what is slump in concrete

what is slump in concrete

1 year ago 31
Nature

Concrete slump refers to the consistency of fresh concrete before it sets, and it is a measure of the workability or consistency of the concrete mix. The higher the slump, the more fluid the concrete is. The slump test is performed to check the workability of freshly made concrete and to ensure uniformity for different loads of concrete under field conditions. The test is done by filling a cone with a sample of the concrete, removing the cone, and measuring how far the concrete has slumped. The slumped concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as true slump, shear slump, or collapse slump. A true slump is where the top of the concrete mass slumps evenly all the way around, and the bulk of the mass stays in one place. The slump test is used to ensure uniformity for different loads of concrete under field conditions. The concrete slump test is a way of finding out the consistency of different concretes, and it shows the workability of the concrete and the ease with which it can be molded into the desired shape. The benefits of performing a slump test are that it impacts the strength, durability, and appearance of the finished structure. The slump test is limited to concrete formed of aggregates of less than 38 mm (1.5 inches) and is suitable for slumps of medium to low workability, slump in the range of 5 – 260 mm. The test fails to determine the difference in workability in stiff mixes, which have zero slump, or for wet mixes that give a collapse slump.

Read Entire Article