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Slump test and compacting factor tests are the most widely used workability tests for concrete. The degree of workability of concrete depends on the values of test results obtained from slump test and compacting factor tests.

Concrete Slump Test

There are many types of concrete construction, and each type has different workability requirements. Following tables shows the degree of concrete workability based on the results of slump tests and compacting factor tests. The range of results of each these tests indicates the suitable uses of concrete work.

The slump and compacting factor test values shown below are of concretes with 20mm or 40mm maximum size of aggregates.

 

Degree of workability

Slump (mm)

Compacting factor

Use for which concrete is suitable

Small apparatus

Large apparatus

Very low

0.78

0.80

Roads vibrated by power-operated machines. At the more workable end of this group, concrete may be compacted in certain cases with hand-operated machines.

Low

25 – 75

0.85

0.87

Roads vibrated by hand-operated machines. At the more workable end of this group, concrete may be manually compacted in roads using aggregate of rounded or irregular shape. Mass concrete foundations without vibration or lightly reinforced sections with vibration.

Medium

50-100

0.92

0.935

At the less workable end of this group, manually compacted flat slabs using crushed aggregates. Normal reinforced concrete manually compacted and heavily reinforced sections with vibration.

High

100-150

0.95

0.96

For sections with congested reinforcement. Not normally suitable for vibration, for pumping and tremle placing.

Very high

Flow table test is more suitable.

Read More:

Various Tests for Workability of Concrete at Construction Site and Recommended Values

What Is Workability of Concrete? Workability vs. Strength of Concrete

Concrete Slump Test – Procedure and Results

Factors Affecting Workability of Concrete

Vee-Bee Test to Determine Concrete Workability using Consistometer

Gopal Mishra

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8 Comments

  1. What should be the slump for sloping roof type RC Slab construction?

  2. Strenght will remain same after final setting time but for sampling purpose you better take the starting point…

  3. Slab casting is in progress by pump, want to fill cube mould. Two set of sample is taken i.e. one at the starting point of pump where TM is releasing the concrete in the hopper of pump and another at the point where concrete is pumped at the slab. Can you tell me whether the strength will differ for both the samples or will be the same. Also tell me which point is recomended for taking sample.

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