| Popis: |
Self-compacting concrete is a relatively new material in building industry, able to flow into place under its own weight, filling perfectly the formwork without vibration, avoiding segregation between cement paste and aggregate. The new technology allows to obtain a balance between deformability and stability with similar components of the conventionally vibrated concrete. The use of mineral admixtures provides savings and environmental benefits due to the consumption of by-products. Since its development SCC was widely used in precast industry due to higher powder content necessary to keep the self-compactibility. The use of SCC in situ application remains to be occasionally due to the lack in field research. In this paper are investigated 6 mixtures of SCC with different factorial design w/c ratio, limestone filler content, aggregate skeleton. The fluidity of concrete is attained by adjusted powder content and superplasticiser, no viscosity-modifying admixtures was used. Concrete properties in fresh state are evaluated according to EFNARC, from mechanical characteristic are examined compressive strength on the cube and cylinder specimen at 28 days and tensile strength |
