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Vibration of self consolidating concrete

Therefore, numerous test methods have been developed for SCC with ease of use in mind.

None of these test methods measures yield stress or viscosity, but they all simulate more or less real-scale casting environments.

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.

But at that time fluidity was obtained by adding water, superplasticizer, or a combination of both.

Most of the work still has to be completed, but with over 40 participants, this team should be able to do it in a timely fashion Several tests have already been developed worldwide to characterize the performance of a fresh self-consolidating concrete.

A few of them are briefly presented in the following paragraphs.

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.

At this time, various mix design methods have been proposed in order to obtain the unique rheological performances of SCC and may lead to different mix designs for a given application.

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ASTM Committee C09 on Concrete and Concrete Aggregates undertook this task in June 2001 in its Subcommittee C09.47 on Self-Consolidating Concrete.