Workability measurement methods
1.Slump test - simplest and crudest test
The apparatus used for doing slump test are Slump cone and Tamping rod.
2. Compacting factor test
Compaction Factor is the ratio of the weight of partially compacted concrete to the weight of the concrete when fully compacted in the same mould. The weight of partially compacted concrete in relation to its fully compacted state is a reasonably good indication of the workability of concrete.
3. Vebe test
The Vebe time test is a more scientific test for workability than the Slump Test, in that it measures the work needed to compact the concrete. The freshly mixed concrete is packed into a similar cone to that used for the slump test. The cone stands within a special container on a platform, which is vibrated at a standard rate, after the cone has been lifted off the concrete. The time taken for the concrete to be compacted is measured. Vebe times range from 1 second for runny concrete to more than 12 seconds for stiff concrete. Unlike the slump test, the Vebe time test gives useful results for stiff concretes.
4. Flow table test
The flow table test or flow test is a method to determine the consistence of fresh concrete
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