The concrete is deemed not to comply with the strength requirements if the stren

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Question
The concrete is deemed not to comply with the strength requirements if the strength is less than the greater of
Options
A. characteristic strength minus 1.35 times the standard deviation
B. 0.8 times the characteristic strength
C. the average strength of all the samples is less than the characteristic strength plus times the standard deviation.
D. all the above.

Correct Answer

all the above.

Structural Design Specifications problems

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1. For heavily reinforced concrete member, the nominal maximum size of the aggregates should be restricted to
Options
A. 5 mm less than the minimum clear distance between the main bars
B. 5 mm less than the minimum cover to the reinforcement
C. smaller of (a) and (b)
D. greater of (a) and (b)

3. The minimum pitch i.e., the distance between centres of rivet holes is not less than
Options
A. 1.5 times the hole diameter
B. 2.0 times the hole diameter
C. 2.5 times the hole diameter
D. 3.0 times the hole diameter
E. None of these.

4. If D is the overall thickness of the slab, the diameter of the reinforcing bars should not exceed
Options
A.
B.
C.
D.
E.

10. The depth 'd' of webs without horizontal stiffeners and consisting of tongue plates is taken lesser than the depth of the girder between the flanges less the sum of the depth of the tongue plates, and
Options
A. eight times the sum of the thickness of tongue plates
B. six times the sum of the thickness of tongue plates
C. four times the sum of the thickness of tongue plates
D. None of the above.

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