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- Question
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.
- Correct Answer
- 105 litres of sand and 210 litres of aggregates
- 1. 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. Discuss
- 2. Water required per bag of cement, is
Options- A. 7 kg
- B. 14 kg
- C. 21 kg
- D. 28 kg
- E. 35 kg Discuss
- 3. 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%. Discuss
- 4. Proper batching ensures
Options- A. economy
- B. durability
- C. workability
- D. strength
- E. all the above. Discuss
- 5. 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. Discuss
- 6. 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. Discuss
- 7. 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. Discuss
- 8. 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. Discuss
- 9. 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. Discuss
- 10. Batching error means inaccuracy in the quantity of
Options- A. aggregates
- B. cement
- C. water
- D. all the above. Discuss
Concrete Technology problems
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Correct Answer: all the above.
Correct Answer: 35 kg
Correct Answer: 25%.
Correct Answer: all the above.
Correct Answer: water cement ratio
Correct Answer: none of these.
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: none of these.
Correct Answer: all the above.
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