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That is probably why, up until now, a simple slump window requirement was enough, in conjunction with good consolidation practices, to lead to dense concrete elements in most applications.
With SCC, other rheological requirements are needed to obtain good consolidation since no additional placing operations will compensate for any lack of rheological performances.
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.
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.
(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.
Because conventional concrete is placed using external energy, there is no need for specific rheological characteristics.
As a matter of fact, the intensity of energy applied in the consolidation process is adjusted to compensate most plastic property variation.
ASTM Committee C09 on Concrete and Concrete Aggregates undertook this task in June 2001 in its Subcommittee C09.47 on Self-Consolidating Concrete.