back to the mold carrier for manual cleaning and degreasing, and then suspended on the mold car to form the mold for the next pouring. The body together with the bottom plate of the kettle is hoisted to the kettle truck by a crane to store two layers, there are four supports between the floors, and several kettle cars are grouped into a group.

Aerated block cutting machine

The waste material at the corners of the green body produced during cutting is sent to the waste slurry mixer next to the cutting machine by a screw conveyor, and water is added to make waste slurry, which is used when batching.

5.Aerated block autoclaving and finished products

After the green body is assembled on the parking line in front of the autoclave, open the autoclave autoclave door to exit the autoclave, first use the hoisting machine to pull out the finished autoclave car, and then use the hoisting machine to prepare the autoclave into the autoclave. The kettle is cured. The finished products on the kettle car are hoisted to the finished product warehouse by a bridge crane, and then transported to the finished product yard by a fork-lift truck. The empty kettle car and the kettle floor are hoisted to the return line. After cleaning, they are pulled back to the yard by a hoist. For the next cycle.