Important Question for GTU Exam
Describe the wet process of manufacturing
of cement stepwise.
2. Describe Composition of concrete in
details.
3. State the different types of cement
with its use.
4. Enlist and Explain functions of each
Bogue’s compound.
5. Explain: ‘hydration of cement ’
and heat of hydration’.
6. Explain: Field testing of cement.
7. Classification of aggregates based on
shape.
8. Explain: Bulking of fine aggregates.
9. Describe test for fineness modulus of
aggregates.
10. Explain quality of water for concrete.
11. Define workability. Discuss factors
affecting workability.
12. Explain segregation and bleeding
\13.State tests on workability. Explain
Slump test with sketch.
14. Explain need of curing. State different methods of curing of concrete.
15. |
State factors affecting compressive strength
of concrete. |
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16. |
Write Short notes on
: 1. Water/cement ratio
2. Gel/Space ratio
3. Effect of age on strength of concrete |
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17 |
Discuss the various factor
affecting creep & effect of creep on concrete. |
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18 |
Define shrinkage.
Explain in details types of shrinkage. |
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19. Define durability. Give the various
factors affecting durability. |
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20. Discuss the permeability phenomenon. |
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21.
What are the factors affecting permeability? |
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22.
Write short note on “Alkali aggregate reaction and sulphate attack”. |
1. Define
concrete mix design. Give its objectives. List methods of concrete mix design.
2.
State the steps involved in choice of mix
proportion and describe any two in detail.
3.
Using IS method of mix design, find out
proportions of concrete for following data:
Grade of Concrete: M 30
Degree of Control: Very good
Maximum size of Aggregate: 20 mm
Specific gravity of Cement: 3.15
Specific gravity of FA: 2.60
Specific gravity of CA: 2.62
Condition of Exposure: severe
Workability: 0.90 CF
Note: 5% of the low results are
acceptable and W/C ratio for 28 days strength of concrete is 0.49. Refer table
1 to 6.
Table– 1: Suggested valueofstandard
deviation:
Grade Concrete |
Standard Deviation for Different Degree ofControl |
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Verygood |
Good |
fair |
|
M 10 |
2.0 |
2.3 |
3.3 |
M 15 |
2.5 |
3.5 |
4.5 |
M 20 |
3.6 |
4.6 |
5.6 |
M 25 |
4.3 |
5.3 |
6.5 |
M 30 |
5.0 |
6.0 |
7.0 |
Table– 2 Valueof ‘t’
Accepted Proportion of LowResults |
Valueof ‘t’ |
1
in 5 |
0.84 |
1
in 10 |
1.28 |
1
in 15 |
1.50 |
1
in 20 |
1.65 |
1
in 40 |
1.86 |
1
in 100 |
2.33 |
Table– 3 Values
ofW/Cratio and compressivestrength
CompressiveStrength
in N/mm2at 28 days |
W/Cratio |
20 |
0.60 |
25 |
0.525 |
30 |
0.48 |
35 |
0.42 |
40 |
0.375 |
45 |
0.335 |
Table– 4 W/Cratios
as per DurabilityRequirements
ExposureCondition |
Maximum W/Cratio |
Mild |
0.65 |
Moderate |
0.55 |
Severe |
0.45 |
Table– 5 Approximatelysand and
water content
perm3 of concrete forgradeup
to M 35
Nominal maximum
sizeof aggregatemm |
Water content permeter cubeof concretein
Kg |
Sand as %oftotal
aggregatebyabsolute volume |
10 |
208 |
40 |
20 |
186 |
35 |
40 |
165 |
30 |
Table–
6 Approximate AirContent
|
23. Design concrete
mix according
toIS:10262-1982recommended guide
Lines
by weight and volume fort he following design
stipulations.
1. Characteristic compressive
strength required at 28days=30 n/mm2
2. Maximum
size oft he aggregates
=20mm (angular).
3. Degree
of workability=0.8 CF.
4. Degree
of quality control
=good.
5. Exposure=mild
and water cement ratio =0.47.
6. Cement
used OPC53 grade.
7. Specific
gravity of cement,
coarse
aggregate
and fine aggregate are
3.15, 2.6 and 2.6 respectively.
8. Waterabsorptionofcoarseaggregateandfineaggregateare0.5%
And
1% respectively.
9. Free (surface) moisture
in coarse aggregate and
fine aggregate are
nil and
2% respectively
10. Sand of zone
III
11. Bulk
density of cement,
coarse
aggregate
and fine aggregate are
1440 kg/m3, 1600 kg/m3and 1800 kg/m3respectively.
12. Standard
deviation
is assumed to
be4 N/mm2.
24. State difference types of special
concrete and describe light weight concrete.
25. Write short notes on:
1. Fiber reinforced concrete
2. Pumped
concrete
3. Ready mix concrete
4. Precast
concrete
26. State methods of special concreting
methods.
27. Write short notes on:
1. Hot
weather concreting
2. Underwater concretin
28. State
Types of Non-destructive test. Explain Rebound hammer test and Ultrasonic pulse velocity test
29. Explain
Micro cracking of concrete .
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