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Concrete Technology
Comments
Question
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.
Correct Answer
all the above.
Concrete Technology problems
Search Results
1. 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
2. Batching error means inaccuracy in the quantity of
Options
A. aggregates
B. cement
C. water
D. all the above.
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Correct Answer: all the above.
3. Hardening of cement occurs at
Options
A. rapid rate during the first few days and afterwards it continues to increase at a decreased rate
B. slow rate during the first few days and afterwards it continues to increase at a rapid rate
C. uniform rate throughout its age
D. none of these.
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Correct Answer: none of these.
4. A construction joint is provided where
Options
A. bending moment is small
B. shear force is small
C. the member is supported by other member
D. all the above.
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Correct Answer: all the above.
5. Pick up the correct statement from the following:
Options
A. Construction joints are necessarily planned for their locations
B. Expansion joints are provided to accommodate thermal expansion
C. Construction joints are provided to control shrinkage cracks
D. Expansion joints need not be provided in foundation concrete
E. All the above.
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Correct Answer: All the above.
6. 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.
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Correct Answer: All the above.
7. Too wet concrete may cause
Options
A. weakness of concrete
B. excessive laitance
C. segregation
D. lower density
E. all the above.
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Correct Answer: all the above.
8. 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.
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Correct Answer: All the above.
9. 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%
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Correct Answer: 30%
10. 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
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