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Do you know all kinds of foam concrete

wallpapers Industry 2020-04-16

In traditional foam concrete production, the foaming agent is dissolved and then mechanically foamed by physical methods, and then the foam generated by it is mixed into the slurry composed of the gelling material and the admixture—the concrete material containing micropores obtained after stirring, casting and demoulding curing.

Classification of foam concrete

There are many types of foamed concrete, which are usually classified according to the types of cementitious materials, bulk density, foaming methods, maintenance methods, types of aggregates, production technology, application fields, etc.

(1) Classification according to the type of gelling material

Cement foam concrete: Portland cement, sulfoaluminate cement, etc. are used as the cementing material, and the cementing material is obtained through the hydration reaction of the cement clinker mineral, which is usually used as various foam concrete plates or cast-in-place foam concrete. It is the leading producer of foam concrete.

Magnesite foam concrete: using lightly burned magnesium as the cementing material, magnesium chloride solution as a blending agent, and then through the preparation process of foam concrete, the roof insulation board, partition wallboard, external wall insulation board, etc. are built. Magnesium cement is characterized by good slurry viscosity, easy foam stabilization, and high early strength.

Gypsum foam concrete: using gypsum as cementing material, prepared by the foam concrete preparation process. The disadvantage is its low strength; its advantages are early strength and fast shrinkage and low deformation.

Alkali slag foam concrete: Alkali slag is used as the cementing material, and it is obtained through the foam concrete preparation process. It has the characteristics of high strength in the early and late stages.

(2) Classification according to the difference in bulk density

Thermal insulation foam concrete: mainly used for thermal insulation foam concrete. Usually, it is foam concrete with a bulk density of 400kg / m3 or less. The ultra-light foam concrete made in recent years has the characteristics of high-efficiency thermal insulation.

Load-bearing foam concrete: used as a load-bearing material and at the same time has a certain energy-saving thermal insulation effect. Usually, it is foam concrete with a bulk density of 700g / m3 or more.

Load-bearing and thermal insulation foam concrete: used as self-supporting foam concrete. Usually, it is foam concrete with a bulk density of 500-600 kg / m3.

(3) Classification according to different foaming methods

Physical Foaming Agent Foam Concrete: After foaming with a surfactant-based foaming agent through a foaming machine, it is mixed with a well-mixed slurry, and the density of the foamed concrete is adjusted by changing the number of bubbles added. The foam concrete prepared by this method has good construction performance, but its dependence on the foaming machine is too large.

Inflatable foam concrete: foam concrete prepared by aeration and foam stabilizer. It is made by foaming agent compressed air, releasing bubbles in the slurry. Its raw materials, product performance, production technology, and equipment are the same as aerated concrete; only the formation principle of air bubbles is different, it can be called aerated foam.

Chemical foaming agent foam concrete: using hydrogen peroxide or aluminum powder through a chemical reaction to release gas to produce foam concrete. The temperature of the concrete and the consistency of the slurry will affect the foaming time and the amount of foaming, which can be called post-foaming.

Foamed concrete after mixing: use surfactants, protein-based animal and plant foaming agents, etc. are mixed in the mixer and mixed with the slurry. This is a method of making air bubbles by stirring. The change of the stirring time, stirring speed, aggregate particle size, and other factors can adjust the gas content, and the workability can be achieved only by stirring.

(4) According to different classifications of maintenance methods

Natural curing foam coagulant: The entire curing process is completed through natural curing, and can also be obtained by curing in a plastic greenhouse or a solar panel curing room.

Steam curing foam concrete: made by curing with atmospheric steam.

Autoclave curing foam concrete: obtained by autoclave curing under relatively high steam pressure.

(5) Classification according to different types of aggregate

Polystyrene particle foam coagulator: using polystyrene particles as aggregate, mixed with foam concrete slurry, foamed concrete.

Expanded perlite foamed concrete: foamed concrete prepared using expanded perlite as aggregate. In addition, there are also lightweight aggregate foam concretes prepared with polyurethane particles, phenolic resin particles, vitrified bead particles, and vermiculite.

(6) According to the different classification of the production process

Factory prefabricated foam concrete: refers to the foam concrete prefabricated in a specialized factory, such as foam concrete insulation board, foam concrete block, and foam concrete wall panel.

(7) Classification according to different application fields

Foamed concrete in construction: foamed concrete in various parts of the building such as roof insulation, exterior insulation, and floor insulation.

Garden landscape foam concrete: rockery in gardens, ceramists for gardening, floating objects in the water, basic materials for modeling gardening decorations, etc.

Industrial foam concrete: industrial pipeline insulation, coal furnace insulation, chemical filtration, etc.

Environmental engineering foam concrete: used for sewage treatment, or used to absorb hydrogen peroxide and put into the seawater with red tide, it can play a role in suppressing red tide.


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