What is the difference between or gas concrete and foam concrete - a comparison of the advantages and disadvantages

By Admin | Construction Materials
11 April 2016

Before you build a house, you have to decide what does it build.It is the chosen material determines how strong will and a comfortable home.Good walls and the heat does not give the street and the noise will not allow outsiders to enter the room.And they should be environmentally friendly and fireproof.Now at the peak of popularity of lightweight and durable material for cellular walls.Often the developer for a long time pondering what to buy: aerated concrete or foam - what is the difference between them.At first glance, and it is not at all.But let's take a closer look closely.

Foam concrete or aerated concrete, what is the difference and what to choose


  1. understand the terminology
  2. Features production of foam blocks and gazoblokov
  3. compare the characteristics of foam and aerated concrete

understand the terminology

cellular concretecalled cement based materials such as lightweight.Their feature is the presence of numerous cel

ls, so the material gets a lot of useful properties - both physical and mechanical.Aerated concrete has several varieties.In addition to the above-mentioned foam and aerated concrete, there is, for example, and ash concrete.Aerated concrete can be autoclave and non-autoclave.

According to the method of formation of these cells secrete materials such as:

  • Aerated;
  • Foam;
  • Gazopenobeton.

By way of solidifying porous concretes are divided into:

  • autoclave method involves hardening of the material at elevated pressure in a sealed container in which the addition of saturated water vapor.
  • neavtoklavnogo method assumes that the material hardens in the natural environment.Thus it is warmed by electricity.It is also possible the processing of the concrete saturated with water vapor.But, unlike the previous method, the pressure is not increased.

Foam concrete and aerated quite significantly different from each other.Their structure and different, and characteristics.In operation, both materials show themselves very differently.

Features production of foam blocks and gazoblokov

1. To make foam, mixed cement base with special additives.They are necessary for the foaming mass.These foaming agents can be both synthetic substances and organic.Foam mass falls into a special form, which hardens and in the natural environment.The result is a foam concrete blocks.A material called monolithic pour not form, and the formwork.After solidification of removable formwork dismantled.Fixed timbering remains in place.

foam structure.

2. There is a significant difference between foam concrete and aerated concrete, manufactured by autoclave method.Last, unlike the foam can be produced only in a production environment.For it to foam, it does not need special chemical additives.Aerated concrete is made from natural materials - water, cement, lime and gypsum.Also, it adds a certain amount of aluminum - in the form of powder or paste.It is this substance contributes to gassing.

Make aerated in a special container - autoclave.In order to give the material strength, it is subjected to high pressure and temperature, as well as water vapor.In the manufacturing process, a chemical reaction between the components, and formed material with new properties.And its crystal lattice similar to the lattice of certain organic substances.This, for example, calcium silicates, such as tobermorite.The chemical reaction is accompanied by evolution of hydrogen - that this gas makes the material porous and fills these same pores.

aerated structure.

When aerated concrete hardens completely, it is time to cut it into neat identical blocks.For this purpose, the strings that provide near perfect clean cut.Due to this when laying the blocks of aerated concrete joints got very thin.So cold bridges through which could go on the street a lot of heat is avoided.

Video Production and differences of aerated foam

compare the characteristics of foam and aerated concrete

guests for manufacturing and that, and other materials are the same.Do not deviate from them.It would seem that both the characteristics of porous concrete must be the same.In fact, there are differences.

water absorption and frost resistance

Difference manufacturing techniques affect these two parameters.So, concrete absorbs water like a sponge.Because of this, during the frost, he manifests itself not in the best way.At the much lower water absorption foam.But we should remember that generally the wall of cellular materials is not left "as is" - they are covered with a protective layer.This can be stucco, siding or tile cladding.So, in practice, can not account for differences in the water absorption.But you can know that aerated concrete plays here.

Video: Aerated sinks or swims

that lasting

both density porous concrete can vary from 300 to 1200 kilograms per cubic meter.If a comparison of aerated concrete and foam of the same density, it would appear that the latter is less reliable and strong.Further, the strength of the material depends on the quality of blowing agents.Since a good foaming agent has a high price, some producers cheat and replace it with a cheaper.Durability unstable foam and the entire surface of the block.But aerated concrete block is homogeneous and equally manifests itself at all points.

Environmental Safety

During production of autoclaved aerated concrete reaction occurs between lime and aluminum.Released from the hydrogen is not the entire output during the solidification of the material.Part of this gas (though very few) can go out and during construction, and then, when the walls of the house have already folded.But hydrogen is not a poisonous gas, so toxic effects on the human body does not produce it.Forming foam blowing agents, as protein, and artificial, also do not contain harmful substances.In addition, the foam pores have closed and sealed.It turns out both of these materials have significant shortcomings in environmental terms, and this option may not be the determining factor in choosing a material.

Video: Is it true that aerated concrete is toxic and banned in Europe

What material is more susceptible to shrinkage

The wall of concrete blocks laid out, there may be a crack.After shrinkage in the material is from 1 to 3 mm / m.Aerated concrete blocks hardly crack because they have similar parameter - not more than 0.5 mm / m.

ability to retain heat

The more dense a structure of cellular concrete, the worse its insulating ability.Therefore foam having a low density - the best thermal insulator than aerated.But bearing walls do not lay it - is not strong enough.Therefore it is necessary to use thicker material, but the wall is thicker, because of its higher thermal conductivity.For example, the walls of the house to Novosibirsk from aerated concrete blocks D600 should not be thinner than 65 centimeters.Then the house will be warm enough.

If under the same conditions to put the walls of aerated concrete, they will receive no thicker than 45 or 50 centimeters.And while the density is sufficient D 400 and D 500. As you can see, aerated concrete is much better able to retain heat, and the wall of it turns lighter and stronger.However, concrete or foam used for your home, you decide.

Fire resistance

Both materials exhibit a well-behaved in this regard.And these cellular concrete good pass the air, and are composed of only a naturally occurring substance.They are lightweight and easy to operate.As for the resistance to frost, then aerated in this respect reliable doubled and sometimes tripled.


Foam cost is significantly cheaper - about 20 percent After the components for its production are not very expensive, and the equipment is not complicated.But building it may take longer than the aerated concrete.So do not look only at the price of a cubic meter of material - first the entire project future home miscalculated.

It is also important that the aerated mixture is laid on the adhesive and foam blocks for inexpensive grout is well suited.However, with the glue laying it is faster and it need far less than cementitious mixtures.The result is that the cost of packing foam blocks (including all materials) exceeds the cost of laying gazoblokov.Furthermore, the thin adhesive layer, unlike cement prevents cold bridges.The result is a more energy efficient home.

Compare sizes

Since the aerated concrete blocks are manufactured in the factory, their sizes are more stable than the foam blocks.After all, you can make foam directly on the construction site - with special facilities.As a result, consumption of materials and styling, and comfort of the clutches of both different cellular concrete.But this is not to say that the aerated concrete - a winner on all counts.

hope that the comparison of the advantages and disadvantages of foam or aerated concrete was timely and help you.Good luck in the construction!

Video: Which is better?Aerated concrete and foam concrete?

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