Foam concrete

Aerated concrete (description)

To get started find out what exactly is foam concrete, than he is good and what are the main differences of foam produced at the facilities provided on our site.

Foam concrete as a building material was invented in Russia and offered for use in the 20's of last century. Obtained by mixing it with special technology of cement, sand and ash, foam and water


Scope of foam is much wider than many other building materials. Foam concrete can be obtained as in the factory, and in the conditions of the site, since the porous structure of cement - sand penomassy fully formed in a short period of time under conditions of intense dynamic impact with stirring mixer.

By changing the ratio of the components, we obtain different types of foam to be used for:

§ exterior walls,

§ internal partitions,

§ termovkladyshey,

§ thermal insulation of roofs,

§ thermal insulation of pipelines,

§ sound insulation intercommunication floors.

The following types of foam:

u insulation - density 400 - 500 kg/m3

u heat-insulating structural - density 600 - 900 kg/m3

u structural - density 1000 - 1200 kg/m3.

Technological process of aerated concrete is as follows: in the bunker supply of raw materials are fed cement and sand in the foam generator is preparing foam using a combination of water and a foaming agent, and then cement and sand comes into barosmesitel, where mixing of the mixture and flow to the place of stacking foam.

The principal differences between technologies offered on our site, from well-known foreign and domestic manufacturers:

stirring the mixture is carried out in barosmesitele under excessive pressure, which allows to keep the structure of the material and transport it by means of compressed air rubber hose to the site of application;

technology includes two basic operations: partial porizatsiyu raw mix and final in its porizatsiyu barosmesitele under excessive pressure;

material has closed pores, which significantly improves the performance of water absorption and frost;

the synthetic domestic foaming agents, which are significantly cheaper than their foreign counterparts and do not run deficits.

Plus to this - all the certified equipment, the technology adopted by the State Commission of the Russian Federation Ministry of Construction, and many products are protected by copyright certificates and patents, there are no foreign analogs, and the authors he was awarded the Russian Government.

Equipment performance to 8 m3/hr.

Density foam is manufactured 400-1200 kg/m3. The possibility of rapid readjustment of the production of foam insulation to structural changes by the ratio of raw materials (binder and filler).




Flow sheet of foam



We present some data on the foam, is manufactured at our facilities UMPB, PBS 0,2.

Physico-mechanical properties of the foam

Wed tight.

in a dry status.,

lb / ft ?


The composition of the dry mixture,%


Average strength, MPa


Consumption

foamer

PB2000 in liters. / m ?

foam

PC 500
Sand
Rszh.
Rizg.

D0




400
100
-
0,6
0,6
0,74

500
100
-
1,6
0,8
0,86


70
30
1,3
0,7
0,8

600
100
-
2,4
1,1
0,64


70
30
1,7
0,8
0,587

700
100
-
3,1
1,3
0,7


70
30
2,5
1,2
0,65


60
40
1,8
1
0,61

800
70
30
3,5
1,5
0,51


60
40
2,7
1,36
0,48


50
50
2,3
1,2
0,45

900
70
30
4,5
1,7
0,53


60
40
3,5
1,4
0,5076


50
50
3
1,3
0,5

1000
70
30
5,8
1,9
0,44


60
40
4,7
1,7
0,43


50
50
4
1,5
0,42

1100
70
30
7,8
2,2
0,4


60
40
6,5
2
0,396


50
50
6
1,8
0,387

1200
60
40
10,5
2,3
0,33


50
50
9,2
2
0,325




Concrete grade at an average density of the dry
400
500
600
700
800
900
1000

The limits of deviation of the average density of concrete in the dry state, kg/m3
351-450
451-550
551-650
651-750
751-850
851-950
951-1050

Coefficient of thermal conductivity of concrete in the dry state, W / (m * K)
0,10
0,12
0,14
0,18
0,21
0,24
0,29

The class of concrete on the compressive strength
0,5

0,75
0,75

In 1

In 1,5
In 1

In 1,5

In 2
In 1,5

In 2

In 2,5
In 2

In 2,5

3,5

At 5
In 2,5

3,5

At 5

7,5
At 5

7,5

In 10

Average compressive strength (at a coefficient of variation of Vp = 17%), however, MPa
0,7

1,1
1,1

1,4

2,2
1,4

2,2

2,9
2,2

2,9

3,6
2,9

3,6

5,0

7,2
3,6

5,0

7,2

10,7
7,2

10,7

14,3


Designed penobetonnye products allow 2-3 times lower cost houses during the construction by developers themselves.

The use of cellular concrete in construction can significantly increase the resistance to heat residential buildings and thus reduce the consumption of expensive energy sources aimed at providing a warm shelter.

As a binder in the porous concrete can be used: portland cement grades 400 and 500, astringent low water, lime, lime - cement binder and others may use gipsotsementnoputstsolanovyh binders, slag Portland cement, lime - slag binder and others. As the fine aggregate can be used quartz sand and ash carryover.

Table of raw materials at one volume setting PBS 0.2 to 200 liters, and some physical and mechanical characteristics of the foam.




Interesting fact. A single-layer structure made of porous concrete medium density 700 kg/m3 can have a thickness of 39 cm for comparison, double-layered wall of ? brick (or heavy concrete) and insulating concrete density 350 kg/m3 - 37 - 38 cm, however, technology is a multilayer structure substantially complicated, and labor costs higher than the single layer of porous concrete.

To summarize. Non-autoclaved aerated concrete hardening is widespread in all regions of Russia. This was facilitated by the simplicity of technology, the use of local raw materials (sand, screenings of crushing, fly ash and other industrial wastes), the availability of components for production. Products made of foam have a number of properties to ensure their effective use in construction:

high thermal and acoustic properties (0,1 - 0,38 W / m * K);

material is lightweight, has acceptable mechanical properties and a wide range of application (density is 400 - 1200 kg/m3, the mass of 1 m3 of 70 - 900 kg, the limit of the compressive strength of 1 - 10.5 MPa, frost is not less than 35 cycles);

high fire resistance (fire resistance of at least 120 min);

longevity (at least 20 years of age) and ecological safety;

economy, relatively low cost (specific energy consumption for the production of foam is 20 times lower than clay bricks 4 kilowatt-hour for 1000 pcs. conv. bricks.; cubic meter of foam to 2-2,5 times cheaper than masonry, plus savings on space heating) .


Foam concrete - a warm, easy and cheap building material of the XXI century!