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kelly ball test
- This 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 test
- Slump 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:
Top diameter : 10 cm
Height : 30 cm
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