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Concrete Technology
Comments
Question
The condition not applicable to water cement ratio law, is
Options
A. internal moisture conditions on hydration continue till complete strength is gained
B. concrete specimens may be tested at any temperature
C. concrete specimens need be of same age
D. concrete specimens need be of same size
E. none of these.
Correct Answer
concrete specimens may be tested at any temperature
Concrete Technology problems
Search Results
1. The void ratio of
Options
A. single size coarse aggregate is roughly 0.45.
B. graded coarse aggregate is roughly 0.040
C. fine aggregate is roughly 0.45
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
2. Slump test of concrete is a measure ofits
Options
A. consistency
B. compressive strength
C. tensile strength
D. impact value.
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Correct Answer: consistency
3. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is
Options
A. 1 : 3 : 6
B. 1 :
: 3
C. 1 : 2 : 4
D. 1 : 1 : 2
E. 1 : 4 : 8.
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Correct Answer: 1 : 2 : 4
4. Pick up the correct statement from the following:
Options
A. Calcium chloride acts as a retarder
B. Gypsum (calcium sulphate) acts as an accelerator
C. Gypsum (calcium sulphate) acts as a retarder
D. Calcium chloride acts as an accelerator
E. Both (c) and (d).
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Correct Answer: Both (c) and (d).
5. Pick up the correct statement from the following:
Options
A. High percentage of C
3
S and low percentage of C
2
S cause rapid hardening
B. High percentage of C
3
S and low percentage of C
2
S make the cement less resistive to chemical attack
C. Low percentage of C
3
S and high percentage of C
2
S contribute to slow hardening
D. Low percentage of C
3
S and high percentage of C
2
S provide greater resistance to chemical attack
E. All the above.
Show Answer
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Correct Answer: All the above.
6. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is
Options
A. rounded aggregate
B. irregular aggregate
C. angular aggregate
D. flaky aggregate
E. none of these.
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Correct Answer: rounded aggregate
7. Pick up the incorrect statement from the following:
Options
A. In properly graded aggregates, bulk density is more
B. In single size aggregates, bulk density is least
C. In single size aggregates, bulk density is maximum
D. None of these.
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Correct Answer: In single size aggregates, bulk density is maximum
8. For preparing a test-specimen, it is necessary
Options
A. to mix cement and fine aggregate by dry hand
B. to mix coarse aggregates
C. to mix water to the cement, fine aggregates and coarse aggregates
D. to oil inner surface of the mould and the base plate, before placing concrete
E. all the above.
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Correct Answer: all the above.
9. High temperature
Options
A. increases the strength of concrete
B. decreases the strength of concrete
C. has no effect on the strength of concrete
D. none of these.
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Correct Answer: decreases the strength of concrete
10. The type of aggregates of same nominal size, which contain less voids when compacted, are
Options
A. rounded spherical
B. irregular
C. flaky
D. none of these.
Show Answer
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Correct Answer: rounded spherical
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