WHAT IS AAC?
The AAC production process includes raw material preparation, batching and mixing, pouring, precuring, cutting, autoclaving, and packing. With decades of experience in serving the AAC blocks production machinery industry, we can supply customers with quality AAC block production lines with capacity ranging from 80,000m3 to 400,000m3 per year.
Chart 1 the parameter of the processes
| Processes |
Parameter |
| Mixing period |
5-6 minutes |
| Pouring slurry temperature |
40-45ºC |
| Cake curing time |
2.5-3.0h |
| Cake curing temperature |
45~55ºC |
| Cake strength after curing |
0.15~0.18MPa |
| Autoclaved curing system Before-after autoclave |
0.5h |
| Vacuumize |
0.5h(0~-0.06MPa) |
| Listing pressure |
1.5h(-0.06~1.3MPa) |
| Constant pressure |
8h(1.3MPa) |
| Releasing pressure |
1.5h(1.3~0MPa) |
| total |
12h |
RAW MATERIALS
Siliceous materials : Sand / Fly ash / Tailings containing silicon / Ceramic waste
Calcareous material: Lime block + cement + gypsum
Others: Aluminum powder paste
THE ADVANTAGES OF AAC:
1. Low density : Can be 325kg /m3
2. Good thermal insulating properties
3. Cost few time to build, saving time
4. Easy to operate , saving labor cost
5. Good performance of preventing fire
6. Good sound-insulation properties
7. Durable , anti-seismic , recyclable
CUTTING SYSTEM
Special cutting design : All the steel wire columns are fixed on two main oblique beams of cutting machine and each pair of the columns is used to fix only one steel wire , so that the horizontal cutting machine can avoid the settlement cracks problem in thin block and panel cutting , and achieve the minimum horizontal cutting thickness of 50mm block out of a whole mould. The integral swing frame of the vertical cutting machine can ensure the side plate replacement , the cutting action can be synchronized with ferry replacement. With automatic detection system . the broken wire can be timely detected.
PACKING SYSTEM
Automatic packing system can realize the automatic rotation stacking and splicing of blocks and realize the packing function with pallet or non-pallet. The stacking specification can realize 1.2m×0.6m\ 1.2m×1m\ 1.2m×12m\ 1m×0.6m multiple stacking , and the height of the stacking can be 1.2m, 1.5m , 1.8m and 2.4m.
AAC FINAL PRODUCTS
1. Product classification
Product classification is according to national standards GB/T 11968-2006 AAC block, also can be according to user's requirements to produce product with special specifications size.
Chart 2 Specification & Index
| Name |
AAC block |
| Weight |
300~600 Kg/m3(control led by formula) |
| After autoclave compressive strength |
average value≥3.5MPa, Min. value<=2.8Mpa |
| Drying shrinkage value |
Measured under condition of rapid method≤0.8mm/m;Measured under condition of standard method≤0.5mm/m |
| Frost-resistance |
After the cycle of freezing and thawing for 15 times,weight loss≤ 5%,strength loss≤ 20% |
| Coefficient of thermal conductivity |
≤0.14~0.16W/m.k |
2. The block is classified by compressive strength and volume density.
Strength level: A1.0, A2.0, A2.5, A3.5, A5.0, A7.5, A10.
Dry density level: B03, B04, B05, B06, B07, B08.
3. Block level
The block is divided into high-class(A), first-class(B), qualified product (C) according to the size variation, appearance quality, dry density, compression strength & frost-resistance.
4. AAC Block indicator
Chart 3 Size variation& appearance
| Project |
Indicator |
High-class
(A) |
Qualified product
(B) |
Permissible variation of dimension
mm |
Length |
L |
±3 |
±4 |
| Width |
B |
±1 |
±2 |
| Height |
H |
±1 |
±2 |
| Missing angle |
The min. size not more than /mm |
0 |
30 |
| The max. size not more than /mm |
0 |
70 |
| Missing angle no. larger than the above size, not more than |
0 |
2 |
| Crack length |
The crack length through one edge and two surfaces not more than crack directional size sum on crack surface |
0 |
1/3 |
| The crack length of any surface can not be larger than crack directional size |
0 |
1/2 |
| The cracks larger than the above size, not more than |
0 |
30 |
| The depth of cracking, sticking, damage can not be more than/mm |
0 |
1030 |
| Plain bending |
Not allowed |
| Surface porosity, lamination crack |
Not allowed |
| Surface oil |
Not allowed |
Chart 4 Cubic compression strength for block
| Strength level |
Cubic compression strength (MPa) |
| Average not less than |
Single group min. not less than |
| A1.0 |
1.0 |
0.8 |
| A2.0 |
2.0 |
1.6 |
| A2.5 |
2.5 |
2.0 |
| A3.5 |
3.5 |
2.8 |
| A5.0 |
5 |
4.0 |
| A7.5 |
7.5 |
6.0 |
| A10.0 |
10 |
8.0 |
Chart 5 Dry density for block(kg/m3)
| Dry density level |
B03 |
B04 |
B05 |
B06 |
B07 |
B08 |
| Dry density |
High-class (A)≤ |
300 |
400 |
500 |
600 |
700 |
800 |
| Qualified product (B)≤ |
325 |
425 |
525 |
625 |
725 |
825 |
Chart 6 Strength level for block
| Dry density level |
B03 |
B04 |
B05 |
B06 |
B07 |
B08 |
| Strength level |
High-class (A)≤ |
A1.0 |
A2.0 |
A3.5 |
A5.0 |
A7.5 |
A10.0 |
| Qualified product (B)≤ |
A2.5 |
A3.5 |
A5.0 |
A7.5 |
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