Rounded
Elongated
Angular
All of the above
A. Rounded
24 to 48 hours
3 days
7 days
14 days
Lime stone and clay
Gypsum and lime
Pozzolana
Lime, pozzolana and clay
Size and shape of aggregates
Specific gravity of aggregates
Grading of aggregates
Size and shape of the container
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
Cement and standard sand mortar are used in the ratio of 1 : 3
Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency
A cube mould of 10 cm × 10 cm × 10 cm is used
The prepared moulds are kept in a atmosphere of 50% relative humidity
Shales
Fly ash
Pumicite
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
10 cm
15 cm
20 cm
25 cm
20 %
25 %
30 %
35 %
0.75 - 0.80
0.80 - 0.85
0.85 - 0.92
Above 0.92
2
4
6
8
Single sized aggregates
Two sized aggregate
Graded aggregates
Coarse aggregates
Reduces the strength
Increases the strength
Does not change the strength
All of the above
100 kg
110 kg
120 kg
130 kg
10 to 15% more
15 to 20% more
20 to 25% more
25 to 50% more
Screeding
Floating
Trowelling
Finishing
Full capacity of the ware house
Pressure exertion of the bags of upper layers
Pressure compaction of the bags on lower layers
Packing the ware house
1 : 2 : 4
1 : 3 : 6
1 : 1 ½ : 3
1 : 1 : 2
0.1P + 0.3Y + 0.1Z = W/C × P
0.3P + 0.1Y + 0.01Z = W/C × P
0.4P + 0.2Y + 0.01Z = W/C × P
0.5P + 0.3Y + 0.01Z = W/C × P
Weight 50 kg
Height 18 cm
Plan area 3000 sq. cm
All the above
wR / 4d
wR/2d
wR/d
2wR/d Where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome
Residual does not exceed 10% when sieved through IS Sieve No. 9
Soundness varies from 5 to 10 mm
Initial setting time is not less than 30 minutes
Compressive stress after 7 days, is not less than 175 kg/cm2
20 times
25 times
30 times
50 times
Moist aggregates
Very dry aggregates
Dry aggregates
Saturated surface dry aggregate
2 %
4 %
6 %
10 %
Hydrates rapidly
Generates less heat of hydration
Hardens rapidly
Provides less ultimate strength to cement
Increases the strength of concrete
Decreases the strength of concrete
Has no effect on the strength of concrete
None of these
Balanced beam
Under-reinforced beam
Over-reinforced beam
None of the above
Higher compressive strength of concrete
Lower compressive strength of concrete
Higher tensile strength of steel
Lower tensile strength of steel
10 %
20 %
30 %
40 %