Research of foam formers and concrete on their basis for production of products of non-autoclave hardening and monolithic concrete

Abstract

Production of foam concrete products and monolithic concreting from them requires foaming agents that have the properties of the obtained foam with a sufficient value of its criteria (multiplicity of foaming, stability of foam for a certain period of time); its compatibility with Portland cement and its hydration products; with hydrated lime, etc. Insufficient properties of the foam can be compensated by the introduction of corrective and stabilizing additives. Although the studied foaming agents are not always environmentally friendly products, but their low concentration in foam concrete creates a precedent for their indispensability in the production process. The investigated foaming agents practically do not differ in multiplicity and stability at their use in 1% solution. The best technological properties are inherent in the foam obtained from the foaming agent of the PEAS brand. The introduction of the additive partially increases the multiplicity and stability of the foam. In addition, it acts as an accelerator of the set of strength on the hardening of foam concrete, which increases the reversibility of metal molds and accelerates the load of the monolith. It was found that foam concrete compositions that do not contain additives are mainly prone to delamination and shrinkage, so in the manufacture of samples from them, much attention was paid to the quality of the obtained samples. This indicates that the additive is not only a foam stabilizer, it also stabilizes the foam concrete mixtures obtained on their basis.