Increasing the depth of beam
Using thinner bars but more in number
Using thicker bars but less in number
Providing vertical stirrups
B. Using thinner bars but more in number
Concrete for which preliminary tests are conducted, is called controlled concrete
Bulking of sand depends upon the fineness of grains
Concrete mix 1 : 6 : 12, is used for mass concrete in piers
All the above
Reacts fast with water
Generates less heat of hydration
Causes initial setting and early strength of cement
Does not contribute to develop ultimate strength
Water content and its temperature
Shape and size of the aggregates
Air entraining agents
All the above
Reduction in permeability
Loss of heat of hydration
Reduction in bleeding
All the above
Top face perpendicular to wall
Bottom face perpendicular to wall
Both top and bottom faces perpendicular to wall
None of the above
High percentage of C3S and low percentage of C2S cause rapid hardening
High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
Low percentage of C3S and high percentage of C2S contribute to slow hardening
All the above
M 100
M 150
M 250
M 400
25 %
40 %
60 %
80 %
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
0
10
20
30
1.5
2.0
2.5
3.0
Alumina
Iron oxide
Silica
Alkalis
Increasing the depth
Providing shear reinforcement
Using high strength steel
Using thinner bars but more in number
Screeding
Floating
Trowelling
Finishing
Chemical reaction of cement with sand and coarse aggregates
Evaporation of water from concrete
Hydration of cement
All the above
3 days
7 days
21 days
28 days
The weight of ingredients of concrete mix, is taken in kilograms
Water and aggregates are measured in litres
20 bags of cement make one tonne
All the above
Increases the strength of concrete
Decreases the strength of concrete
Has no effect on the strength of concrete
None of these
Higher workability indicates unexpected increase in the moisture content
Higher workability indicates deficiency of sand
If the concrete mix is dry, the slump is zero
All the above
The concrete gains strength due to hydration of cement
The concrete does not set at freezing point
The strength of concrete increases with its age
All the above
Thin particles
Flat particles
Elongated particles
All the above
4.75 mm
30 mm
60 mm
75 mm
100 kg/cm2
150 kg/cm2
200 kg/cm2
250 kg/cm2
1.5 and 2.2
2.2 and 1.5
1.5 and 1.5
2.2 and 2.2
To provide adequate bond stress
To resist tensile stresses
To impart initial compressive stress in concrete
All of the above
Continuous grading is not necessary for obtaining a minimum of air voids
The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
All the above
Steel and concrete are same
Steel is lower than that for concrete
Steel is higher than that for concrete
None of the above
At the middle of the wall
At the edge of the wall
Halfway between the middle and edge of the wall
At a distance equal to effective depth of footing from the edge of the wall
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
Equal to the mean size
Twice the mean size
Thrice the mean size
Four times the mean size