Lightweight Concrete Block Making Machine
Lightweight Concrete Block Making Machine
Autoclaved Aerated Concrete (AAC) Panel:
Autoclaved aerated concrete panel is a new type environment-friendly and lightweight building material which is made from silica sand, cement, lime, gypsum and aluminum powder, and added anticorrosive steel mesh according to structure requirement. The autoclaved aerated concrete panel with porous structure is formed through high temperature, high pressure and steaming, it also has excellent performance like fire resistance, anti-earthquake and insulation.
Autoclaved aerated concrete panel is a kind of aerated concrete products, it can take different processes according to the raw material category, quality, characteristic of main equipments, and it is a good structural performance building component which is made according to certain requirements in the process. But in general, the main technological process includes raw materials preparing, steel processing, steel assembling, material batching, pouring, curing, cutting, steaming, out from autoclave and other processes. Autoclaved aerated concrete panel not only has various properties of autoclaved aerated concrete block, but also has high added value of production, which can greatly improve the constructing efficiency, reduce the building comprehensive cost, and has other advantages, so it is highly promoted.
Brief Introduction of AAC Product
Aerated concrete brick is a light and porous building material. It is based on cement, lime, slag, fly ash, and sand and made of materials such as gas as raw material.
It has the features of being light; keeping temperature can’t be burn, good insulation and others.
It can be made into many kinds of sizes e.g. 600×200×100, 600×200×125…
They could be used in industry building and common building. As one of the earliest and most widely used materials, they are more and more popular in the world and they will replace the Clay brick completely.
Advantage of AAC:
1. Lightweight: Porosity achieve 70% to 85%, volume density is generally 500 ~ 900kg/m3, as 1/5 of general concrete the 1/4of clay, the 1/3 of hollow brick, and similar with wood can float in water. It can reduce building weight, reduction in the cost of integrated building.
2. Fireproof: Most of the major raw materials is inorganic materials, so it has good fire resistance, and do not emit harmful gases when meet fire. Fire 650 degrees, as a refractory material, the thick up of 90mm walls can reach to 245 minutes fire resistance, 300mm thick up wall can reach to 520 minutes fire resistance.
3. Sound insulation: Due to a unique porous structure, so it has a sound absorption capacity. The sound absorption capacity can reach of 10mm thick wall up to 41 db.
4. Insulation: As the material inside has a large numbers of the pores and porous, which has a good thermal insulation properties. The Thermal conductivity is 0.11-0.16W/MK, as 1/4-1/5 of brick. Typically, the insulation effect of 20cm thick aerated concrete wall is equivalent to 49cm thick solid brick walls ordinary.
5. Permeability: Result of material by the composition of many independent small pores, the moisture absorption is slow, in the volume of absorbent is 5 times of clay saturation do. When used in the bathroom, the wall can be treated to interface directly paste tiles.
6. Anti-seismic: The same building structure, improve the two seismic than the brick level.
7. Green: Manufacturing, transportation, all use the process of pollution, to protect arable land, saving energy, is one kind of a green building material.
8. Durability: material strength is stability, in the specimens tested after one year of atmospheric exposure; the intensity increased by 25%, and remained stable after ten years.
9. Shortcut: it has good machinability, can be sawed, planed, drilled, nailed, and available appropriate as bonding of adhesive material, so create favorable conditions for building construction.
10. Economies: An integrated lower cost than using more than 5% of solid clay bricks, and can increase the usable area, greatly enhance the utilization of floor space.
Requirements for Raw Materials:
1 | Sand | JC/T622-1996 | ||||||
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| Excellent goods | First-class goods | Qualified goods | ||
SiO2 | silicon dioxide | ≥ | 85% | 75% | 65% | |||
K2O+Na2O | kalia+sodium oxide | ≤ | 1.50% | 3.00% | 5.00% | |||
SO3 | sulfur trioxide | ≤ | 1.00% | 2.00% | ||||
| clay | ≤ | 3.00% | 5.00% | 8.00% | |||
| water ratio | ≤ | 8.00% | |||||
| calcium carbonate | ≤ | 10.00% | |||||
| impurity (bark, grass roots) |
| N/A | |||||
2 | Flyash | JC409-91 | ||||||
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| Excellent goods | First-class goods | Qualified goods | ||
| Finess(0.045mm square screen left) |
| ≤ | 30% | 45% | 55% | ||
| Water requirement of normal consistency |
| ≤ | 50% | 58% | 60% | ||
| loss on ignition |
| ≤ | 7% | 12% | 15% | ||
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| SiO2 | ≥ | 40% | 40% | 40% | ||
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| SO3 | ≥ | 2% | 2% | 2% | ||
3 | Lime | JC/T621-1996 | ||||||
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| Excellent goods | First-class goods | Qualified goods | ||
A(CaO+MgO) | Available calcium | ≥ | 90% | 75% | 0.65 | |||
MgO | magnesia | ≤ | 2% | 5% | 8% | |||
SiO2 | silicon dioxide | ≤ | ||||||
CO2 | carbon dioxide | ≤ | 0.07 | |||||
| degesting speed min | ≤ | 5--15 | |||||
| degesting temperature ℃ | ≥ | 60--90 | |||||
| undigested residue | ≤ | 5% | 10% | 0.15 | |||
Fineness of finished product (remainder above 0.08mm hole screen) |
| ≤ | 10% | 15% | 0.2 | |||
4 | Cement | GB175-1999 | ||||||
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| Chemical composition |
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SiO2 | silicon dioxide |
| 21-23 % |
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Al2O3 | aluminium sesquioxide |
| 5-7 % |
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Fe2O3 | iron sesquioxide |
| 3-5 % |
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CaO | calcium oxide |
| 64-48 % |
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MgO | magnesia |
| 4-5 % |
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5 | Aluminium powder | JC407-2000 | ||||||
| Type | Code | Solids content | activated aluminium | Foaming rate (%) | |||
≥ | ≥ | 4min | 16min | 30min | ||||
Oil-based formulation | GLY-75 | 75% | 90% | 50-80% | 90% | 99% | ||
GLY-65 | 65% | |||||||
Water-based formulation | GLS-70 | 70% | 85% | 40-60% | ||||
GLS-65 | 65% | |||||||
AAC Production Process and Main Equipments:
1. Belt Conveyor | 2. Batching Machine | 3. Roller Screen | 4. Slurry Tank | 5. Wet Ball Mill |
6. Jaw Crusher | 7. Dust Remover | 8. Bucket Elevator | 9. Lime Stone Silo | 10. Dry Ball Mill |
11. Lime Powder Silo | 12. Cement Silo | 13. Screw Conveyor | 14. Slurry Storing Tank | 15. Scale for Slurry |
16. Scale for Lime & Cement | 17. Ferry Cart | 18. Tilting Crane | 19. Cutting Machine | 20. Cutting Machine |
21. Tilting Crane | 22. Steam Cart | 23. Autoclave | 24. Crane after Autoclave | 25. Product Crane |
26. Side Plate Conveyor |
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Application:
AAC brick is applied widely in the world, especially in below conditions and places.
1. 1st Youth Olympics Games in Singapore
2. Pakistan Flood of 2010
3. Russia Fire
4. Hainan province flood in China
5. In the earthquake of Indonesia and New Zealand
6. Infrastructure in Iraq and Afghanistan
7. 16th Asian Games Guangzhou
8. EXPO 2010 Shanghai
9. Infrastructure of America
Service is a part of the product and competition. We have consistently adhered to “take the consumers’ needs as the core service and make consumers satisfied to promote our products and brand” as our service standard, and try our best to carry promise out in the whole service system, so as to realize “make specialty into classic” and “create Shende brand, make customers satisfied”.
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