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Concrete Technology
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Question
For the construction of the retaining structures, the type of concrete mix to be used, is
Options
A. 1 : 3 : 6
B. 1 : 2 :4
C. 1 :
: 3
D. 1 : l : 2
E. 1 : 4 : 8.
Correct Answer
1 :
: 3
Concrete Technology problems
Search Results
1. If fineness modulus of sand is 2.5, it is graded as
Options
A. very fine sand
B. fine sand
C. medium sand
D. coarse sand
E. very coarse sand.
Show Answer
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Discuss
Correct Answer: fine sand
2. Vicat apparatus is used for
Options
A. fineness test
B. consistency test
C. test for setting time
D. test for tensile strength
E. none of these.
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Correct Answer: consistency test
3. 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
Options
A. 22.5 mm
B. 18.5 mm
C. 16.5 mm
D. 15.5 mm
E. 13.5 mm.
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Correct Answer: 13.5 mm.
4. According to IS : 382-1963, a good aggregate should be
Options
A. chemically inert
B. sufficiently strong
C. hard and durable
D. all the above.
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Correct Answer: all the above.
5. Expansion joints are provided if the length of concrete structures exceeds
Options
A. 10 m
B. 15 m
C. 15 m
D. 35 m
E. 45 m
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Correct Answer: 45 m
6. Pozzolanic properties exist in
Options
A. shales
B. fly ash
C. pumicite
D. diatomaceous clay
E. all the above.
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Correct Answer: all the above.
7. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
Options
A. 20.5 mm
B. 30.5 mm
C. 40.5 mm
D. 50.5 mm
E. none of these.
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Correct Answer: 40.5 mm
8. Workability improved by adding
Options
A. fly ash
B. hydrated lime
C. calcium chloride
D. bentonite
E. all the above.
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Correct Answer: all the above.
9. The dimensions of a 35 litre forma for measuring aggregates by volume, are :
Options
A. length 30 cm, breadth 25 cm, height 30 cm
B. length 39 cm, breadth 25 cm, height 32 cm
C. length 27 cm, breadth 27 cm, height 48 cm
D. length 220 cm, breadth 25 cm, height 40 cm
E. none of these.
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Correct Answer: length 27 cm, breadth 27 cm, height 48 cm
10. For the construction of thin R.C.C. structures, the type of cement to be avoided, is
Options
A. ordinary Portland cement
B. rapid hardening cement
C. low heat cement
D. blast furnace slag cement
E. sulphate resisting cement.
Show Answer
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Correct Answer: blast furnace slag cement
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