Compressive and tensile
Tensile and compressive
Both compressive
Both tensile
B. Tensile and compressive
7 days
14 days
21 days
28 days
15 mm
25 mm
30 mm
40 mm
Soffit level
Window sill level
Floor level
All the above
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
Granite
Magnetite
Barite
Volcanic scoria
The least lateral dimension of the member
Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
Forty-eight times the diameter of transverse reinforcement
Lesser of the above three values
Affects only the early development of strength
Affects only the ultimate strength
Both (A) and (B)
Does not affect the strength
1 : 1 : 2
1 : 2 : 4
1 : 3 : 6
1 : 4 : 10
To decrease it
To increase it
Either to decrease or to increase it
To keep it unchanged
l/3
l/5
l/7
l/10
Internal vibrator
Screed vibrator
Form vibrator
None of these
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
0
10
20
30
Chemically inert
Sufficiently strong
Hard and durable
All the above
Calcium chloride acts as a retarder
Calcium chloride acts as an accelerator
Gypsum (calcium sulphate) acts as a retarder
Both (b) and (c)
10 %
12.5 %
15 %
18.5 %
Weakness of concrete
Excessive laitance
Segregation
All the above
Flexural tensile strength
Direct tensile strength
Compressive strength
Split tensile strength
23°C
0°
- 5.6°C
- 11.7°C
10 %
20 %
30 %
40 %
0.75 - 0.80
0.80 - 0.85
0.85 - 0.92
Above 0.92
600 mm
750 mm
900 mm
More than 1 m
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
Zero
Tensile
Compressive
Tensile or compressive
0.207 l
0.293 l
0.707 l
0.793 l From the driving end of pile which rests on the ground
Smaller creep and shrinkage
Greater density and smaller permeability
Improved frost resistance
All the above
7 kg
14 kg
21 kg
35 kg
Construction joints are necessarily planned for their locations
Expansion joints are provided to accommodate thermal expansion
Construction joints are provided to control shrinkage cracks
All the above
100 m
200 m
300 m
400 m
Less than 1
Between 1 and 1.5
Between 1.5 and 2
Greater than 2