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Concrete Technology
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Question
Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is
Options
A. 30%
B. 40%
C. 50%
D. 60%
E. 70%
Correct Answer
30%
Concrete Technology problems
Search Results
1. Pick up the correct statement from the following:
Options
A. Lime in excess, causes the cement to expand and disintegrate
B. Silica in excess, causes the cement to set slowly
C. Alumina in excess, reduces the strength of the cement
D. Magnesium oxide in excess, remains in free state and makes the cement unsound
E. All the above.
Show Answer
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Discuss
Correct Answer: All the above.
2. Too wet concrete may cause
Options
A. weakness of concrete
B. excessive laitance
C. segregation
D. lower density
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
3. Pick up the correct statement from the following:
Options
A. Water cement paste hardens due to hydration
B. During hardening cement binds the aggregates together
C. Cement provides strength, durability and water tightness to the concrete
D. All the above.
Show Answer
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Discuss
Correct Answer: All the above.
4. Addition of pozzolana to cement causes
Options
A. reduction in permeability
B. loss of heat of hydration
C. reduction in bleeding
D. increase in curing time
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
5. The maximum thickness of concrete floor of a cement warehouse, is
Options
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
E. 30 cm
Show Answer
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Discuss
Correct Answer: 25 cm
6. Separation of coarse aggregates from mortar during transportation, is known
Options
A. bleeding
B. creeping
C. segregation
D. shrinkage
E. none of these.
Show Answer
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Discuss
Correct Answer: segregation
7. Pick up the incorrect statement from the following:
Options
A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
B. The strength of concrete decreases as the water cement ratio increases
C. If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure
D. Good compaction by mechanical vibrtions, increases the strength of concrete
E. None of these.
Show Answer
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Discuss
Correct Answer: A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
8. The process of hardening the concrete by keeping its surface moist is known
Options
A. placing
B. wetting
C. curing
D. compacting
E. none of these.
Show Answer
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Discuss
Correct Answer: curing
9. The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are
Options
A. 1500 bags
B. 2000 bags
C. 2500 bags
D. 3000 bags
E. 4000 bags
Show Answer
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Discuss
Correct Answer: 3000 bags
10. Pick up the incorrect statement from the following:
Options
A. The degree of grinding of cement, is called
fineness
B. The process of changing cement paste into hard mass, is known as
setting of cement
C. The phenomenon by virtue of which cement does not allow transmission of sound, is known as
soundness of cement
D. The heat generated during chemical reaction of cement with water, is known as
heat of hydration
E. None of these.
Show Answer
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Discuss
Correct Answer: The phenomenon by virtue of which cement does not allow transmission of sound, is known as
soundness of cement
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