Workability Test || Compaction Factor Test || Industrial Training 《Day-4》

INTRODUCTION:
The compaction factor test is used for concrete which have low workability for which slump
test is not suitable. The test is sufficiently sensitive to enable difference in workability arising
from the initial process in the hydration of cement to be measured. Each test, therefore should
be carried out at a constant time interval after the mixing is completed, if strictly comparable
results are to be obtained. Convenient time for releasing the concrete from the upper hopper
has been found to be two minutes after the completion of mixing.
PROCEDURE:
1. Place the concrete sample gently in the upper hopper to its brim using the hand scoop and level it.
2. Cover the cylinder. Open the trapdoor at the bottom of the upper hopper so that concrete fall
into the lower hopper. Push the concrete sticking on its sides gently with the road.
3. Open the trapdoor of the lower hopper and allow the concrete to fall into the cylinder below.
4. Cut ofthe excess of concrete above the top level of cylinder using trowels and level it.
5. Clean the outside of the cylinder.
6. Weight the cylinder with concrete to the nearest 10 g. This weight is known as the weight of
partially compacted concrete (W1).
7. Empty the cylinder and then refill it with the same concrete mix in layers approximately 5 cm
deep, each layer being heavily rammed to obtain full compaction.
8. Level the top surface.
9. Weigh the cylinder with fully compacted. This weight is known as the weight of fully
compacted concrete (W2).
10. Find the weight of empty cylinder (W).
CALCULATION:
The compaction factor is defined as the ratio of the weight of partially compacted concrete to
the weight of fully compacted concrete. It shall normally to be stated to the nearest second
decimal place.
Compaction Factor Value= (W1-W) / (W2-W)
RESULT:
Compaction factor of the concrete =
The Compaction factor values ranges from 0.7 to 0.95.
VIVA QUESTION :
1. Compaction factor for heavily reinforced section with vibration is .
2. Modulus of elasticity, E is calculated using .
3. Concrete is filled in how many layers in slump cone in slump test .
4. How the compaction factor value is calculated?
5. Higher compaction implies higher .
6. Which test is used for the high workable concretes?
7. What is the compaction factor for medium degree of workability?
8. Which test used for low workable concretes?
9. Which test gives good results for rich mixes?
10. Workability of concrete is measured by
11. How many types of tests are there to find workability?
12. What are the dimensions of upper and lower hopper?
13. What is the length and diameter ofthe cylinder?
14. If compaction factor of concrete is .90, then workability is .
15. A compaction factor of .85 for a cement concrete sample indicates .
16. What is meant by workability?
17. Workability of concrete can be improved by .
18. Workability of concrete is directly proportional to .
19. Workability of concrete is inversely proportional to .
20. The water-cement ratio is the ratio of .
21. IS 456 of 2000 gives the modulus of elasticity as _
22. What is elastic strains?
23. Static modulus of elasticity of concrete has been related to its
24. If the value of fck is 100 then what will be the modulus of elasticity?
25. Water cement ratio is
26. A lower ratio leads to
27. For concrete exposed to a very aggressive environment the w/c should be lower than
28. What is the range of water in M10?
29. What is the range of water in M15?
30. What is the range of water in M20?
31. What is the range of water in M25?
32. What is the approx. quantity of water in M5?
33. What is the approx. quantity of water in M7?
34. What is the approx. quantity of water in M10?
35. What is the gel/space ratio?
36. Who has established the relation between the strength and gel/space ratio?
37. Power showed that the strength of concrete bears a specific relationship with the
gel/space ratio. He found the relationship to be
38. What does 240 in power’s experiment stands for?
39. What does x in power’s experiment stands for?
40. What unit is present with the 240?
41. Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here
C stands for?
42. Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here
Wo stands for?
43. According to fig. what is the approx. value of strength of 50mm cube in MPa for gel space ratio .
44. Referring to the graph below, what is the approx. value of strength of 50mm cube in
MPa for gel-space ratio.
45. How many types of tests are there to find workability?
46. Workability of concrete is measured by
47. Which test gives good results for rich mixes?
48. Which test used for low workable concretes?
49. Which test Used for high workable concretes?
50. Which test used for fiber reinforced concrete?

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