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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.
    • Discuss
    • 2. Too wet concrete may cause

    • Options
    • A. weakness of concrete
    • B. excessive laitance
    • C. segregation
    • D. lower density
    • E. all the above.
    • Discuss
    • 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.
    • Discuss
    • 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.
    • Discuss
    • 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
    • Discuss
    • 6. Separation of coarse aggregates from mortar during transportation, is known

    • Options
    • A. bleeding
    • B. creeping
    • C. segregation
    • D. shrinkage
    • E. none of these.
    • Discuss
    • 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.
    • Discuss
    • 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.
    • Discuss
    • 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
    • Discuss
    • 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.
    • Discuss


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