Gypsum
Hydrogen peroxide
Calcium chloride
Sodium oxide
A. Gypsum
4.5
5.5
6.5
7.5
Compressive everywhere
Tensile everywhere
Partly compressive and partly tensile
Zero
6 mm
8 mm
12 mm
16 mm
Water cement ratio
Workability
Grading of aggregate
Fineness modulus
Segregation is necessary for a workable concrete
Consistency does not affect the workability of concrete
If the concrete mix is dry, the slump is maximum
None of these
Rounded aggregate
Irregular aggregate
Angular aggregate
Flaky aggregate
30 %
40 %
50 %
60 %
M 100
M 200
M 300
M 500
Contraction joint
Expansion joint
Construction joint
Both (a) and (b)
fcr - fcs = fcl
fcr > fcs > fcl
fcr < fcs < fcl
fcs > fcr > fcl
Magnesium oxide
Iron oxide
Alumina
Lime
To mix cement and fine aggregate by dry hand
To mix coarse aggregates
To mix water to the cement, fine aggregates and coarse aggregates
All the above
2 %
4 %
6 %
10 %
Less
More
Equal
None of the above
Nala beds
River beds
Sea beds
None of these
Between 150 to 300 kg/cm2
Between 350 to 600 kg/cm2
Between 150 to 500 kg/cm2
Below 200 kg/cm2
2
4
6
8
0.1P + 0.3Y + 0.1Z = W/C × P
0.3P + 0.1Y + 0.01Z = W/C × P
0.4P + 0.2Y + 0.01Z = W/C × P
0.5P + 0.3Y + 0.01Z = W/C × P
Tricalcium silicate and dicalcium silicate
Dicalcium silicate and tricalcium aluminate
Tricalcium aluminate and tricalcium alumino ferrite
All the above
Water cement paste hardens due to hydration
During hardening cement binds the aggregates together
Cement provides strength, durability and water tightness to the concrete
All the above
The loss of pre-stress is more in pre-tensioning system than in posttensioning system.
Pre-tensioning system has greater certainty about its durability.
For heavy loads and large spans in buildings or bridges, posttensioning system is cheaper than pre-tensioning system
None of the above
5 % less
10 % less
5 % more
10 % more
Zero
Tensile
Compressive
Tensile or compressive
Where B.M. and S.F. are small
Where the member is supported by other member
At 18 m apart in huge structures
All the above
3.5 m
4 m
4.5 m
5 m
There will be no settlement of columns
There will be no differential settlement
The settlement of exterior columns will be more than interior columns
The settlement of interior columns will be more than exterior columns
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
Single size coarse aggregate is roughly 0.45
Graded coarse aggregate is roughly 0.040
Fine aggregate is roughly 0.45
All the above
Insufficient quantity of water makes the concrete mix harsh
Insufficient quantity of water makes the concrete unworkable
Excess quantity of water makes the concrete segregated
All the above
Water cement ratio is reduced
Proportion of aggregates is reduced
An allowance for the entrained air is made
All the above