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


  • Options
  • A. coarse aggregates
  • B. fine aggregates
  • C. neither (a) nor (b)
  • D. both (a) and (b)
  • E. none of these.

  • Correct Answer
  • both (a) and (b) 


  • Concrete Technology problems


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    • 1. Workability of concrete for a given water content is good if the aggregates, are

    • Options
    • A. rounded aggregate
    • B. irregular aggregate
    • C. angular aggregate
    • D. flaky aggregates.
    • Discuss
    • 2. For an ordinary Portland cement

    • Options
    • A. residual does not exceed 10% when sieved through IS Sieve No. 9
    • B. soundness varies from 5 to 10 mm
    • C. initial setting time is not less than 30 minutes
    • D. compressive stress after 7 days, is not less than 175 kg/cm2
    • E. all the above.
    • Discuss
    • 3. The datum temperature for maturity by Plowman, is

    • Options
    • A. 23°C
    • B. 0°
    • C. - 5.6°C
    • D. - 11.7°C
    • Discuss
    • 4. According to the recommendations of IS : 456-1978, the expansion joints

    • Options
    • 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.
    • Discuss
    • 5. The produce impermeable concrete

    • Options
    • A. thorough mixing of concrete is required
    • B. proper compaction of concrete is required
    • C. proper curing of concrete is required
    • D. properly graded and non-porous aggregates are requied
    • E. all the above.
    • Discuss
    • 6. You are asked to construct a massive dam, the type of cement you will use, is

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

    • Options
    • A. According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight
    • B. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky
    • C. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous
    • D. All the above.
    • Discuss
    • 8. Ordinary concrete is not used for concrete grade

    • Options
    • A. M 100
    • B. M 150
    • C. M 200
    • D. M 250
    • E. M 400
    • Discuss
    • 9. Grading of sand causes great variation in

    • Options
    • A. workability of concrete
    • B. strength of concrete
    • C. durability of concrete
    • D. handing and placing of concrete
    • E. all the above.
    • Discuss
    • 10. Pick up the correct statement from the following:

    • Options
    • A. Segregation is necessary for a workable concrete
    • B. Consistency does not affect the workability of concrete
    • C. If the slump increases, workability decreases
    • D. If the concrete mix is dry, the slump is maximum
    • E. None of these.
    • Discuss


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