Self consolidating concrete slump

During the slump flow test, the viscosity of the SCC mixture can be estimated by measuring the time taken for the concrete to reach a spread diameter of 20 inches (500 mm) from the moment the slump cone is lifted up.This is called the T) value may be appropriate for concrete that has to travel long horizontal distances without much obstruction.The VSI is established based on whether bleed water is observed at the leading edge of the spreading concrete, or if aggregates pile at the center.VSI values range from 0 for “highly stable” to 3 for unacceptable stability.5.3 It is difficult to produce self-consolidating concrete that is both flowable and nonsegregating using coarse aggregates larger than 25 mm [1 in.].

Several test procedures have been successfully employed to measure the plastic properties of Self-Consolidating Concrete.The slump flow test, using the traditional slump cone, is the most common field test and is in the process of being standardized by ASTM.The slump cone is completely filled without consolidation, the cone lifted, and the spread of the concrete measured.The slump cone can be either used the same way up or inverted.A sample of freshly mixed concrete is placed in the cone in one lift without tamping or vibration.

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