Self consolidating concrete testing
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.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.An SCC mixture is generally considered to be acceptable if the percent segregation is less than 10% (ACI 237R-07).
The flow rate is determined by measuring the time it takes for the outer edge of the concrete to reach a diameter of 20 in. The flow rate is influenced by the concrete's viscosity.
The stability can be observed by visually examining the concrete patty for evidence of segregation. The test method is suitable for use in the laboratory and in the field.
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.
Combining values from the two systems may result in non-conformance with the standard.
1.3 The text of this standard references notes and footnotes that provide explanatory material.
There are several organizations that collect the work in this area.
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.
Because of the material performance in its fresh state, the existing testing methods for conventional concrete are no longer suitable for SCC.
Numerous efforts have been explored for new testing methods on SCC in the past decade.