Porous
Non-homogeneous
Reduced strength
All the above
D. All the above
(i) and (ii),
(ii) and (iii)
(i) and (iv)
(iii) and (iv)
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
Water enables chemical reaction to take place with cement
Water lubricates the mixture of gravel, sand and cement
Strength of concrete structure largely depends upon its workability
All the above
Insufficient quantity of water makes the concrete mix harsh
Insufficient quantity of water makes the concrete unworkable
Excess quantity of water makes the concrete segregated
All the above
Thorough mixing of concrete is required
Proper compaction of concrete is required
Proper curing of concrete is required
All the above
Water cement ratio
Workability
Grading of aggregate
Fineness modulus
1.5
2.0
2.5
3.0
Sand stone
Slate
Lime stone
Graphite
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
High percentage of C3S and low percentage of C2S cause rapid hardening
High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
Low percentage of C3S and high percentage of C2S contribute to slow hardening
All the above
Membrane method
Ponding method
Covering surface with bags
Sprinkling water method
35 MPa and 42 MPa
42 MPa and 35 MPa
42 MPa and 53 MPa
53 MPa and 42 MPa
Between 150 to 300 kg/cm2
Between 350 to 600 kg/cm2
Between 150 to 500 kg/cm2
Below 200 kg/cm2
Remains constant
Increases with richer mixes
Decreases with richer mixes
None of the above
Made with cement concrete
Thick and reinforced
Thin and heavily reinforced
Thick and heavily reinforced
Colorcrete
Silvicrete
Snowcem
All the above
Aggregates
Cement
Water
All the above
Moist aggregates
Very dry aggregates
Dry aggregates
Saturated surface dry aggregate
5% of the total aggregates for low workability with a coarse grading
10% of the total aggregates for low workability with a fine grading
20% of the total aggregates for a mix having high workability with fine grading
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
0.15% to 2%
0.8% to 4%
0.8% to 6%
0.8% to 8%
Tonnes/cubic metre
kg/cubic metre
kg/litre
g/cm3
Fineness test
Consistency test
Test for setting time
Test for tensile strength
To decrease it
To increase it
Either to decrease or to increase it
To keep it unchanged
Single sized aggregates
Two sized aggregate
Graded aggregates
Coarse aggregates
Upper part of the beam
Lower part of the beam
Center
Anywhere
Ordinary Portland cement
Rapid hardening cement
Low heat cement
Blast furnace slag cement
Size and shape of aggregates
Specific gravity of aggregates
Grading of aggregates
Size and shape of the container
Magnesium oxide
Iron oxide
Alumina
Lime
10 to 15% more
15 to 20% more
20 to 25% more
25 to 50% more