Using a foaming agent will help to improve the properties of concrete. Foaming agents are chemical compounds which are added to cement slurry, and are then mixed with water.
A foaming agent can be a natural or synthetic product. Both can be used to produce high quality foamed concrete.
Synthetic foaming agents are often used in bricks, blocks and cellular lightweight concrete. These agents can reduce the surface tension of liquids and allow the formation of high density concrete with less energy. Chemical foaming agents are usually supplied in a powder form.
Chemical foaming agents are usually low molecular weight compounds. They are also used in soils with high clay content. Sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES) are two examples of chemical foaming agents. They are not considered carcinogenic by the US Environmental Protection Agency. However, they were reviewed by the Cosmetic Ingredient Review (CIR) Expert Panel in 2002.
Foaming agents are also used to produce hollow-shaped foamed plastics. They are used for sound insulation and fire protection. They can also be used in blow-molding processes.
Foaming agents are formulated into a solution based on certain concentrations. They are also used to produce high internal pressure in PP tubes. Depending on the mixture, a foam can last for several hours. The foams produced are light in weight and durable.
Foams can also help to improve the performance of soil for shield tunnelling. They also serve as lubricating agents. They can also help to balance earth pressure. This can help to reduce energy usage of shield machines.
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