Question 1

Explain what concrete cover is in reinforced concrete components and why it is necessary.

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Question 2

What is concrete formwork? Which materials are commonly used for the formwork?

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Question 3

The most important reason for providing ties in a concrete wall is to

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A) prevent the buckling of longitudinal bars in the wall. 
B) increase the compressive strength of the wall. 
C) allow the formwork to be tied to the longitudinal bars in the wall. 
D) increase the shear strength of the wall. 
E) Ties are generally not provided in a concrete wall.

Question 4

What is a lap splice in steel bars and why is it required?

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Question 5

Explain what the following terms mean: plain concrete, reinforced concrete, and prestressed concrete.

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Question 6

If a concrete member is not subjected to tensile stresses created by the loads, such as a slab on a firm base (ground), does it still need steel reinforcement?

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Question 7

Concrete reinforcing bars come in limited lengths. Explain how we ensure their continuity in a long structural element, such as a column in a high- rise building or a long, continuous beam.

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Question 8

Why should the control joints in a concrete slab- on- ground be provided as soon as possible?

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Question 9

Which material is used for vapor retarder under a concrete slab- on- ground?

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Question 10

What function do ties serve in a reinforced concrete column?

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Question 11

Explain how control joints in a concrete slab- on- ground are provided.

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Question 12

Hooks are used

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A) where the lap- splice length is excessive. 
B) where lap splicing of bars will produce excessive congestion. 
C) to lap splice reinforcing bars. 
D) all of the above. 
E) none of the above.

Question 13

Mechanical couplers are used

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A) where the lap- splice length of reinforcing bars is excessive. 
B) to lap splice reinforcing bars. 
C) as an economical alternative to lap splicing of reinforcing bars. 
D) where lap splicing of reinforcing bars will produce excessive congestion. 
E) none of the above.

Question 14

What is the function of stirrups? Sketch commonly used open- loop and closed- loop stirrups.

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Question 15

The chairs used to support reinforcing steel bars are generally

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A) steel chairs with plastic- coated feet. 
B) steel- encased plastic chairs. 
C) plastic chairs. 
D) A and B. 
E) A and C.

Question 16

If a concrete member is not a precast concrete member, can it prestressed? Explain.

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Question 17

Explain what pretensioning of concrete is.

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Question 18

Is concrete cover required in concrete foundations although a foundation is not exposed to the outside environment?

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Question 19

When a strand is tensioned (pulled), is it pulled from the dead end or live end?

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Question 20

What is the function of a vapor retarder under a concrete slab- on- ground?

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Exam 22: Concrete Construction-I Formwork, Reinforcement, and Slabs-On-Ground