Self consolidating concrete russia

• 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.Because conventional concrete is placed using external energy, there is no need for specific rheological characteristics.Sika® Visco Crete®-1250 NT acts by different mechanisms.

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.Sika® Visco Crete®-1250 NT facilitates extreme water reduction, excellent flow properties, optimal cohesion and highest self compaction behaviour.Sika® Visco Crete®-1250 NT is used for the following types of concrete: High water reduction and excellent flowability have a positive influence on the above mentioned applications.This latter model will be used in the following paragraphs because of its simplicity.)Back to the performance-based definition of SCC, the self-consolidation is mainly governed by yield stress, while the viscosity will affect the homogeneity and the ability to flow through reinforcement (Table 2).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.As a matter of fact, the intensity of energy applied in the consolidation process is adjusted to compensate most plastic property variation.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.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.However, the performance criterion remains the only objective means to evaluate the adequacy of an SCC mix.Sika® Visco Crete®-1250 NT is suitable for the production of site mixed as well as ready-mix concrete.Sika® Visco Crete®-1250 NT is used for concrete with extended transportation – or placing time.

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