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Civil Engineering :: Concrete Technology

Concrete Technology - Section 1
Concrete Technology - Section 2
Concrete Technology - Section 3
  1.  

    After casting, an ordinary cement concrete on drying
    2. A.

    expands
    B.
    mix
    C.
    shrinks
    D.

    none of these.

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  2.  

    Hydration of cement is due to chemical action of water with
    3. A.

    Tricalcium silicate and dicalcium silicate
    B.

    Dicalcium silicate and tricalcium aluminate
    C.
    Tricalcium aluminate and tricalcium alumino ferrite
    D.

    All the above.

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  3. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

    4. A.

    1100° and 1200°C
    B.

    1200° and 1300°C
    C.

    1300° and 1400°C
    D.

    1400° and 1500°C
    E.

    1500° and 1600°C

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  4. Permissible compressive strength of M 300 concrete grade is

    5. A.

    100 kg/cm2
    B.

    150 kg/cm2
    C.

    200 kg/cm2
    D.

    250 kg/cm2
    E.

    300 kg/cm2

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  5. The standard sand now a days used in India, is obtained from

    6. A.

    Jaipur (Rajasthan)
    B.

    Jullundur (Punjab)
    C.

    Hyderabad (Andhra Pradesh)
    D.

    Ennore (Madras)
    E.

    Cuttuck (Orissa).

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  6.  

    The maximum amount of dust which may be permitted in aggregates is
    7. A.

    5% of the total aggregates for low workability with a coarse grading
    B.

    10% of the total aggregates for low workability with a fine grading
    C.

    20% of the total aggregates for a mix having high workability with fine grading
    D.

    all the above.

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  7. Proper proportioning of concrete, ensures
    8. A.

    desired strength and workability
    B.

    desired durability
    C.

    water tightness of the structure
    D.

    resistance to water
    E.

    all the above.

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  8. The bulk density of aggregates does not depend upon :

    9. A.
    size and shape of aggregates
    B.

    specific gravity of aggregates
    C.

    grading of aggregates
    D.

    size and shape of the container
    E.

    none of these.

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  9. Curing
    10. A.

    reduces the shrinkage of concrete
    B.

    preserves the properties of concrete
    C.

    prevents the loss of water by evaporation
    D.
    all of the above.

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  10.  

    While compacting the concrete by a mechanical vibrator, the slump should not exceed
    11. A.

    2.5 cm
    B.

    5.0 cm
    C.

    7.5 cm
    D.

    10 cm
    E.

    15 cm

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