Directly proportional to compressive strength
Inversely proportional to compressive strength
Directly proportional to square root of compressive strength
Inversely proportional to square root of compressive strength
C. Directly proportional to square root of compressive strength
l/3
l/5
l/7
l/10
Shales
Fly ash
Pumicite
All the above
Dry
Earth moist
Semi-plastic
Plastic
20 mm particles
10 mm particles
4.75 mm particles
All the above
Compressive and tensile
Tensile and compressive
Both compressive
Both tensile
Water cement ratio is reduced
Proportion of aggregates is reduced
An allowance for the entrained air is made
All the above
100 kg
110 kg
120 kg
130 kg
Nala beds
River beds
Sea beds
None of these
2 %
4 %
6 %
8 %
10 cm, 20 cm, 30 cm
10 cm, 30 cm, 20 cm
20 cm, 10 cm, 30 cm
20 cm, 30 cm, 10 cm
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
0
10
20
30
Floating
Screeding
Trowelling
Finishing
Rounded spherical
Irregular
Flaky
None of these
1 : 1 : 2
1 : 2 : 4
1 : 3 : 6
1 : 4 : 10
2.5 cm
5.0 cm
7.5 cm
10 cm
Bleeding
Creeping
Segregation
Shrinkage
Water
Cement
Aggregate
None of these
Wholly parabolic
Wholly rectangular
Parabolic above neutral axis and rectangular below neutral axis
Rectangular above neutral axis and parabolic below neutral axis
Volume stability
Strength
Water resistance
All the above
70 litres of sand and 120 litres of aggregates
70 kg of sand and 140 litres of aggregates
105 litres of sand and 140 litres of aggregates
105 litres of sand and 210 litres of aggregates
Reduction in permeability
Loss of heat of hydration
Reduction in bleeding
All the above
A highly absorptive aggregate reduces the workability of concrete considerably
The specific gravity of aggregate is important for the determination of the moisture content
The absorption and porosity of an aggregate influence the property of the concrete
All the above
Internal vibrator
Screed vibrator
Form vibrator
None of these
Aggregates should be hard and durable
Water should be free from organic materials
Cement should be sufficient to produce the required strength
All the above
The quality of water governs the strength of concrete
10% excess of water reduces the strength of concrete by 15%
30% excess of water reduces the strength of concrete by 50%
All the above
The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
The total water is the free water and the amount actually absorbed by the aggregates
Neither (a) nor (b)
Both (a) and (b)
8 kg
10 kg
12 kg
14 kg
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
Sand stones may be divided into calcareous, siliceous and ferruginous sand stones
Concrete using sand stones, cracks due to excessive shrinkage
Broken bricks produce a concrete having good fire resisting qualities
All the above