Aditivos para concreto leve | Agentes espumantes de alto desempenho para concreto celular
O agente espumante de concreto é uma mistura de água, ingredientes alcalinos, e surfactantes. Um agente espumante é usado para fazer concreto celular leve, também conhecido como aircrete. This type of concrete is lightweight and very strong. It is characterized by the ability to form tiny bubbles, which help it to stay in place.
The formulation of the foaming agent varies with the desired characteristics. It is important to choose a mixture that is not prone to chemical or physical processes. Além disso, the mix must be compatible with the cement particles to ensure that the air content is encapsulated in a consistent manner.
The chemical composition of the foaming agent includes water, sodium laurerth succinate, lineralkyl benzene sulfonic acid, and alkyl ether sulfate. These chemicals are present in a concentration of not less than 0.04% em peso do cimento.
An amount of 40-45% water-soluble alkylnaphtliylene sulphonate and 20-25% powdered polyvinyl chloride are present in the foaming agent. These compounds balance the water and create a uniform porosity in the foam.
A supplementary cementitious material such as ground granulated blast furnace slag may be added to the foaming agent. This admixture reduces the use of cement and increases the compressive strength of the finished foam.
To produce high-quality foamed concrete, it is necessary to maintain an effective foaming production rate. The rate is determined by the proportion of the foaming agent and the density of the mix. No entanto, it is important to keep in mind that higher proportions of the foaming agent do not increase the desirable properties of the concrete.