Enviromental Benefits of Light Concrete - AAC ( Green Products )

Environmental benefits of Light Concrete - AAC

The use of AAC has a range of environmental benefits:

Insulation:

Most obviously, the insulation properties of aircrete will reduce the heating costs of buildings constructed with autoclaved aerated concrete, with consequent fuel savings over the lifetime of the building.

Materials:

Lime is one of the principal mix components and requires less energy to produce than Portland cement, which is fired at higher temperatures. Sand requires only milling before use, not heating, and PFA is a by-product from electricity generation. NB: lime may require less energy to manufacture compared with Portland cement but more CO2 is produced per tonne (cement approx. 800-900 kg CO2/tonne compared to lime at 1000 kg CO2 per tonne).

Carbonation:

Less obviously, the cellular structure of aircrete gives it a very high surface area. Over time, much of the material is likely to carbonate, largely offsetting the carbon dioxide produced in the manufacture of the lime and cement due to the calcining of limestone.

SIZING THE PRODUCTS ?

CUTTING MACHINE !

One of part the important machine unit in the process making of AAC ( light concrete) is cutting machine.
This machine fuctions are.
1. Cutting the green sheet with the uniform size
2. Making the size with in the requirment customer ( customer needed)
3. Mass cutting in one process cutting to minimize process
4. Get the stabilities in standard size
5. Less waste in one way cutting process

More info ,pls contact to Frangky

AAC Stock Area

AAC warehouse ; just put the finish product to the open area ( no roofing ).

How To Making Light Concrete - AAC

Aerated autoclaved concrete is manufactured by mixing a silica rich material such as fine ground sand or fly ash, cement, a sulfate source such as gypsum, quicklime, a rising agent and water.

In a first chemical reaction ;

The quicklime reacts with the water to form heat and calcium hydroxide. The calcium hydroxide, in turn, reacts with the water and rising agent to form hydrogen gas which expands the concrete mix to about twice its original volume, or more. Similar to bread rising, the mix expands into a porous mass. After expansion has occurred, the porous mass is cut to a desired size and shape

Second reaction ;

In autoclave to build strength, rigidity and durability with the cement component serving to harden the mass.

More information : please contact to Frangky

AAC Introduction

Autoclaved aerated concrete (AAC) is a popular building material in use all over the
world. It has a 50-year history of successful use in all environments for all types of buildings (Wittmann, 1983, 1992). Two types of AAC are commonly being manufactured. Both use combinations of lime and Portland cement mixed with either ground quartz sand or Class F fly ash. AAC offers a wide array of positive attributes vis à vis concrete block and insulated wood 2 frame construction for residents of North America. However, the final decision to use AAC instead of more conventional building materials will ultimately hinge on the cost of making, transporting and assembling AAC at its point of use. To date, even after intensive lobbying by the AAC industry, the North American consumer has not made the switch.

In fact two of the original German manufacturers have pulled up stakes and gone home.
Environmentally speaking, AAC is less material and energy consumptive than many
construction materials. It is estimated that the total amount of energy consumed during
production (including energy invested in making Portland cement, lime and rising agent) is on the order of 1000 MJ/m3 (Aroni et al., 1993). It achieves this status because some AAC manufacturers already use fly ash and other industrial waste in their formulations coupled with the traditional low energy processing in an autoclave..

The introduction of a cellular structure during initial formation of the AAC allows one to produce 3-4 m3 of AAC from 1 m3 starting materials (Aroni et al., 1993). When making lime-silica AAC, ground quartz flour is mixed with lime. Portland cement and water to make a thin slurry. At the last moment, rising agent is added to the mixture. The mixture is then transferred to a massive steel mold wherein the slurry begins to foam. After 45 minutes or so, the AAC “cake” occupies approximately 3-4 times as much space as it did when it was first poured. It has also developed enough green strength to be demolded, cut with wire saws to a variety of shapes (blocks and/or panels), and placed in autoclave. After treating in autoclave the block or panel is removed and ready for use. Densities are on the order of 400-600 kg/m3 and compressive strengths range from 2 to 5 MPa (Aroni et al, 1993).

More information please contact to Frangky