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Concrete Technology Sheet 24

  • 1) Question.

    Which one of the following types of concrete is most suitable in extreme cold climates?

    Answer.

    Air-entrained concrete is suitable  in extreme cold climates as air entrainment increases the resistance of the hardened concrete to freezing and thawing and normally at the same time improves the workability of fresh concrete.

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  • 2) Question.

    What is the range of fineness modulas of sand which is least suitable for making good concrete?

    Answer.

    For the aggregate commonly used, the fineness modulus of fine aggregate varies between 2.0 and 3.2 for making good concrete

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  • 3) Question.

    Which method of curing of concrete is recommendable for rapid gain of strength of concrete?

    Answer.

    High-pressure steam curing is generally recommended for rapid gain of strength of concrete

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  • 4) Question.

    The cement and water slurry coming on the top and setting on thge surface is called

    Answer.
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  • 5) Question.

    Polymer Concrete is most suitable for

    Answer.

    Polymer concrete have high sulphate and acid resistance properties, therefore it is most suitable for sewage disposal work.

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  • 6) Question.

    Harshness in concrete is due to the excess of -

    Answer.
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  • 7) Question.

    Segregation in concrete results in -

    Answer.
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  • 8) Question.

    The workability of concrete is defined as the -

    Answer.
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  • 9) Question.

    The breaking up of cohesion in a mass of concrete is called -

    Answer.
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  • 10) Question.

    The strength and durability of cocnrete depends upon -

    Answer.
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  • 11) Question.

    The practical utility of concrete technology for civil engineers is to -

    Answer.
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  • 12) Question.

    To make one cubic meter of 1 : 2 : 4 by volume of concrete, the volume of coarse aggregates required is

    Answer.

    1 m3 of wet concrete gives 1.52 dry volume of concrete.

    Coarse aggregate proportion = 4/7

    So, volume of coarse aggregate = (4/7) x 1.52 = 0.86 m3

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