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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Strength of concrete increases with

increase in fineness of cement
decrease in size of aggregate
increase in water-cement ratio
decrease in curing time

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Concrete Technology and Design of Concrete Structures
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

40 mm
45mm
60 mm
50 mm

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Concrete Technology and Design of Concrete Structures
As compared to ordinary portland cement, use of pozzuolanic cement

reduces workability
increases bleeding
increases shrinkage
increases strength

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Concrete Technology and Design of Concrete Structures
Select the incorrect statement for ...

None of these
Lean mixes bleed more as compared to rich ones.
Bleeding can be minimized by adding pozzuolana finer aggregate.
Bleeding can be increased by addition of calcium chloride.

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Concrete Technology and Design of Concrete Structures
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.40 d
0.45 d
dependent on grade of concrete also
0.35 d

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Concrete Technology and Design of Concrete Structures
For the design of retaining walls, the minimum factor of safety against overturning is taken as

2.5
3
1.5
2

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