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Some people may say that concrete that self-consolidates on its own weight without the use of vibration has been used for years in the construction field.
But at that time fluidity was obtained by adding water, superplasticizer, or a combination of both.
In addition, that earlier type of concrete was not used in civil engineering structures with normal durability requirements because they either contained too much water or were not stable and led to unacceptable heterogeneity in the structure.
Reduction of the coarse aggregate content in order to reduce the friction, or the frequency of collisions between them, increasing the overall concrete fluidity; Increasing the paste content to further increase fluidity; Managing the paste viscosity to reduce the risk of aggregate blocking when the concrete flows through obstacles.
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.
The cone is filled in one layer without rodding and the diameter, instead of the slump of the concrete sample, is measured after the cone has been lifted .By 1988, the concept was developed and ready for the first real-scale tests.The first paper on SCC was presented at the second East-Asia and Pacific Conference on Structural Engineering and Construction (EASEC-2) in 1989, followed by another presentation at an Energy Diversification Research Laboratories (CANMET)/American Concrete Institute (ACI) meeting in 1992.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.