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Concrete Technology
Comments
Question
The grade of concrete not recommended by I.S. : 456, is
Options
A. M 100
B. M 200
C. M 300
D. M 400
E. M 500
Correct Answer
M 500
Concrete Technology problems
Search Results
1. For construction of structures in sea water, the cement generally preferred to, is
Options
A. Portland-pozzolana cement
B. quick setting cement
C. low heat Portland cement
D. rapid hardening cement
E. none of these.
Show Answer
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Correct Answer: Portland-pozzolana cement
2. Addition of pozzolana to cement
Options
A. decreases workability
B. increases strength
C. increases heat of hydration
D. decreases curing time
E. none of these.
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Correct Answer: none of these.
3. Specified compressive strengh of concrete is obtained from cube tests at the end of
Options
A. 3 days
B. 7 days
C. 14 days
D. 21 days
E. 28 days.
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Correct Answer: 28 days.
4. For compacting plain concrete road surface of thickness less than 20 cm, we use
Options
A. internal vibrator
B. screed vibrator
C. form vibrator
D. none of these.
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Correct Answer: screed vibrator
5. Pick up the correct statement from the following:
Options
A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
B. The total water is the free water and the amount actually absorbed by the aggregates
C. Neither (a) nor (b)
D. Both (a) and (b).
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Correct Answer: Both (a) and (b).
6. Segregation is responsible for
Options
A. honey-combed concrete
B. porous layers in concrete
C. surface scaling in concrete
D. sand streaks in concrete
E. all the above.
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Correct Answer: all the above.
7. The final operation of finishing floors, is known as
Options
A. screeding
B. floating
C. trowelling
D. finishing
E. all the above.
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Correct Answer: trowelling
8. The produce impermeable concrete
Options
A. thorough mixing of concrete is required
B. proper compaction of concrete is required
C. proper curing of concrete is required
D. properly graded and non-porous aggregates are requied
E. all the above.
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Correct Answer: all the above.
9. According to the recommendations of IS : 456-1978, the expansion joints
Options
A. are provided where plane changes abruptly
B. are provided to ensure minimum resistance
C. are supported on separate columns
D. do not carry reinforcement across them
E. all the above.
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Correct Answer: all the above.
10. The datum temperature for maturity by Plowman, is
Options
A. 23°C
B. 0°
C. - 5.6°C
D. - 11.7°C
Show Answer
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Correct Answer: - 11.7°C
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