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Shandong Alin Machinery Co., Ltd
Add.: No. 4, Economic Development Zone, Liaocheng City, Shandong, China
Tel.:0086-15563598500 
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AAC Block Plant Introduction

Aerated concrete block (light block ) is the light and porous building construction material. It’s with advantages of light weight, thermal insulation, fireproof etc. It can be cut to various sides of bricks: 600×200×100, 80×80×180, 240×115×53, 600×200×125 and so on. They are popularly used in high buildings, walls and infrastructure projects.
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AAC Block Plant Introduction

Description:

Aerated concrete block (light block ) is the light and porous building construction material. It’s with advantages of light weight, thermal insulation, fireproof etc. It can be cut to various sides of bricks: 600×200×100, 80×80×180, 240×115×53, 600×200×125 and so on. They are popularly used in high buildings, walls and infrastructure projects.


Common concrete density is usually 1600-2400 kg/m3, but aerated concrete are 500 kg/m3, 600 kg/m3, 700 kg/m3. The AAC block raw material are silicon material ( coal ash, sand, stone dust etc ). After making the raw material to small granules, they can be used directly for mixing with other materials. Mixing calcium material lime, cement, water to a special slop tank, then add the aluminum dust and additives. The aluminum dust and the special slop have a chemical reflect, producing hydrogen to make the concrete slop to expanding or swell, foam. Next, put them into the curing room to steam curing concrete cutting . At last, they will become the light AAC brick , the porous rate is 70-80%.

Light weight aerated concrete density is usually 400-700 kg/m3 ( according the market in produce ), around 1/3 of clay brick and 1/5 of common concrete. The light brick can reduce more weight of the high building and the load of crossbeam of roof and pillars. It with high earthquake resistance and saving materials cost. It has many porous inside, the delivery heating coefficient is 0.9-0.22 w/(mk), equals to 1/4 or 1/5 of clay brick. It is best building materials in the world at present. The raw materials of AAC block are very cheap and save production cost, including coal ash, sand waste, mine material, coal stone, stone dust and other silicon materials.

Capacity: from 50000 cubic meter to 200,000 cubic meters per year.


Equipment: stocking raw materials, mixing, molding, forming, cutting, evaporating and curing, crane cramp, transporting etc.


1. Product weight is according to 600 kg/m3 to control.
2. Annually capacity 50000 M3 to 300,000 M3.
3. Set raw material proportion: cement 6.5%, raw lime 23%, fly ash 68%, gypsum 3%, aluminum paste powder 350g/M3.
4. Water and material rate 0.631
5. One mould green concrete body 2.88 M3
6. Casting slurry cycle time 5-6 minutes, cut cycle time 5 minutes.
7. Casting slurry temperature 38-42 degree
8. Body quiet stop: time is 1.5-2.5 hours, temperature 50-90 degree, after quiet stop body strength is 0.15-0.18 Mpa
9. Steam curing cycle time, come in and out autoclave about 0.5 hour, steam curing cycle time about is 6 hours/ 1.6 Mpa, total 6.5 hours.
10. Capacity: from 50,000 cubic meter to 300,000 cubic meters per year.
11. Cement lime fly ash style aerated block raw material proportion:

Name

Unit

Cement Lime Fly Ash

Flash

%

65-70

Cement

%

6-15

Lime

%

18-25

Gypsum

%

3-5

Aluminum powder paste ( 600kg / m3 )

1/10000

8

Water & material rate

 

0.60-0.65

Casting system

OC

36-40

Aluminum mixing time

S

30-40

12. Cement lime Sand style aerated block raw material proportion

Name

Unit

Cement Lime Sand

Sand

%

55-65

Cement

%

10-20

Lime

%

20-30

Gypsum

%

2-3

Aluminum powder paste(600kg/m3)

1/10000

8

Water & material rate

 

0.65-0.75

Casting system

OC

35-38

Aluminum mixing time

S

30-40

Reference: cement is 42.5 Portland or 42.5 common cement
Aluminum power paste calculate to use according to 600 kg/m3
Remark: the accurate batching rate is adjustable according to the raw material locally.

 

Aerated Autoclaved Concrete Block Production Process

AAC Block Plant Introduction

1. Boiler is used for supply heat and steam for casting and mixing tank, pre-heating room and autoclave. Temperature of slurry inside mixing and casting tank is about 40℃. Temperature inside pre-heating room is about 40℃. Temperature inside autoclave is about 190℃.

2. Aluminum powder is forming agent of AAC blocks. Aluminum paste mixed of aluminum powder and water is filled into mixing and casting tank.

3. Cement is stored inside cement silo. Lime is crushed by Jaw crusher and milled by Raymond mill. Then lime powder is transported to lime silo by bucket elevator. Cement and lime powder are transported to powder weighing tank by screw conveyor. Cement and lime powder is measured in cumulative metering. Then they are filled into mixing and casting mixer.

4. Coal fly ash (or sand, sand should be milled by ball mill to small granules) is mixed with water inside slurry mixer. The slurry is stored in slurry storage tank. Slurry is measured by slurry weighing tank and then filled into mixing and casting tank.Cement, lime powder, aluminum slurry and coal fly ash slurry (or sand slurry) are mixed inside mixing and casting Machine.Then AAC slurry is filled into mould box.

5. Mould box stays 90 to150 minutes inside Pre-steaming room. Then crane turning machine will take AAC green block to cut cart. Cut cart takes green block to lateral and vertical cutting machine to finish cutting.Then crane block Carrier takes plate with AAC green blocks to steaming cart. Steaming cart is driven by winch machine to autoclave for 8 hours steaming. Finished AAC blocks is sent to ground by forklift truck.

6. Steam cart with Plate is pulled back to crane clock carrier by winch machine. Crane block carrier takes plate onto Plate transport system, which transport plate back to crane turning machine, and it combine plate and mould box together. Mould box can be use for next cycle after painted with machine oil.

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