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For the following questions answer them individually
Pick up the incorrect statement from the following
Admixtures accelerate hydration
Admixtures make concrete water proof
Admixtures make concrete acid proof
Admixtures give high strength
Pick up the correct statement from the following
Calcium chloride acts as a retarder
Gypsum (calcium sulphate) acts as an accelerator
Gypsum (calcium sulphate) acts as a retarder
None of these
High temperature
increases the strength of concrete
decreases the strength of concrete
has no effect on the strength of concrete
Reciprocal levelling eliminates:-
Collimation error
Collimation, curvature and refraction error
curvature and refraction error
curvature error fully and refraction error partly
Proper proportioning of concrete, ensures
desired strength and workability
desired durability
water tightness of the structure
All option are correct
Curing
reduces the shrinkage of concrete
preserves the properties of concrete
prevents the loss of water by evaporation
If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer (in litres) of 150-liter capacity is
15900
16900
17900
18900
The operation of removing humps and hollows of uniform concrete surface is known as
floating
screeding
troweling
finishing
According to the recommendations of IS: 456 - 1978, the expansion joints
are provided where plane changes abruptly
are provided to ensure minimum resistance
are supported on separate columns
An aggregate is said to be flaky if its least dimension is less than
1/5th of the mean dimension
2/5th of the mean dimension
3/5th of the mean dimension
4/5th of the mean dimension
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