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Concrete Technology
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Question
Pick up the correct statement from the following:
Options
A. The concrete gains strength due to hydration of cement
B. The concrete cured at a temperature below 23°C, gains strength up to 28 days
C. The concrete does not set at freezing point
D. The strength of concrete increases with its age
E. All the above.
Correct Answer
All the above.
Concrete Technology problems
Search Results
1. 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
2. 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.
Show Answer
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Correct Answer: length 27 cm, breadth 27 cm, height 48 cm
3. 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.
4. 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
5. 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.
6. Concrete gains strength due to
Options
A. chemical reaction of cement with sand and coarse aggregates
B. evaporation of water from concrete
C. hydration of cement
D. All the above.
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Correct Answer: hydration of cement
7. If the slump of a concrete mix is 60 mm, its workability is
Options
A. very low
B. low
C. medium
D. high
E. none of these.
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Correct Answer: medium
8. Water cement ratio is generally expressed in volume of water required per
Options
A. 10 kg
B. 20 kg
C. 30 kg
D. 40 kg
E. 50 kg
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Correct Answer: 50 kg
9. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
Options
A. 20 times
B. 25 times
C. 30 times
D. 40 times
E. 50 times
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Correct Answer: 25 times
10. Pick up the correct statement from the following:
Options
A. Sand obtained from pits, is washed to remove clay and silt
B. Sand obtained from flooded pits, need not be washed before use
C. Sea shore sand contains chlorides which cause effloresance
D. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
E. All the above.
Show Answer
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Correct Answer: All the above.
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