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The photograph shows the apparatus used to measure the penetration depth. The photograph shows an inverted slump cone with the penetration apparatus on top.

Apparatus used in ASTM C1712.                    
Photos: BASF               

ASTM Test Method for Static Segregation Resistance of Self-Consolidating Concrete
Henry G. Russell, Henry G. Russell, Inc.
Self-consolidating concrete (SCC) must have the ability to flow under its own weight, to pass between reinforcing bars or other obstacles without segregation, and not segregate during or after casting. Three ASTM standard test methods were described in HPC Bridge Views Issue No. 50. In 2009, ASTM International published C1712, Standard Test Method for Rapid Assessment of Static Segregation Resistance of Self-Consolidating Concrete Using Penetration Test. The test method is useful during mixture development and prior to concrete placement in the field. The test does not measure static segregation resistance directly, but provides an assessment of whether static segregation is likely to occur in normal weight concrete.

The test apparatus and protocol were developed based on tests with SCC mixtures containing saturated surface dry coarse aggregates ranging in relative density from 2.67 to 2.79 and in nominal size from 3/8 to 1 in. (9.5 to 25 mm).

The test method uses the penetration apparatus and an inverted slump cone shown in the photographs. After filling the slump cone, the hollow cylinder is aligned in the center of the cone and lowered onto the concrete surface. After 30 seconds, the penetration depth, Pd, is measured. Less penetration means a higher degree of static segregation resistance. A non-mandatory appendix provides the following correlation:

Penetration Depth
in.
Penetration Depth
mm
Degree of Static
Segregation Resistance
Pd ≤ 0.4 Pd ≤ 10 Resistant
0.4 < Pd < 1.0 10 < Pd < 25 Moderately resistant
Pd ≥ 1.0 Pd ≥ 25 Not resistant



HPC Bridge Views, Issue 60, Mar/Apr 2010