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Civil Engineering :: Concrete Technology

  1. Separation of coarse aggregates from mortar during transportation, is known

  2. A.

    bleeding

    B.

    creeping

    C.

    segregation

    D.
    shrinkage
    E.

    none of these.

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  3. According to the recommendations of IS : 456-1978, the expansion joints

  4. A.

    are provided where plane changes abruptly

    B.

    are provided to ensure minimum resistance

    C.

    are supported on separate columns

    D.

    do not carry reinforcement across them

    E.
    all the above.

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  5. Grading of sand causes great variation in

  6. A.

    workability of concrete

    B.

    strength of concrete

    C.

    durability of concrete

    D.

    handing and placing of concrete

    E.
    all the above.

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  7. Shrinkage in concrete can be reduced by using

  8. A.

    low water cement ratio

    B.

    less cement in the concrete

    C.

    proper concrete mix

    D.

    presaturated aggregates

    E.
    all the above.

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  9. Ordinary concrete is not used for concrete grade

  10. A.

    M 100

    B.

    M 150

    C.
    M 200
    D.

    M 250

    E.
    M 400

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  11. 1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of

  12. A.

    coarse aggregates

    B.

    fine aggregates

    C.

    neither (a) nor (b)

    D.

    both (a) and (b)

    E.

    none of these.

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  13. Pick up the correct statement from the following:

  14. A.

    The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing

    B.

    The total water is the free water and the amount actually absorbed by the aggregates

    C.

    Neither (a) nor (b)

    D.

    Both (a) and (b).

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  15. Addition of pozzolana to ordinary port land cement, causes

  16. A.

    decrease in early strength

    B.

    reduction in chemical action with sulphates

    C.

    increase in shrinkage

    D.

    reduction bleeding

    E.

    all the above.

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  17. Too wet concrete may cause

  18. A.

    weakness of concrete

    B.
    excessive laitance
    C.

    segregation

    D.

    lower density

    E.
    all the above.

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  19. Addition of pozzolana to cement causes

  20. A.

    reduction in permeability

    B.

    loss of heat of hydration

    C.

    reduction in bleeding

    D.
    increase in curing time
    E.

    all the above.

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