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Aggregates for Concrete Questions and Answers

1.

Which of the following is a lightweight and manufactured aggregate, which is used to produce lightweight concrete?

Exam Year(s)

DSSSB JE - 2023,

Answer: C

Bloated clay (expanded clay) is a manufactured lightweight aggregate. Clay is heated in a rotary kiln until gases are given off and make it swell into light, cellular pellets. Diatomite, tuff and pumice are naturally occurring lightweight materials: diatomite is formed from the fossil shells of diatoms, tuff from volcanic ash and pumice from volcanic froth. They are used as found, and so are not manufactured aggregates.

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2.

Which of the following IS codes provides guidelines for estimation of deleterious materials and organic impurities present in the aggregates used for making concrete?

Exam Year(s)

DSSSB JE - 2023,

Answer: A

IS 2386 (Part II) - 1963 covers the estimation of deleterious materials and organic impurities in aggregates for concrete (clay, silt, coal, shale, organic matter and so on). Part I of IS 2386 deals with particle size and shape, and Part IV deals with mechanical properties such as crushing and abrasion values. IS 383 gives the specification for coarse and fine aggregates from natural sources, and sets limits for these materials but is not the test method.

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3.

What should be the maximum aggregate crushing value used in concrete roads and pavements as per IS:383-1970?

Exam Year(s)

DSSSB JE - 2023,

Answer: B

IS 383 limits the aggregate crushing value of coarse aggregate to 45 percent for concrete other than wearing surfaces, and to 30 percent for aggregate used in concrete for wearing surfaces such as runways, roads and pavements. A wearing surface is exposed to abrasion and traffic, so a stronger aggregate is needed. The values of 20, 40 and 50 percent are not the limits in the code.

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