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Self consolidating concrete spread test

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.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.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.

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 .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.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.

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However, the performance criterion remains the only objective means to evaluate the adequacy of an SCC mix.

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