CONCRETE TECHNOLOGY QUIZ

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CONCRETE TECHNOLOGY


  1. Under normal conditions using an ordinary cement, the period of removal of the form work, is :

  2. 14 days for bottom slabs of spans 4.6 m and more
    2 days for vertical sides of columns
    21 days for bottom beams over 6 m spans
    all the above.

  3. After casting, an ordinary cement concrete on drying

  4. expands
    mix
    shrinks
    none of these.

  5. Curing.

  6. preserves the properties of concrete
    prevents the loss of water by evaporation
    reduces the shrinkage of concrete
    all

  7. The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary m

  8. 1 : 2 : 8
    1 : 3 : 6
    1 : 2 : 4
    1 : 4 : 10

  9. Hydration of cement is due to chemical action of water with

  10. Dicalcium silicate and tricalcium aluminate
    Tricalcium silicate and dicalcium silicate
    Tricalcium aluminate and tricalcium alumino ferrite
    ALL OF ABOVE

  11. M10 grade of concrete approximates

  12. 1 : 2 : 4 mix
    1 : 1 : 2 mix
    1 : 3 : 6 mix
    1 : 1.5 : 3 mix

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

  14. size and shape of aggregates
    grading of aggregates
    specific gravity of aggregates
    size and shape of the container

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

  16. 7.5 cm
    5.0 cm
    2.5 cm
    10 cm

  17. The risk of segregation is more for

  18. larger proportion of maximum size aggregate
    coarser grading
    wetter mix
    all of above

  19. An aggregate is said to be flaky if its least dimension is less than

  20. 2/5th of mean dimension
    3/5th of mean dimension
    1/5th of mean dimension
    4/5th of mean dimension





ANSWERS
1.D 2.C 3.D 4.D 5.D 6.C 7.D 8.B 9.D 10.B
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