As the SCC viscosity can be adjusted depending on the application, the yield stress must remain significantly lower than other types of concrete in order to achieve self-consolidation.
The concept was proposed by Professor Hajime Okamura of Kochi University of Technology, Japan, in 1986 as a solution to the growing durability concerns of the Japanese government.
However, the performance criterion remains the only objective means to evaluate the adequacy of an SCC mix.
Since criterion relates to measurements, test procedures need to be developed.
They are of tremendous help in understanding SCCs behavior.
However, this type of equipment is fairly expensive and not easy to use on a job site.