Question

According to IS 456-2000, what is the slump of a medium degree of workability of concrete if placed in heavily reinforced sections like slabs, beams, walls, columns?
1. 50 - 100 mm
2. 0 - 10 mm
3. 25 - 50 mm
4. 10 - 25 mm

Answer 1

Correct Answer - Option 1 : 50 - 100 mm

Concept:

Below are the values of slump and their usage:

Placing Condition	Degree of Workability	Slump, mm
Mud mat, shallow section, pavement using pavers	Very low	0.70 – 0.80 (Compacting factor)
Mass concrete; lightly reinforced slabs, beams, walls, columns; strip footings	Low	25-75
Heavily reinforced slabs, beams, walls, columns	Medium	50-100
Slip formwork, pumped concrete	Medium	75-100
In situ piling, trench fill	High	100-150
Tremie concrete	Very high	150-200 (flow test as per IS 9103:1999)

Hence, it is clear that for slump value 50-100 mm the workability is medium and can be used for beams.

Important points:

Slump of the cone is a measure of height difference of cone height and concrete from top.

It indicates the workability of concrete (generally used for low to very high workability)

Along with Slump cone test, Vee-Bee consistometer test and Compacting factor test is also used to determine workability.