Self-Compacting Concrete

This paper presents the properties of fresh and hardened self-compacting concrete (SCC) containing supplementary cementitious materials, such as complex sulphoaluminosilicate additive based on the metakaolin and gypsum, fly-ash and limestone microfiller. If sufficient gypsum is present the main hydration products in unclinker part is a thin crystals of ettringite. Ettringite is formed by a topochemical reaction in a closed space at the beginning of the formation of the cement matrix, which ensures the compaction of SCC.

The possibility of obtaining Self-Compacting Concrete with a large amount of supplementary cementitious materials, including fly ash is shown in this article. Research results of rheological properties of fiber reinforced Self-Compacting Concretes with high volume of fly ash and chemical admixtures, which regulate fluidity and viscosity of concrete mixes, are shown. It was established that the replacement of 55, 70 and 85 wt. % of binder with fly ash allows to obtain Self-Compacting Concrete mixes with the consistency class SF2, viscosity T500 = 5 s and the volume of entrained air 0,4 %.