AAC block

1 The concept of Aerated Concrete
Aerated concrete is a lightweight building materials Pupil, which is based on cement, lime, slag, fly ash, sand and made of materials such as gas as raw material, fine, ingredients, pouring, cutting, conservation, such as autoclaves processes. Its gas contains large quantities of uniform products within the small pores, aerated concrete. It has a light, good insulation properties and processability, etc. It promotes the use of China's earliest and most widely used one light wall materials.
2 AAC Procedure:
1. All kinds of raw materials Reserve Wharf → 2. Measuring and Batching → 3. Add water to raw materials and stir the mixture → 4. Mould ready → 5. Casting → 6. Pre-maintain→ 7. Out of Mould → 8. Turnover and cutting → 9. Grouping and sending into the autoclaves →10. Autoclaving in high temperature → 11. Final products out of the autoclave → 12. Test the final products → 13.Packaging → 14. Palletizing and storing →15. Delivery
3 The concept of new techniques of fly ash aerated concrete
Conventional fly ash aerated concrete production, uses original fly ash, lime, gypsum and other raw materials. It doesn't make use of new technology in the status quo such as pre-activation process and formula, process, technical parameters, etc. It has done a corresponding adjustment and improvement. With higher intensity compared to traditional products, its advantages are lower cost, better performance, smaller density. Has a certain nature. Aerated concrete advantages: Aerated Concrete has been able to be rapid growing, mainly because it has many other advantages of wall materials unparalleled. (1)light weight Aerated Concrete is the main characteristics of light weight, to win light. It dry bulk density generally 400-700kg/m3, the equivalent of clay 1 / 3 of ordinary concrete, 1 / 5, and the lightweight aggregate concrete and hollow block, hollow clay brick, compared to products such as lower. (2) excellent thermal insulation of Aerated Concrete has a very low thermal transmittance, which have good insulation properties. It is often the thermal conductivity of 0.09-0.22w / (mk), the brick is only 1/4-1/5, 1/5-1/10 ordinary concrete. Porosity and pore its rate is about 70%, This is its thermal insulation of the main reasons. (3)good processability Aerated concrete without coarse aggregate, has a good processability can be sawing, planing, drilling, nailing. When in the use of processing can be arbitrary. And the bonding material can be bonded properly. Construction to provide favorable conditions. (4) eat a large quantity of ash, spent a high rate of profit Fly ash and other residues of the total volume ratio above 75%. Digestion can be a large number of fly ash, coal gangue, phosphorus gypsum, calcium carbide sludge and other industrial waste and is conducive to environmental pollution.
4 the type of aerated concrete
Aerated concrete product variety can be classifyed into non-load-bearing blocks, bearing blocks, insulation blocks, wall panels and roof five. Among them, the non-load-bearing concrete block production is most widely used, it is generally the size of the density of 500 kg/m3 and 600 kg/m3, mainly to fill in the structure of the wall and wall, rather than bear the load; load-bearing block size density of 700 kg/m3 and 800 kg/m3, in buildings treated with a special structure to bear load; insulation block is generally the size of the density of 300 kg/m3 and 400 kg/m3, mainly used in building insulation, roofing boards and wall panels are reinforced aerated concrete panels, in accordance with different purposes, different from its reinforcement.
5 aerated concrete quality requirements of raw materials
1, fly ash Fly is the core of this product materials, aerated concrete is the main source of Si-Al components. Should be consistent with (JC409-91) standards (see table below)
The above requirements apply to the general quality of fly ash (CaO ≤ 10%).
2, cement
Cement fly ash aerated concrete is a major source of strength. Aerated concrete for the provision of the main calcareous material. Applicable to the production of fly ash aerated concrete cement, primarily to cement variety and choice of two sides of labeling.
3, Lime
Lime fly ash aerated concrete is produced by one of the main raw material. Its main role is to provide an effective and cement with calcium oxide to thermal conditions in the water with the siliceous material of SiO2, Al2O3 role in the production of hydrated silicon Calcium. Therefore, products of lime is the main source of strength.
4, gypsum
Gypsum in the fly ash aerated concrete, the process is made gas regulator. The regulating role of gypsum mainly reflected in the lime slurry digestion and thickening of the slow speed. Gypsum is the main chemical components of CaSO4. At present, the plaster on the market there are three:gypsum, anhydrite and plaster. In addition, the production process in the chemical waste gypsum is also produced. Such as emissions from phosphate fertilizer production. Phosphogypsum, fluorine chemicals, fluorine emissions from the production of gypsum, titanium dioxide production of titanium dioxide from gypsum and so on. These low-cost gypsum can be used to replace natural gypsum, reduce production costs. In addition, the ceramics factory of waste gypsum model can also be selected.
5, the air-entraining agent
Fly ash aerated concrete filling material must be made as a gas to make the concrete have a stoma, in order to form a porous structure of light.
6, stable foam
Gas agent, as the thin bubble wall, the interference in a variety of conditions, sometimes easy to rupture the bubble out, affecting the quality of concrete, there is a need to join the slurry of foam stability. WD-88-based compound stabilizer used mainly for filling of the pouring of concrete slurry, at the same time it also has a certain role in foam stability, foam stability can be used to enhance the role of stable foam.
6 the principal of aerated concrete production equipment
1, raw material pre-treatment equipment
⑴ Crusher: fly ash aerated concrete block materials, such as lime, gypsum, etc., must be broken in order to move on to the next procedure.
⑵ ball: fly ash aerated concrete used in the lime, gypsum grinding must be carried out in order to better respond to.
2, material measurement equipment
Measurement of raw materials is commonly used microcomputer control automatic measurement system.
3, material mixing pouring equipment
Material mixing equipment is pouring mixer, mixing equipment, it is also the slurry casting equipment.
4, cutting machine
Fly ash aerated concrete made in the air after casting to form a green body. Due to the size of a large body, it is necessary to reach the required size and carry out cutting.
5, Autoclaves Kettle
Autoclave is carried out silicate hydration products, access to physical and mechanical properties of the device. It is used in the fly ash aerated concrete production, production and safety is an important aspect of energy use.
6, the boiler
Autoclaves Boilers mainly dependent reactor and pre-heat furnace and other facilities used to provide heat.
7, auxiliary equipment
⑴ mode box, backplane, mold Cart
The composition of these devices with die casting, fly ash aerated concrete is the main molding equipment.
Steam curing
⑵ car, car ferry, spreader
These auxiliary equipment is autoclaved conservation systems must be equipped.
8, the standard block size (unit: mm)
9 Project Services
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