DESIGN OF SELF-COMPACTING CONCRETE COMPOSITIONS

Abstract

The creation of self-compacting concrete became possible thanks to the use of superplasticizers and microsilica in concrete technology. But the idea of completely self-compacting concrete was realized by Japanese scientists after creating a new generation of superplasticizers based on polycarboxylate compounds. The mechanism of action of these superplasticizers is based not only on electrostatic repulsion, but also on steric influence. Several methods have been implemented to test the processing of self-compacting concrete compositions and the use of the resulting concrete in construction. The Okamura method for selecting concrete composition is specified. Minimum requirements for basic materials, selection of the maximum filler size, selection of the amount of water and air involved, selection of the water-cement ratio, calculation of the amount of cement, selection of the amount of coarse aggregate, selection of the amount of fine aggregate.