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CONCRETE TECHNOLOGY QUIZ
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May 09, 2015
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CONCRETE TECHNOLOGY
Under normal conditions using an ordinary cement, the period of removal of the form work, is :
14 days for bottom slabs of spans 4.6 m and more
2 days for vertical sides of columns
21 days for bottom beams over 6 m spans
all the above.
After casting, an ordinary cement concrete on drying
expands
mix
shrinks
none of these.
Curing.
preserves the properties of concrete
prevents the loss of water by evaporation
reduces the shrinkage of concrete
all
The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary m
1 : 2 : 8
1 : 3 : 6
1 : 2 : 4
1 : 4 : 10
Hydration of cement is due to chemical action of water with
Dicalcium silicate and tricalcium aluminate
Tricalcium silicate and dicalcium silicate
Tricalcium aluminate and tricalcium alumino ferrite
ALL OF ABOVE
M10 grade of concrete approximates
1 : 2 : 4 mix
1 : 1 : 2 mix
1 : 3 : 6 mix
1 : 1.5 : 3 mix
The bulk density of aggregates does not depend upon :
size and shape of aggregates
grading of aggregates
specific gravity of aggregates
size and shape of the container
While compacting the concrete by a mechanical vibrator, the slump should not exceed
7.5 cm
5.0 cm
2.5 cm
10 cm
The risk of segregation is more for
larger proportion of maximum size aggregate
coarser grading
wetter mix
all of above
An aggregate is said to be flaky if its least dimension is less than
2/5th of mean dimension
3/5th of mean dimension
1/5th of mean dimension
4/5th of mean dimension
ANSWERS
1.D 2.C 3.D 4.D 5.D 6.C 7.D 8.B 9.D 10.B
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