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  • Question
  • 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.

  • Correct Answer
  • none of these. 


  • Concrete Technology problems


    Search Results


    • 1. 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.
    • Discuss
    • 2. 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
    • 3. Water required per bag of cement, is

    • Options
    • A. 7 kg
    • B. 14 kg
    • C. 21 kg
    • D. 28 kg
    • E. 35 kg
    • Discuss
    • 4. 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
    • 5. Proper batching ensures

    • Options
    • A. economy
    • B. durability
    • C. workability
    • D. strength
    • E. all the above.
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Batching error means inaccuracy in the quantity of

    • Options
    • A. aggregates
    • B. cement
    • C. water
    • D. all the above.
    • Discuss
    • 10. 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
    • Discuss


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