Slump is the measure of a concrete mixture's workability and consistency. Generally, a higher slump concrete will have a higher water/cement ratio, although higher slumps may be achieved through the addition of superplasticizers in Type F or G admixtures.

The Slump Test
Before pouring any batch of concrete, it should be tested by filling an inverted cone (commonly called an Abrams cone) with concrete, lifting the cone, and measuring the change in height the concrete falls. Low slump mixtures fall just several inches. If the mixtures falls more than half way (aprox. 6") it is generally considered a High slump mixture.
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