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  • Question
  • Setting time of cement increases by adding


  • Options
  • A. gypsum
  • B. hydrogen peroxide
  • C. calcium chloride
  • D. sodium oxide
  • E. none of these.

  • Correct Answer
  • gypsum 


  • Concrete Technology problems


    Search Results


    • 1. Strength of concrete with passage of time

    • Options
    • A. increases
    • B. decreases
    • C. fluctuates
    • D. remains constant.
    • Discuss
    • 2. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

    • Options
    • A. between 150 to 300 kg/cm2
    • B. between 350 to 600 kg/cm2
    • C. between 150 to 500 kg/cm2
    • D. below 200 kg/cm2
    • E. none of these.
    • Discuss
    • 3. Permissible compressive strength of M 200 concrete grade is

    • Options
    • A. 100 kg/cm2
    • B. 150 kg/cm2
    • C. 200 kg/cm2
    • D. 250 kg/cm2
    • E. 300 kg/cm2
    • Discuss
    • 4. Cement used for normal concrete construction, is obtained by burning a mixture of

    • Options
    • A. silicious and argillaceous materials
    • B. argilaceous and calcareous materials
    • C. silicious and catcareous materials
    • D. silicious, argillaceous and calcareous materials
    • E. none of these.
    • Discuss
    • 5. For preparing ordinary concrete, the quantity of water used, is

    • Options
    • A. 5% by weight of aggregates plus 20% of weight of cement
    • B. 10% by weight of aggregates plus 10% of weight of cement
    • C. 5% by weight of aggregates plus 30% of weight of cement
    • D. 30% by weight of aggregates plus 10% of weight of cement
    • E. none of these.
    • Discuss
    • 6. A flaky aggregate is said to be elongated if its length is

    • Options
    • A. equal to the mean size
    • B. twice the mean size
    • C. thrice the mean size
    • D. four times the mean size
    • E. five times the mean size.
    • Discuss
    • 7. Higher workability of concrete is required if the structure is

    • Options
    • A. made with cement concrete
    • B. thick and reinfored
    • C. thin and heavily reinforced
    • D. thick and heavily reinfored.
    • Discuss
    • 8. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation

    • Options
    • A. 0.1P + 0.3Y + 0.1Z = W/C x P
    • B. 0.3P + 0.1Y + 0.01Z = W/C x P
    • C. 0.4P + 0.2Y + 0.01Z = W/C x P
    • D. 0.5P + 0.3Y + 0.01Z = W/C x P
    • E. 0.2P + 0.5Y + 0.1Z = W/C x P
    • Discuss
    • 9. Expansion joints are provided if the length of concrete structures exceeds

    • Options
    • A. 10 m
    • B. 15 m
    • C. 15 m
    • D. 35 m
    • E. 45 m
    • Discuss
    • 10. According to IS : 382-1963, a good aggregate should be

    • Options
    • A. chemically inert
    • B. sufficiently strong
    • C. hard and durable
    • D. all the above.
    • Discuss


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