Reinforced Concrete Practice Test 1

1. Beams, girders, or slabs supported by columns or walls shall not be cast or erected until concrete in the vertical support members is no longer plastic.

True

False

PG. 77, 6.4.6

Explanation

PG. 77, 6.4.6

2. In reference to cold weather requirements all concrete materials and all reinforcement, forms, fillers, and ground with which concrete is to come in contact shall be free from ______.

Ice

Heat

Water

Snow

During cold weather concreting, it is crucial to ensure that none of the materials involved, including reinforcement, forms, fillers, and ground, are coated with ice, frost, or snow. The presence of ice can severely affect the curing process of concrete, leading to weakened structures due to improper hydration of the cement. This is a standard requirement to maintain the integrity and strength of the concrete.

Explanation

During cold weather concreting, it is crucial to ensure that none of the materials involved, including reinforcement, forms, fillers, and ground, are coated with ice, frost, or snow. The presence of ice can severely affect the curing process of concrete, leading to weakened structures due to improper hydration of the cement. This is a standard requirement to maintain the integrity and strength of the concrete.

3. A standard hook has a ___ degree bend plus 12 d_b(bar diameters) extension at the free end of bar

180

90

45

30

PG. 79, 7.1.2

Explanation

PG. 79, 7.1.2

4. During hot weather, proper attention shall be given to ingredients, production methods, handling, placing, protection, and curing to prevent excessive concrete temperatures or water evaporation that could impair required _______ or serviceability of the member or structure.

Life

Strength

Durability

Aesthetics

PG. 72, 5.13

Explanation

PG. 72, 5.13

5. What is the minimum cover (in inches) for reinforcement in concrete cast against and permanently exposed to earth?

2

3

1

1/2

PG. 83, 7.7.1 (a)

Explanation

PG. 83, 7.7.1 (a)

6. For the strength level of an individual class of concrete to be considered satisfactory, no individual strength test can fall below f’_c by more than ______ psi when f’_c is 5000 psi or less.

500

100

1000

250

PG. 66, 5.6.3.3

Explanation

PG. 66, 5.6.3.3

7. Water shall be ______ from place of deposit before concrete is placed unless a ______ is to be used or unless otherwise permitted by the building official.

Removed, pump

Added, pump

Removed, tremie

Added, tremie

PG. 69, 5.7.1

Explanation

PG. 69, 5.7.1

8. Concrete in an area represented by core tests shall be considered structurally ________ if the average of three cores is equal to at least 85 percent of f’_c and if no single core is less than ______ percent of f’_c.

Adequate, 85

Adequate, 75

Inadequate, 75

Adequate, 85

PG. 68, 5.6.5.4

Explanation

PG. 68, 5.6.5.4

9. The minimum clear spacing between parallel bars in a layer shall be d_b, but not less than ______ inch.

1

1/2

3/4

1/4

PG. 82, 7.6.1

Explanation

PG. 82, 7.6.1

10. Samples for strength tests of each class of concrete placed each day shall be taken not less than once a day, nor less than once for each _______ cubic yards of concrete.

170

150

100

75

PG. 65, 5.6.2.1

Explanation

PG. 65, 5.6.2.1

11. Reinforcement partially embedded in concrete shall not be field _______, except as shown on the design drawings or permitted by the engineer.

Bent

Modified

Cut

Welded

PG. 80 7.3.2

Explanation

PG. 80 7.3.2

12. Conduits, pipes, and sleeves shall be permitted to be considered as replacing structurally in compression the displaced concrete provided they are of uncoated or galvanized iron or ______ not thinner than standard schedule 40 steel pipe.

Pvc

Steel

Aluminum

Tin

PG. 76, 6.3.6.2

Explanation

PG. 76, 6.3.6.2

13. Except for ________ steel, steel reinforcement with rust, mill scale, or a combination of both shall be considered satisfactory, provided the minimum dimensions (including height of deformations) and weight of a hand-wire-brushed test specimen comply with applicable ASTM specifications referenced in 3.5

Prestressing

Anchor bolt

Structural

Tie wire

PG. 80, 7.4.2

Explanation

PG. 80, 7.4.2

14. When total quantity of a given class of concrete is less than ________ cubic yards, strength tests are not required when evidence of satisfactory strength is submitted to and approved by the building official.

20

75

50

10

PG. 65, 5.6.2.3

Explanation

PG. 65, 5.6.2.3

15. Clear spacing between spirals shall not exceed ___ in., nor be less than ___ in.

1, 2

3,1

2,1

1,3

PG. 88, 7.10.4.3

Explanation

PG. 88, 7.10.4.3

16. A strength test shall be the average of the strengths of ________ 6 x 12 in. (150 x 300 mm) cylinders made from the same sample of concrete and tested at ____ days or at test age designated for determination of f'_c.

3, 28

1, 56

4, 56

2, 28

PG. 65, 5.6.2.4

Explanation

PG. 65, 5.6.2.4

17. For cast-in-place construction, size of spirals shall not be less than ____ in. diameter.

1/2

3/8

1/4

3/4

PG. 88, 7.10.4.2

Explanation

PG. 88, 7.10.4.2

18. All nonprestressed bars shall be enclosed by lateral ties, at least No. 3 in size for longitudinal bars No. ___ or smaller, and at least No. 4 in size for No. 11, No. 14, No. 18 and bundled longitudinal bars.

8

10

11

12

PG. 89, 7.10.5.1

Explanation

PG. 89, 7.10.5.1

19. For bundled bars, minimum concrete cover shall be equal to the equivalent diameter of the bundle, but need not be greater than ____ in.; except for concrete cast against and permanently exposed to earth, where minimum cover shall be 3 inches.

2

1

3/4

3

PG. 85, 7.7.4

Explanation

PG. 85, 7.7.4

20. Concrete (other than high-early strength) shall be maintained above _____ degrees F and in a moist condition for at least the first _____ days after placement, except when cured in accordance with 5.11.3

32, 2

40, 3

40, 7

50, 7

PG. 71, 5.11.1

Explanation

PG. 71, 5.11.1

21. In reference to removal of forms, shores, and reshoring, sufficient strength shall be demonstrated by ________ _________ considering proposed loads, strength of forming and shoring system, and concrete strength data.

Compressive strength

Construction schedule

Contractors math

Structural analysis

PG. 74, 6.2.2.1

Explanation

PG. 74, 6.2.2.1

22. What is the minimum cover (in inches) for primary reinforcement in a concrete beam not exposed to weather or in contact with the ground?

1 ½

2

1

3/4

PG. 84, 7.7.1 (c)

Explanation

PG. 84, 7.7.1 (c)

23. High-early-strength concrete shall be maintained above ______ degrees F and in a moist condition for at least the first ____ days, except when cured in accordance with 5.11.3

50, 3

50, 7

40, 7

40, 3

PG. 71, 5.11.2

Explanation

PG. 71, 5.11.2

24. Form supports for prestressed concrete members shall not be removed until sufficient ________ has been applied to enable prestressed members to carry their dead load and anticipated construction loads.

Prestressing

Post tensioning

Curing

Force

Form supports for prestressed concrete members should not be removed until sufficient prestressing has been applied. This is critical to ensure that the prestressed concrete members have attained the necessary strength to support their own weight (dead load) and any additional loads that might occur during construction. Prestressing involves applying forces to the concrete to strengthen it against future service loads, thus making it essential before the removal of supports to avoid structural failure.

Explanation

Form supports for prestressed concrete members should not be removed until sufficient prestressing has been applied. This is critical to ensure that the prestressed concrete members have attained the necessary strength to support their own weight (dead load) and any additional loads that might occur during construction. Prestressing involves applying forces to the concrete to strengthen it against future service loads, thus making it essential before the removal of supports to avoid structural failure.

25. Procedures for protecting and curing concrete shall be improved when strength of field-cured cylinders at test age designated for determination of f’_c is less than _____ percent of that of companion _________-cured cylinders.

90, field

50, field

75, laboratory

85, laboratory

PG. 67, 5.6.4.4

Explanation

PG. 67, 5.6.4.4

26. Tolerance for longitudinal location of bends and ends of reinforcement shall be +/- _____ inches

2

3

1

1/2

PG. 81, 7.5.2.2

Explanation

PG. 81, 7.5.2.2

27. In spirally reinforced or tied reinforced compression members, clear distance between longitudinal bars shall be not less than 1.5d_b nor less than ______ in.

1 ½

2

½

1

PG. 82, 7.6.3

Explanation

PG. 82, 7.6.3

28. What is the tolerance on minimum concrete cover for an 8 inch thick reinforced concrete wall?

-1/2 inch

-3/4 inch

-3/8 inch

-1/4 inch