Single size coarse aggregate is roughly 0.45
Graded coarse aggregate is roughly 0.040
Fine aggregate is roughly 0.45
All the above
D. All the above
Building concrete is less than 45
Road pavement concrete is less than 30
Runway concrete is less than 30
All the above
Construction joints in columns are provided a few cm below the junction of beam
Construction joints in columns are provided at the bottom hunching
Construction joints in beams and slabs are provided within middle third
All the above
3 days
7 days
21 days
28 days
Less than 12
Less than 18
Between 18 and 24
More than 24
Is proportional to water content is the mix
Is proportional to cement concrete
Increases with age of concrete
All the above
(i) and (ii)
(i)and(iv)
(ii) and (iii)
(iii) and (iv)
100 kg/cm2
150 kg/cm2
200 kg/cm2
300 kg/cm2
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
Economy
Durability
Workability
All the above
Water content and its temperature
Shape and size of the aggregates
Air entraining agents
All the above
Reduces the strength
Increases the strength
Does not change the strength
All of the above
Shear strength
Tensile strength
Compressive strength
None of these
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
1.5
2.0
2.5
3.0
100 kg/cm2
150 kg/cm2
200 kg/cm2
250 kg/cm2
24 to 48 hours
3 days
7 days
14 days
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
The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt
All the above
20 mm to 30 mm
30 mm to 40 mm
40 mm to 50 mm
50 mm to 60 mm
1.5 and 2.2
2.2 and 1.5
1.5 and 1.5
2.2 and 2.2
30 %
40 %
50 %
60 %
One cantilever
Two cantilevers
Three cantilevers
Four cantilevers
Deflect downward
Deflect upward
Deflect downward or upward
None of the above
Segregation
Internal friction
Hardness
Bleeding
Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3
Cement should be mixed for at least one minute
10% of water is placed in the rotating drum before adding dry material
10% of water is added after placing the other ingredients in the drum
All the above
Rapid rate during the first few days and afterwards it continues to increase at a decreased rate
Slow rate during the first few days and afterwards it continues to increase at a rapid rate
Uniform rate throughout its age
None of these
Lean mixes bleed more as compared to rich ones.
Bleeding can be minimized by adding pozzolana finer aggregate
Bleeding can be increased by addition 'of calcium chloride
None of the above
2/3 mean dimension
3/4 mean dimension
3/5 mean dimension
5/8 mean dimension
Greatest surface area for the given cement and aggregates
Least surface area for the given cement and aggregates
Least weight for the given cement and aggregates
Greatest weight for the given cement and aggregates