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The RILEM technical committee, TC 174-SCC (Self-Compacting Concrete), ASTM Subcommittee C09.47 (Self-Consolidating Concrete), ACI Committee 237 (Self-Consolidating Concrete), and TRB Committee AFN10 (Basic Research and Emerging Technologies Related to Concrete) are good examples.Symposiums and workshops on this topic were given by these organizations and several test methods on the flowability of SCC have been popularized since then.
Hence, the only force left to be determined is the drag force, and it can be solved using the equation of motion shown in Fig. In steady state condition and when Reynolds number (Rn) is less than 0.5, the drag force can be linearly related to the velocity by applying Stoke’s Law for a spherical particle as shown in equation 1: (2.1) where, η is the viscosity of the measured liquid; is the density of the measured liquid.From the equation, it can be noted that the drag force is linearly related to the velocity of the ball and the size of the moving ball.Equation 1 is valid for a spherical particle moving with a constant velocity in a Newtonian fluid.These fresh properties are governed by the rheological properties of the material and some studied have been conducted in the lab to investigate the correlation among the measured parameters from above-mentioned methods (e.g.
correlating T50 and the flow velocity at L-box test to the plastic viscosity).
A good test method that can help to quantitatively determine the viscosity and the yield stress of SCC in the field is urgently needed.