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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

34 liters
30 liters
32 liters
28 liters

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Concrete Technology and Design of Concrete Structures
A higher modular ratio shows

higher compressive strength of con-crete
higher tensile strength of steel
lower compressive strength of concrete
lower tensile strength of steel

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Concrete Technology and Design of Concrete Structures
The strength of concrete after one year as compared to 28 days strength is about

15 to 20% more
25 to 50% more
10 to 15% more
20 to 25% more

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Concrete Technology and Design of Concrete Structures
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

tcr – rcs = tct
fc5>fcr>fC
fcr>fcs>fc.
fcr

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Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

the effects of temperature variations
workability
strength
the unit weight

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Concrete Technology and Design of Concrete Structures
Workability of concrete is inversely proportional to

vater-cement ratio
time of transit
the air in the mix
size of aggregate

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