The slump flow is the average of the two diameters.
The slump flow test allows a comparison of the lateral flow and filling potential of different SCC mixtures.
It is generally employed in the structural parts of buildings and largely used in skyscrapers, bridges, sidewalks, highways and superhighways and dams.
Therefore, concrete quality must accurately be tested for any building realization.
After spreading ceases, two orthogonal diameters of the concrete patty are measured.
It is consisting of 3 cylinders ø 150 x 150 mm high sliding separating plate and baseplate.
Self-consolidating concrete (SCC) must have the ability to flow under its own weight, to pass reinforcing bars or other obstacles without segregation, and not segregate during or after casting.
Among the existing test methods, slump flow test, using the traditional slump cone, is the most common testing method for flowability (or filling ability) and was standardized in September 2005 as ASTM C 1611.
During the test, the final slump flow diameter and T50 (time needed for concrete to reach a spread diameter of 20 in. The U-Box, L-Box, and especially J-ring (ASTM C 1621) tests are used for the evaluation of passing ability.