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For the following questions answer them individually
Concrete mainly consists of
cement
aggregates
admixture
All option are correct
A concrete using an air entrained cement
has strength less than 10% to 15%
has more resistance to weathering
is more plastic and workable
is free from segregation and bleeding
of keeping concrete wet to enable it to attain full strength is known as:-
curing
wetting
drenching
quenching
Segregation is responsible for
honey- combed concrete
porous layers in concrete
surface scaling in concrete
$$W_p$$ and $$W_f$$ are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor ($$W_p$$/$$W_f$$ ) is 0.95, the workability of concrete is
extremely low
very low
low
high
The process of hardening the concrete by keeping its surface moist is known
placing
compacting
Pick up the correct statement from the following
There should not be any loss of cement from the charged drum of the mixer
Cement should be mixed for at least one minute
10% of water is placed in the rotating drum before adding dry material
The final operation of finishing floors is known as
floating
finishing
troweling
Expansion joints are provided if the length of concrete structures exceeds
10 m
15 m
25 m
45 m
A flaky aggregate is said to be elongated if its length is
equal to the mean size
twice the mean size
thrice the mean size
four times the mean size
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