Workability Test ( W/C ratio= 0.45, 0.5, 0.55) || Slump Cone test || Industrial Training 《Day-4》

Concrete slump test is carried out from batch to batch to check the uniform quality of concrete
during construction. The slump test is the simplest workability test for concrete, involves low
cost and provides immediate results. Generally concrete slump value is used to find the
workability, which indicates water-cement ratio, but there are various factors including
properties of materials, mixing methods, dosage, admixtures etc. also affect the concrete slump
value.
1. Very low workability: slump value 0-25mm or 0-1 inch
2. Low workability: slump value 25-50mm or 1-2 inch
3. Medium workability: slump value 50-100mm or 2-4 inch
4. High workability: slump value 100-175mm or 4-7 inch
True Slump - True slump is the only slump that can be measured in the test. The measurement
is taken between the top of the cone and the top of the concrete after the cone has been removed
as shown in figure.
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 Zero Slump - Zero slump is the indication of very low water-cement ratio, which results in
dry mixes. These type of concrete is generally used for road construction.
 Collapsed Slump - This is an indication that the water-cement ratio is too high, i.e. concrete
mix is too wet or it is a high workability mix, for which a slump test is not appropriate.
 Shear Slump - The shear slump indicates that the result is incomplete, and concrete to be
retested.
PROCEDURE:
1. Clean the internal surface of the mould and apply oil.
2. Place the mould on a smooth horizontal non- porous base plate.
3. Fill the mould with the prepared concrete mix in 4 approximately equal layers.
4. Tamp each layer with 25 strokes of the rounded end of the tamping rod in a uniform manner
over the cross section of the mould. For the subsequent layers, the tamping should penetrate
into the underlying layer.
5. Remove the excess concrete and level the surface with a trowel.
6. Clean away the mortar or water leaked out between the mould and the base plate.
7. Raise the mould from the concrete immediately and slowly in vertical direction.
8. Measure the slump as the difference between the height of the mould and that of height point
of the specimen being tested.
VIVA Question----
1. A slump of 50-100mm can be used for .
2. Concrete is filled in how many layers in slump cone in slump test .
3. How many hoppers are there in compaction factor test?
4. What is the standard w/c value for nominal mix of concrete?
5. Slump value required for RCC Slab?
6. What is true slump?
7. Size of Concrete Cubes?
8. What are the dimensions of the slump cone?
9. List out workability tests?
10. How many strokes for each layer?
11. What is the slump value for low workability?
12. Slump value 100 - 175mm indicates workability.
13. What is zero slump?
14. What is collapsed slump?
15. What is shear slump?
16. What is segregation of concrete?
17. Workability means?
18. What is the density of concrete?
19. What is the slump value for medium workability?
20. What is the slump value in inch for higher workability?
21. What do you mean by workability?
22. Workability of concrete can be improved by addition
23. List out Workability Tests?
24. Slump value required for RCC Slab?
25. What is Segregation of concrete?
26. What is the standard w/c value for nominal mix of concrete?
27. How many types of tests are there to find workability?
28. These test find workability
29. Workability of concrete is measured by
30. Which test gives good results for rich mixes?
31. Which test used for low workable concretes?
32. Which test Used for high workable concretes?
33. Which test used for fiber reinforced concrete?
34. is practical in field test.
35. What is the compaction factor for medium degree of workability?
36. What is the Vee-Bee time for medium degree of workability?
37. The water-cement ratio is the ratio of
38. A lower ratio leads to
39. Workability can be resolved
40. How to improve the workability of concrete.
41. What is workability?
42. What is the compaction factor for low degree of workability?
43. What is the compaction factor for medium degree of workability?
44. What is the Vee-Bee time for medium degree of workability?
45. Clay minerals are found in most

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