Top 200 Interview Questions for Civil Engineer or QC Civil Inspector
ARAMCO Standards
Q1. What are the minimum concrete cylinders should be cast for each set to be tested for compression strength as per Saudi Aram co standard? ( 4 )
Q2. What is
the maximum allowable fresh concrete temperature until used as per Saudi Aramco standard? (
32 OC )
Q3. What are
the requirements of water to be used for curing concrete specimens as per ASTM
specification? (SWEET WATER , MAX TDS =1000 ppm)
Q4. In what
temperature range should concrete specimen be cured as per ASTM specification? (23 +- 2_ OC)
Q5. At what
age concrete cylinders should be tested for Saudi Aram co projects? (3,7,28 Days)
Q6. How
frequent shall concrete capping material is tested? (Every lot should be tested)
Q7.How many
minutes does it take to complete temperature measurement after obtaining
sample? (2-1/2 Minute)
Q8. The
molding of strength test specimens shall begin within ( 15 min )minutes after fabricating the
composite sample.
Q9. The
slump test is filled in ( 3 )
layers. And each layer shall be rod for ( 25 strokes).
Q10. The
diameter of standard tamping rod casting six inches diameter cylinder is 5/8" (16mm) and its length approximately is 24"(600mm) .
Q11. How
many seconds does ASTM specifies to remove the slump cone? ( 5 +- 2 sec)
Q12. The
number of blows, layers, and size of proctor molds depends on ( Gradation ) of
soil?
Q13. How
many layers do you apply during standard proctor compaction?
A:
(Mold dia 4" 3 layers, 25 Blows/layer
B:
Mold dia 6" 3 Layers, 56 blows/layer
Q14. How
many layers does the modified proctor consist of? ( 5 Layers ( 56 Blows )
Q15. How
many points (as minimum) does modified proctor test should be consisted of? Minimum (4 Points),
Preferred 5 Point.
Q16. How
many hours should CBR samples be soaked? ( 96 Hrs
)
Q17. What
sieve size do you need to obtain a sample for liquid/plastic limits? ( # 40 )
Q18.
At what temperature do you dry soil sample that is prepared for gradation only?
(110 + 5 0C)
Q19. Briefly
explain how to prepare a soil sample for gradation?
Answer:
a: Quartering the
sample
b: Keep the sample in oven for dry at 110 +
5 degree centigrade
c: Sieve the material on
specified meshes and note the retained weight on each sieve.
d: Calculate the percent
passing for each sieve.
Q20. At what
sieve size do you wash soil sample in order to determine the % of fine
materials?
( #
200 ) sieve.
Q21. What
are the Safety equipment do you need when you perform field density test using
nuclear gauges? ( TLD, 3 meter away from Nuclear
)
Q22. Briefly
describe how to conduct field density test using a nuclear gauge?
Answer:
·
Take standard count
for density and moisture to confirms the counts as per calibration Certificate
·
Select the location
at least 10 meter away from structure and make hole by rod minimum 2'' more
deeper the testing depth.
·
Keep the Nuclear at
hole in position so that the soil not disturbed by rod.
·
Check DD, moisture
content and percentage compaction.
Q23. Briefly
describe how to run CBR test as per ASTM procedures (compaction and
penetration)?
Answer:
Prepare
3 specimen molds for compaction as follow:
10-Blows 5
Layers
25-Blows
''
56-Blows ''
After
compaction soak the specimen for 96 Hrs, drain for 15 minute after soaking and
crush taking reading @ 1", 2" penetration.
Q24. What is
the minimum weight of fine aggregate for sieve analysis as per ASTM C136?
Answer:
- 2000g
- 100g
- 300 g
- 1000g
- 1500g
Q25. After
the soundness cycles, what sieve sizes do you use to determine fine aggregate
loss?
Answer:
a. # 4'' b. # 1/4'' c. 5/16'' d. ( In the same sieve on which it
was retained before the test.)
Q26. After
the soundness cycles, what sieve sizes do you use to determine coarse
aggregate loss?
Answer:
a. # 4'' b. # 1/4'' c. # 5/16'' d. (depends on aggregate fraction size.)
Passing Retain Washing
2 1/2'' 1/2'' # 1 1/4''
1/2'' 3/4'' # 5/8''
3/4'' 3/8'' # 5/16''
3/8'' # 4'' # 5
For fine than same size will be used.
Q27. What is
the minimum weight of coarse aggregate for sieve analysis as per ASTM C 136?
Answer:
Size Kg
2'' 20
1 1/2'' 15
1'' 10
3/4'' 5
1/2'' 2
3/8'' 1
a. 2000g b. 100g c.
1000g
d. 1500g e. (Depend upon the
maximum aggregate size) .
Q28. How
many cycles are there for soundness test? ( 5
cycles )
Q29. What is
the ASTM specified reading requirement of specific gravity of soundness
solution? ( MgSo4 ___> 1.295 __ 1.308 )
Q30. What
type of solution shall be used to perform soundness test as per Saudi Aram co
requirements? (MgSo4,
Sodium Sulphate )
Q31. Clay
lump samples shall be soaked for:
Answer:
a. 12 +/- 4 hours. b.
300g c. ( 24 +/- 4 hours ) d. 48 +/- 4 hours.
Q32. To prepare
Clay Lump fraction as per ASTM C 142, the mass of aggregate should be:
Answer:
a. 500g b. 300g
c. 10,000g d. (Depends on the aggregate)
Q33. Prior
running liquid limit, you should place the prepare material in its mixing dish
and cover to prevent moisture loss for at least (16
) hours.
Q34. Explain
in brief how you perform Maximum Index Density and Unit weight of soil using a Vibrating
Table (using wet method)?
Answer:
1. Take Minimum density loose
2. Keep mold on vibrating table
surcharge weight on it
3. Remove water from top of mold with
sponge.
4. Sample should be in SSD condition.
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