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  • Question
  • Workability improved by adding


  • Options
  • A. fly ash
  • B. hydrated lime
  • C. calcium chloride
  • D. bentonite
  • E. all the above.

  • Correct Answer
  • all the above. 


  • Concrete Technology problems


    Search Results


    • 1. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

    • Options
    • A. 20.5 mm
    • B. 30.5 mm
    • C. 40.5 mm
    • D. 50.5 mm
    • E. none of these.
    • Discuss
    • 2. Pozzolanic properties exist in

    • Options
    • A. shales
    • B. fly ash
    • C. pumicite
    • D. diatomaceous clay
    • E. all the above.
    • Discuss
    • 3. For the construction of the retaining structures, the type of concrete mix to be used, is

    • Options
    • A. 1 : 3 : 6
    • B. 1 : 2 :4
    • C. 1 : : 3
    • D. 1 : l : 2
    • E. 1 : 4 : 8.
    • Discuss
    • 4. If fineness modulus of sand is 2.5, it is graded as

    • Options
    • A. very fine sand
    • B. fine sand
    • C. medium sand
    • D. coarse sand
    • E. very coarse sand.
    • Discuss
    • 5. Vicat apparatus is used for

    • Options
    • A. fineness test
    • B. consistency test
    • C. test for setting time
    • D. test for tensile strength
    • E. none of these.
    • Discuss
    • 6. The dimensions of a 35 litre forma for measuring aggregates by volume, are :

    • Options
    • A. length 30 cm, breadth 25 cm, height 30 cm
    • B. length 39 cm, breadth 25 cm, height 32 cm
    • C. length 27 cm, breadth 27 cm, height 48 cm
    • D. length 220 cm, breadth 25 cm, height 40 cm
    • E. none of these.
    • Discuss
    • 7. For the construction of thin R.C.C. structures, the type of cement to be avoided, is

    • Options
    • A. ordinary Portland cement
    • B. rapid hardening cement
    • C. low heat cement
    • D. blast furnace slag cement
    • E. sulphate resisting cement.
    • Discuss
    • 8. Pick up the correct statement from the following:

    • Options
    • A. The concrete gains strength due to hydration of cement
    • B. The concrete cured at a temperature below 23°C, gains strength up to 28 days
    • C. The concrete does not set at freezing point
    • D. The strength of concrete increases with its age
    • E. All the above.
    • Discuss
    • 9. Concrete gains strength due to

    • Options
    • A. chemical reaction of cement with sand and coarse aggregates
    • B. evaporation of water from concrete
    • C. hydration of cement
    • D. All the above.
    • Discuss
    • 10. If the slump of a concrete mix is 60 mm, its workability is

    • Options
    • A. very low
    • B. low
    • C. medium
    • D. high
    • E. none of these.
    • Discuss


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