Slump test measures the workability and consistency of fresh concrete by determining the vertical settlement of a standardized concrete sample after being cast in a mold and removed. An ideal slump for concrete is 4-6 inches according to the document. The test must be performed within 2.5 minutes of obtaining the sample and removing the mold within 3-7 seconds for accuracy per ASTM standards.

1. Slump test

2. Pearce can provide concrete in various slump
ranges, depending on strength and workability
needs. Ideal slump is in the 4-6" range. The
slump test must be performed within 2 1/2
minutes after obtaining the composite sample.

3. Slump test
Each layer is rodded 25 times to
Technician begins to fill mold in
settle the concrete, before the next
three equal layers.
layer is added.

4. Slump test
Full mold is ready to be Technician must pull mold off within 3-7
pulled off to measure slump. seconds for accurate test, per ASTM
standards.

5. Slump test
Partial mix being revealed by Full concrete mix now
removal of mold. ready for measurement.

6. Slump test
This mix shows an ideal slump of around 4.5" measured to the
displaced center of the top surface of concrete.