1.1 Normal-weight concrete with a maximum aggregate size of 1/2 in., fe 4,000 ps

Question

1.1 Normal-weight concrete with a maximum aggregate size of 1/2 in., fe 4,000 psi has limited exposure to freezing and thawing (Class F1). The recommended air content per Table 19.3.3.1 of AC1318-14 is most nearly (6 points): (A) 4.5% (B) 5.0% (C) 5.5% (D) 6.0% 1.2 Which of the following characterizes the typical failure of an over-reinforced concrete beam that has a reinforcement ratio higher than the balanced ratio (6 points)? (A) The steel yields, and large deflections and tensile cracks will be observed prior to failure. (B) The concrete crushes, and large deflections and tensile cracks will be observed prior to failure. (C) The steel yields, and the beam fails suddenly without warning (D) The concrete crushes, and the beam fails suddenly without warning

Explanation / Answer

1.1 option D

1.2 its option D.

if it is under-reinforced section tension cracks will appear first,later failure occur.

but incase of over-reinforced concrete, concrete fails without any waring showing cracks

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