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  • Question
  • High temperature


  • Options
  • A. increases the strength of concrete
  • B. decreases the strength of concrete
  • C. has no effect on the strength of concrete
  • D. none of these.

  • Correct Answer
  • decreases the strength of concrete 


  • Concrete Technology problems


    Search Results


    • 1. For preparing a test-specimen, it is necessary

    • Options
    • A. to mix cement and fine aggregate by dry hand
    • B. to mix coarse aggregates
    • C. to mix water to the cement, fine aggregates and coarse aggregates
    • D. to oil inner surface of the mould and the base plate, before placing concrete
    • E. all the above.
    • Discuss
    • 2. Pick up the incorrect statement from the following:

    • Options
    • A. In properly graded aggregates, bulk density is more
    • B. In single size aggregates, bulk density is least
    • C. In single size aggregates, bulk density is maximum
    • D. None of these.
    • Discuss
    • 3. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

    • Options
    • A. rounded aggregate
    • B. irregular aggregate
    • C. angular aggregate
    • D. flaky aggregate
    • E. none of these.
    • Discuss
    • 4. The condition not applicable to water cement ratio law, is

    • Options
    • A. internal moisture conditions on hydration continue till complete strength is gained
    • B. concrete specimens may be tested at any temperature
    • C. concrete specimens need be of same age
    • D. concrete specimens need be of same size
    • E. none of these.
    • Discuss
    • 5. The void ratio of

    • Options
    • A. single size coarse aggregate is roughly 0.45.
    • B. graded coarse aggregate is roughly 0.040
    • C. fine aggregate is roughly 0.45
    • D. all the above.
    • Discuss
    • 6. The type of aggregates of same nominal size, which contain less voids when compacted, are

    • Options
    • A. rounded spherical
    • B. irregular
    • C. flaky
    • D. none of these.
    • Discuss
    • 7. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

    • Options
    • A. 100 kg/cm2
    • B. 150 kg/cm2
    • C. 200 kg/cm2
    • D. 250 kg/cm2
    • E. 300 kg/cm2
    • Discuss
    • 8. Slump test of concrete is a meausre ofits

    • Options
    • A. consistency
    • B. compressive strength
    • C. tensile strength
    • D. impact value.
    • Discuss
    • 9. The bulk density of aggregates, is generally expressed as

    • Options
    • A. tonnes/cubic metre
    • B. kg/cubic metre
    • C. kg/litre
    • D. g/cm3
    • E. none of these.
    • Discuss
    • 10. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

    • Options
    • A. 15, 900 litres
    • B. 16, 900 litres
    • C. 17, 900 litres
    • D. 18, 900 litres
    • Discuss


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