Achieving good surface characteristics requires thorough consolidation of the fresh concrete and thoroughly filled forms.Fine aggregate content is fixed at 40 percent of the mortar volume.Water-to-powder ratio (by volume) is assumed to be 0.9 to 1.0 depending upon the properties of the powder (which can be cement, pozzolan or powdered stone). Defined by the American Concrete Institute as “concrete which will be permanently exposed to view and which therefore requires special care in selection of the concrete materials, forming, placing and finishing to obtain the desired architectural appearance,” it is showing its face everywhere.Examples of applications are buildings and transportation structures like bridges and highway sound/barrier walls.Self-consolidating concrete (SCC) is highly flowable, nonsegregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation.
In general, SCC is concrete made with conventional concrete materials and, in some cases, with a viscosity-modifying admixture (VMA).
(1) In 1997, a RILEM committee (TC 174) on SCC was founded.
Today, SCC is studied worldwide with papers presented in almost every concrete-related conference.
During his research, Okamura found that the main cause of the poor durability performances of Japanese concrete in structures was the inadequate consolidation of the concrete in the casting operations.
By developing concrete that self-consolidates, he eliminated the main cause for the poor durability performance of their concrete.
By 1988, the concept was developed and ready for the first real-scale tests.