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Concrete Technology
Comments
Question
Concrete containing
Options
A. silicious aggregates, has higher co-efficient of expansion
B. igneous aggregates, has intermediate coefficient of expansion
C. lime stones, has lowest co-efficient of expansion
D. All the above.
Correct Answer
All the above.
Concrete Technology problems
Search Results
1. While designing an air entrained concrete
Options
A. water cement ratio is reduced
B. proportion of aggregates is reduced
C. an allowance for the entrained air is made
D. strength of the concrete, is reduced
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
2. Allowable shear strength of concrete, depends upon
Options
A. shear strength
B. tensile strength
C. compressive strength
D. none of these.
Show Answer
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Discuss
Correct Answer: shear strength
3. The diameter of the Vicat plunger is 10 mm and its length varies from
Options
A. 20 mm to 30 mm
B. 30 mm to 40 mm
C. 40 mm to 50 mm
D. 50 mm to 60 mm
E. none of these.
Show Answer
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Discuss
Correct Answer: 40 mm to 50 mm
4. The shrinkage of concrete
Options
A. is proportional to water content is the mix
B. is proportional to cement concrete
C. increases with age of concrete
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
5. Efflorescence in cement is caused due to an excess of
Options
A. alumina
B. iron oxide
C. silica
D. alkalis
E. magnesium oxide.
Show Answer
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Discuss
Correct Answer: alkalis
6. According to Water-Cement Ratio Law, the strength of workable plastic concrete
Options
A. depends upon the amount of water used in the mix
B. does not depend upon the quality of cement mixed with aggregates
C. does not depend upon the quanity of cement mixed with aggregates
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
7. The factor which affects workability, is
Options
A. water content and its temperature
B. shape and size of the aggregates
C. grading and surface textures of the aggregates
D. air entraining agents
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
8. To hydrate 500kg of cement full water needed, is
Options
A. 100 kg
B. 110 kg
C. 120 kg
D. 130 kg
E. 140 kg
Show Answer
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Discuss
Correct Answer: 130 kg
9. Pick up the incorrect statemnt from the following. For performing compressive strength test of cement
Options
A. cement and standard sand mortar are used in the ratio of 1 : 3
B. water is added at the rate of
+ 3.0 percentage of water where
P
is the percentage of water for standard consistency
C. A cube mould of 10 cm x 10 cm x 10 cm is used
D. The perpared moulds are kept in a atmosphere of 50% relative humidity
E. The temperature of water in the submerged tank for curing moulds, should be 27° ± 2°C.
Show Answer
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Discuss
Correct Answer: cement and standard sand mortar are used in the ratio of 1 : 3
10. To obtain a very high strength concrete, use very fine grained
Options
A. Granite
B. Magnetite
C. Barite
D. Volcanic scoria.
Show Answer
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Discuss
Correct Answer: Granite
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