Correlating dynamic segregation of self-consolidating concrete to the slump-flow test

The three key characteristics of self-consolidating concrete are flowability, segregation resistance and passing ability. Quality control of flowability is typically predicted by the final diameter (DF) of the slump-flow test. In this study, the time required to reach the final diameter (TF) of the slump-flow test is correlated to dynamic segregation for mixes with a constant DF and aggregate-to-binder ratio. Segregation was determined by measuring the radial aggregate distribution from the slump-flow test. It was demonstrated that increasing the TF improved dynamic segregation resistance. It was also found that the TF was more indicative of viscosity than the time to reach a diameter of 50 cm (T50).

► We correlate results from the slump-flow test including final diameter, time to 50 cm and time to final diameter to dynamic segregation.
► Segregation was determined by measuring the radial aggregate distribution.
► At constant aggregate content and final diameter, increasing time to final diameter improved segregation resistance.
► Time to final diameter was more indicative of viscosity than time to 50 cm.