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Concrete Technology
Comments
Question
Addition of pozzolana to ordinary port land cement, causes
Options
A. decrease in early strength
B. reduction in chemical action with sulphates
C. increase in shrinkage
D. reduction bleeding
E. all the above.
Correct Answer
all the above.
Concrete Technology problems
Search Results
1. Water required per bag of cement, is
Options
A. 7 kg
B. 14 kg
C. 21 kg
D. 28 kg
E. 35 kg
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Correct Answer: 35 kg
2. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is
Options
A. 10%
B. 12%
C. 15%
D. 20%
E. 25%.
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Correct Answer: 25%.
3. Proper batching ensures
Options
A. economy
B. durability
C. workability
D. strength
E. all the above.
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Correct Answer: all the above.
4. C.R.R.I. charts are used to obtain a relatioship between strength of concrete and
Options
A. water cement ratio
B. workability
C. grading of aggregate
D. fineness modulus
E. none of these.
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Correct Answer: water cement ratio
5. Pick up the incorrect statement from the following:
Options
A. The bottom and top ends of slump mould are parallel to each other
B. The axis of the mould is perpendicular to the end faces
C. The internal surface of the mould is kept clean and free from set cement
D. The mould is in the form of a frustum of hexagonal pyramid
E. None of these.
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Correct Answer: The mould is in the form of a frustum of hexagonal pyramid
6. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:
Options
A. 70 litres of sand and 120 litres of aggregates
B. 70 kg of sand and 140 litres of aggregates
C. 105 litres of sand and 140 litres of aggregates
D. 105 litres of sand and 210 litres of aggregates
E. none of these.
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Correct Answer: 105 litres of sand and 210 litres of aggregates
7. ISI has specified full strength of concrete after
Options
A. 7 days
B. 14 days
C. 21 days
D. 28 days
E. none of these.
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Correct Answer: none of these.
8. 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.
9. 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.
10. 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.
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