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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

increases with richer mixes
decreases with richer mixes
remains constant
None of these

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Concrete Technology and Design of Concrete Structures
For walls, columns and vertical faces of all structural members, the form work is generally removed after

3 days
24 to 48 hours
7 days
14 days

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Concrete Technology and Design of Concrete Structures
Most common method of prestressing used for factory production is

Magnel-Blaton system
Long line method
Lee-Macall system
Freyssinet system

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Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

15%
20%
5%
10%

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Concrete Technology and Design of Concrete Structures
If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are

1.5 m and 3.0 m
3.0 m and 3.0 m
3.0 m and 1.5 m
1.5 m and 1.5 m

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Concrete Technology and Design of Concrete Structures
For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

Above 0.92
0.85 - 0.92
0.75 - 0.80
0.75 - 0.80

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