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Concrete Technology
Comments
Question
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.
Correct Answer
none of these.
Concrete Technology problems
Search Results
1. 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.
Show Answer
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Discuss
Correct Answer: 28 days.
2. 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.
Show Answer
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Discuss
Correct Answer: screed vibrator
3. 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).
4. Pick up the correct statement from the following:
Options
A. Bulking of sand is caused due to formation of a thin film of surface moisture
B. Fine sand bulks more than coarse sand
C. With 10% moisture content by weight, the bulking of sand is increased by 50%.
D. The volume of fully saturated sand, is equal to the volume of dry and loose sand
E. All the above.
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Correct Answer: All the above.
5. For a rectangular foundation of width
b
, eccentricity of load should not exceed
Options
A.
b
/2
B.
b
/3
C.
b
/4
D.
b
/5
E.
b
/6.
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Correct Answer:
b
/6.
6. 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.
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Correct Answer: Portland-pozzolana cement
7. 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
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Correct Answer: M 500
8. 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.
9. 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
10. 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.
Show Answer
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Correct Answer: all the above.
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