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How does a slump test check strength?


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Answered 2010-11-03 23:06:18

Slump check does not measure strength. It measures workability. Workability is the ease with which concrete can be placed in position.

Correct as far as it goes! Slump refers to workability however it is also, all telling as to the water content of the mix. The more water, the easier it will work! Problem becomes, too much water will increase the porosity making the concrete weak and susceptible to early degradation because contaminates are able to enter and commence corrosion of embedded steel.

A concrete that is easy to work that has a high water content [ more than .40 ] is known for shrinkage cracking due to rapid evaporation of the high water content. These cracks caused by rapid loss of water decrease compressive strength and invite early corrosion. This type of concrete also experiences, curling and ASR as well as efflorescence in a very short time period.

Strength is a function of correct hydration, slow internal curing and careful design of a mix for the intended service criteria and not a whole lot to do with slump!

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The slump test is the most widely used device worldwide. In fact, the test is so well known that often the terms workability and slump are used interchangeably, even though they have different meanings. • Specifications are typically written in terms of slump. • The slump test is simple, rugged, and inexpensive to perform. Results are obtained immediately. • The results of the slump test can be converted to yield stress in fundamental units based on various analytical treatments and experimental studies of the slump test. • Compared to other commonly used concrete tests, such as for air content and compressive strength, the slump test provides acceptable precision.


A shear breaks off or crumbles. A slump stays together however it will slump down.


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The importance of slump test in concrete work is to ensure consistency in the concrete. The test measures the workability of the concrete.


IN Slump Test we have to provide a uniform base and it requires 4 times for compacting the concrete to fill the cone while without disturbing the bottom layer of concrete. but in other it is requred only to compact well to concrete with disturbed to bottom layer.which is good regarding the strength of concrete.


To check the consistency of the concrete; to determine if the concrete flow smoothly into the shape of the formwork. It is a quick check to see if the concrete is suitable for use.


compaction factor test is better than slump test,because compaction factor test should have own compaction wight,so correct value will be find out from compaction factor test.........


The slump test gives fairly good consistent results for a plastic-mix. This test is not sensitive for a stiff-mix. In case of dry-mix, no variation can be detected between mixesof different workability. In the case of rich mixes, the value is often satisfactory, their slump being sensitive to variations in workability.


Slump test is the most commonly used method of measuring workability of concretewhich can be employed either in laboratory or at site of work.It is seen that the slump test gives fairly good consistent results for a plastic-mix. This test is not sensitive for a stiff-mix. In case of dry-mix, no variation can be detected between mixes of different workability. In the case of rich mixes, the value is often satisfactory, their slump being sensitive to variations in workability.


To randomly check the quality of concrete, work ability base on mix design. It must be checked prior casting in place


The difference in level between the height of the mould and that of the highest point of the subsided concrete is measured. This difference in height in mm. is taken as Slump of Concrete.


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The concrete mix should be a 5:1 Cement to water ratio. make sure you mix thoroughly when adding water. Look up "Concrete slump test"


kelly ball testThis is a simple field test consisting of the measurement of the indentation made by15 cm diameter metal hemisphere weighing 13.6 kg. when freely placed on fresh concrete.The test has been devised by Kelly and hence known as Kelly Ball Test. This has not beencovered by Indian Standards Specification. The advantages of this test is that it can beperformed on the concrete placed in site and it is claimed that this test can be performed fasterwith a greater precision than slump test.slump testSlump test is the most commonly used method of measuring consistency of concretewhich can be employed either in laboratory or at site of work. It is not a suitable method forvery wet or very dry concrete. It does not measure all factors contributing to workability, noris it always representative of the placability of the concrete.The appartus for conducting the slump test essentially consists of a metallic mould in theform of a frustum of a cone having the internal dimensions as under:Bottom diameter : 20 cmTop diameter : 10 cmHeight : 30 cm


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Im guessing that you mean field test of concrete and not cement. Typically testing for air content, slump, and temperature are performated as outlined by ACI.


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