20.5 mm
30.5 mm
40.5 mm
50.5 mm
C. 40.5 mm
Very fine sand
Fine sand
Medium sand
Coarse sand
Segregation
Bleeding
Bulking
Creep
Has strength less than 10% to 15%
Has more resistance to weathering
Is more plastic and workable
Is free from segregation and bleeding
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
Less than 1
Between 1 and 1.5
Between 1.5 and 2.0
Greater than 2
10 %
20 %
30 %
40 %
Front face only
Inner face only
Both front face and inner face
None of the above
4.75 mm
30 mm
60 mm
75 mm
Decrease in early strength
Reduction in chemical action with sulphates
Increase in shrinkage
All the above
Reduction in permeability
Loss of heat of hydration
Reduction in bleeding
All the above
Deflect downward
Deflect upward
Deflect downward or upward
None of the above
Admixtures accelerate hydration
Admixtures make concrete water proof
Admixtures make concrete acid proof
Admixtures give high strength
Is proportional to water content is the mix
Is proportional to cement concrete
Increases with age of concrete
All the above
Bleeding
Creeping
Segregation
Shrinkage
Internal moisture conditions on hydration continue till complete strength is gained
Concrete specimens may be tested at any temperature
Concrete specimens need be of same age
Concrete specimens need be of same size
Decrease in tensile strength but increase in ductility
Increase in tensile strength but decrease in ductility
Decrease in both tensile strength and ductility
Increase in both tensile strength and ductility
2.75 mm
3.00 mm
3.75 mm
4.75 mm
Air-entraining agent
Foaming agent
Oily-agent
All the above
Voids in coarse aggregates are filled by fine aggregates
Voids in fine aggregates are filled by the cement paste
Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
All the above
Lime stone and clay
Gypsum and lime
Pozzolana
Lime, pozzolana and clay
Less than 1
Between 1 and 1.5
Between 1.5 and 2
Greater than 2
Calcium chloride acts as a retarder
Calcium chloride acts as an accelerator
Gypsum (calcium sulphate) acts as a retarder
Both (b) and (c)
1100° and 1200°C
1200° and 1300°C
1300° and 1400°C
1400° and 1500°C
Smaller creep and shrinkage
Greater density and smaller permeability
Improved frost resistance
All the above
20 m
30 m
45 m
60 m
Reduces the strength
Increases the strength
Does not change the strength
All of the above
0.367 xu
0.416 xu
0.446 xu
0.573 xu
Dry
Earth moist
Semi-plastic
Plastic
Setting time
Tensile strength
Consistency
All the above
10 kg
20 kg
30 kg
50 kg