Siporex Aerated Concrete: Development and Benefit

Siporex Aerated Concrete: Development and Benefit

The question of the optimal masonry is of great importance today. Builders have many different materials available that can be used. All have different advantages and disadvantages. Basically, the following building materials are eligible:

  • lightweight concrete with pumice
  • lightweight concrete with expanded clay
  • brickwork
  • limestone
  • Siporex aerated concrete

While bricks have been burned for centuries from clayey clay and in most massive houses to before Recently, the market has developed better materials due to new needs. Siporex aerated concrete is one of these new building materials.


Despite its designation, aerated concrete is not concrete in the sense of the term definition. The material does not receive any aggregates such as gravel or sand. Cement, lime and lime cement mortar serve as the basis for the mineral, highly porous building material. In addition, aerated concrete contains no aggregate such as gravel or sand. The raw material used is instead sand powder.

One of the strengths of aerated concrete is its ability to provide massive monolithic constructions that simultaneously meet high requirements in terms of heat insulation, sound insulation, fire protection and load-bearing capacity. Compared to other building materials, Siporex aerated concrete is lighter but offers the same strength while being particularly environmentally friendly.

In many publications, the building material is also referred to as & quot; gas concrete & quot; This name is not really representative. In the pores is only air, the low density and the strength based on the manufacturing process. For this reason, the term & quot; aerated concrete & quot; reintroduced and standardized in 1990.


The development of steam-hardened building materials began when the 19th century came to an end. At the time, some researchers were planning to use lime-sand mortar to make construction elements and buildings. The hardening of the mortar with bare air took too long, which is why the researchers looked for alternatives.

Zernikow & ldquo; boiled & ldquo; Lime-sand mortar using high-tension water vapor. But this process brought only a low strength. Later, W. Michaelis also developed low-water lime-sand mortar in high-tension water vapor to make water-resistant, hard calcium hydrosilicate. Patent No. 14195 was granted for this process in 1881 and it forms the basis for the production of steam-hardened building materials.

The next step in the development of aerated concrete , as we know it today, is pore formation. For this procedure a patent was granted in 1889 to E. Hoffmann. He uses dilute hydrochloric acid with limestone powder to make his reaction gypsum mortar with air pores. In 1914, a US patent for J.W. Aylsworth and F.A. Dyer: In the reaction of water, lime and metal powder gaseous hydrogen is liberated. The latter puffs the mortar evenly, much as the yeast does with dough.

The breakthrough came a few years later after the end of World War I in Stockholm, Sweden. YES. Eriksson was working on a concept for lightweight construction materials at that time. The breakthrough came with a patent for the production of porous artificial stones: Accordingly, a finely divided mixture of silica and lime is mixed with metal powder and water. During the setting process, the mixture swells and is cured by means of high-tension steam. The Skövde Gasbeton AB aerated concrete represents & quot; Durox & ldquo; after this procedure since 1924 ago

Following the procedure developed by Eriksson, an autoclaved, gas-blown lightweight stone made of quartz powder and Portland cement was developed in Sweden, known today as the Siporex .


Thermal insulation

With Aircrete from Siporex allows building owners not only to live comfortably, but also to save money when heating. Aerated concrete block contains an air content of 80 percent. This ensures excellent thermal insulation properties, which means that further insulation measures are generally not required.

Heat storage capacity

Large component masses can store heat well and slowly release it back into the environment. This has the advantage that the room does not warm up quickly and at the same time cools down slowly. For a pleasant indoor climate these two characteristics are of great importance. Basically, the higher the density of the building material, the better its heat storage capacity . Aerated concrete, depending on the skill class, has a bulk density of 0, kg / dm3. to 0.70 kg / dm3.


Soundproofing increases the higher the weight of a wall. Siporex aerated concrete does not weigh heavily, but it can extract part of the vibration level from surge waves and convert it into heat. According to DIN 4109, this results in a bonus of +2 dB.


Siporex aerated concrete is not flammable belongs to building material class A1, which is due to its mineral composition. According to DIN 4102, there is currently no higher category. An approximately 75 mm thick aerated concrete wall can withstand fire exposure for 90 minutes and therefore meets the requirements of F-90 according to DIN 4102.


The use of Siporex aerated concrete gives DIYers the opportunity to build quickly, cheaply and with high quality complete. The material is easy to machine and the Planes have a low weight. Inside, thanks to the high dimensional accuracy of the tiles, even walls are created. These need only be plastered with a thin layer plaster. Flow can even be laid directly in a thin bed process.


As mentioned before, Siporex AAC is an ecological building material. The share of raw materials used in the production of aerated concrete is relatively low: One cubic meter of starting material is used to produce five square meters of aerated concrete. For the production relatively little energy and no polluting by-products is needed. As soon as it has to be dismantled, do-it-yourselfers have to shred and dispose of waste. The waste is added to the re-production of Siporex aerated concrete or processed into other materials such as floor slabs, oil binders, sanitary bedding or floor vents.

Artikelbild: © Igor Stramyk / Shutterstock