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WorksheetsCivilwar-Day 39-PWD-Hardened concrete&admixtures
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Compressive strength of concrete using cylinder specimen = ____ × compressive strength using cube specimen
a)
1
b)
0.8
c)
0.6
d)
0.5
2.
If the side of a concrete cube is reduced from 15 cm to 5 cm, the test results:
a)
Are likely to be the same
b)
Will give increased strength
c)
Will give decreased strength
d)
None of these
3.
Shrinkage in concrete increases with
a)
Increase in water content
b)
Increase in temperature
c)
Increase in cement content
d)
All of these
4.
Creep ___ as the age of application of load ___
a)
increase, increase
b)
has no change, decrease
c)
decrease, decrease
d)
decrease, increase
5.
For a given aggregate ratio, increasing the water–cement ratio
a)
Increases bond strength
b)
Increases shrinkage
c)
Increases strength
d)
Does not cause any change
6.
The increase in the strength of concrete with time is
a)
Linear
b)
Non-linear
c)
Asymptotic
d)
Parabolic
7.
Admixtures used in cold weather climate
a)
Accelerator
b)
Plasticizer
c)
Retarder
d)
All of these
8.
The entrained air in concrete
a)
increases workability
b)
decreases workability
c)
increases strength
d)
does not affect workability
9.
Which admixture is preferred when concrete has to be pumped?
a)
Super plasticizers
b)
Plasticizers
c)
Accelerators
d)
Retarders
10.
Choose the incorrect statement
a)
Admixtures could be used to accelerate initial setting time of concrete
b)
Addition of pozzolana admixture increases heat of hydration
c)
Presence of algae in concrete reduces the strength
d)
Rounded aggregates are more workable
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