Civil Engineering - Concrete Technology

6. 

Pozzolanic properties exist in

A. shales
B. fly ash
C. pumicite
D. diatomaceous clay
E. all the above.

Answer: Option E

Explanation:

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7. 

An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than

A. 22.5 mm
B. 18.5 mm
C. 16.5 mm
D. 15.5 mm
E. 13.5 mm.

Answer: Option E

Explanation:

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8. 

Expansion joints are provided if the length of concrete structures exceeds

A. 10 m
B. 15 m
C. 15 m
D. 35 m
E. 45 m

Answer: Option E

Explanation:

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9. 

Workability improved by adding

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

Answer: Option E

Explanation:

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10. 

If the slump of a concrete mix is 60 mm, its workability is

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

Answer: Option C

Explanation:

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