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For the following questions answer them individually
On a grading curve, the gap grading is represented by
a horizontal line
a vertical line
North West inclined line
None of these
To obtain a very high strength concrete, use very fine grained
Granite
Magnetite
Barite
Volcanic scoria
The bulk density of aggregates is generally expressed as
tonnes/cubic meter
kg/cubic meter
kg/litre
Addition of pozzolana to ordinary Portland cement causes
decrease in early strength
reduction in chemical action with sulphates
increase in shrinkage
All option are correct
Using the largest maximum size of aggregate in concrete reduces
the cement content
water requirement
drying shrinkage
Sea water:
contains a salinity of about 3.5 percent
corrodes the reinforcement of R.C.C.
accelerates the setting time of cement
In fineness test of rapid hardening Portland cement the residue on IS sieve No. 9,should not be more than
0.01
0.05
0.1
0.15
Identify the correct statements.
White cement is unsuitable for ordinary work.
Pozzolana cement is grey in colour
C3S is tricalcium silicate
Strength of cement should not be disturbed until it is to be used
In a singly reinforced beam
compression is borne entirely by concrete
steel possesses initial stresses when embedded in concrete
plane sections transverse to the center line of the beam before bending remain plane afterbending
If the depth of actual neutral axis of a doubly reinforced beam
is greater than the depth of critical neutral axis, the concrete attains its maximum stressearlier
is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximumstress earlier
is equal to the depth of critical neutral axis, the concrete and steel attain their maximumstresses simultaneously
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