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CRSI - Placing Reinforcing Bars Questions & Answers

Question Set #1

1. Cover for reinforcing in a concrete structural member is measured as follows:

A. distance from the outside of the bar to the face of the concreteB. distance from the centerline of the bar to the face of the concreteC. distance from the inside of the bar to the face of the concreteD. distance from the centerline of the bar to the face of the form

2. According to the CRSI, for concrete work, welded splices are almost always necessary.

A. slab on gradeB. columnsC. post tensionedD. precast

3. The specifications for a project require a 30 bar diameter lap splice on all reinforcing. The required length ofsplice for a #7 bar is .

A. 30"B. 26-1/4"C. 10-3/4"D. 18"

4. The minimum concrete cover over reinforcing steel, when the concrete is poured against the earthis .

A. 3"B. 2"C. 1-1/2"D. 3/4"

5. According to the CRSI, the nominal diameter of a #11 bar is .

A. 1.56"B. 1.1"C. 1.41"D. 1.0"

6. The reinforcement tolerance for umber 1 column footers is?

A. +/- .5”B. +/- .25”C+/- .005”D. +/- .05”

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7. The is a stiff legged boom usually mounted on a material tower adjacent to the structure under construction.

A. truck craneB. climbing craneC. Chicago boomD. hydraulic crane

8. In building construction, spacing of rebar in an office building slabs on grade are generally reinforced with#3, 4 or 5 bars spaced on center.

A. 6" to 12"B. 8" to 12"C. 10" to 16"D. 12" to 24"

9. For preassembled rebar mats, a sufficient number of intersections must be tied; when using snapties must be tied.

A. every intersectionB. all perimeter intersections & every third interiorC. every perimeter intersection & alternate intersections with the interiorD. alternate sections throughout the mat

10. The specifications for a project require a 30 bar diameter splice on all reinforcing. The required length ofsplice for a #8 bar is .

A. 24"B. 30"C. 32"D. 36"

11. Welded splices are almost always necessary in concrete work.

A. precastB. post-tensionedC. cast-in-placeD. bridge

12. The standard type of reinforcing bar is known as a .

A. dowel barB. smooth round barC. plain barD. deformed bar

13. Typically the tolerance for the spacing of rebar is such that all of the following are true except:

A. must be within 1/2” +/- of design locationB. a few bars could be shifted to avoid an insertC. no spaces between bars should be greater than 3 times the wall thicknessD. no cutting to allow clearance for obstructions

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14. Concrete is a mixture of one part of cement, fine aggregate, coarse aggregate and clean water.Coarse aggregate constitutes about _____ parts.

A. 1 to 2B. 1-1/2 to 2-1/2C. 2 to 3D. 3 to 5

15. A continuous foundation wall extending below the frost line to good bearing soil is referred to as a:

A. retaining wallB. bearing wallC. grade beamD. spread footing

16. Concrete is strong in:

A. tensionB. compressionC. shearD. torsion

17. Concrete is tested in cylinders measuring ________ in diameter.

A. 6"B. 8"C. 10"D. 12"

18. A footing supported by uniform soil pressure upward over the entire area of the footing, resisting columnloads at 2 or more points, is called a:

A. cantilever footingB. solid footingC. combined footingD. grade footing

19. An ASTM Grade 40 reinforcing bar has a:

A. maximum strength of 40,000 psi without any lengthening of barB. minimum strength of 40,000 psi without any lengthening of barC. minimum strength with stretching of the bar of 40,000 psi with the bar returning to its original length whenthe load is releasedD. minimum strength with stretching of the bar

20. A #6 bar weighs ______ pounds per lineal foot.

A. 1.043B. 1.520C. 2.044D. 1.502

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21. The overall diameter of a #5 rebar is:

A. 1/2"B. 9/16"C. 5/8"D. 11/16"

22. Reinforcing bars with rust or mill scale or a combination of both are considered to be acceptable ______provided that the minimum dimensions including height of deformations and weight of a cleaned sample, shallnot be less than ASTM specifications require.

A. only when cleaned and brushedB. for light rush only, when cleaned and brushedC. for light rush only, without cleaning and brushingD. without cleaning and brushing

23. When hoisting bundles of bars ______ or longer, it may be necessary to use a spreader bar so that the barswill not bend excessively.

A. 20'B. 30'C. 40'D. 50'

24. When using a spreader bar to lift a bundle of bars, the length of the spreader bar should be at least______times the length of the bars in the bundle.

A. 1/4B. 1/2C. 1-1/2D. 2

25. Two choker hitches are being used to lift a bundle of steel weighing 4,000 pounds. The distance betweenchoker hitches is 18' with the length of each choker at 20'. The maximum tension on each choker is _____pounds. Assume equal loading on each choker sling.

A. 2,240B. 2,980C. 3,875D. 4,588

26. The type of rebar splices that are generally field welded are the:

A. hot forged splicesB. metal fillet splicesC. end bearing splicesD. lap splices and butt splices

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27. The height of a bar support is taken as the distance from the bottom of the leg, sand plate or runner wire tothe underside of the reinforcing bar when it is correctly positioned on the support. A variation of plus or minus______ from the specified nominal height is normal tolerance.

A. 1/16"B. 1/8"C. 1/4"D. 3/8"

28. When placing reinforcing bars in slabs up to 4” thick?

A. Number 4 standees can be usedB. Top mats can be usedC. Number 7 or number 8 bar standees can be usedD. Precast concrete blocks can be used

29. The proper embedment of reinforcing bars in concrete is very important. The minimum coverage forconcrete walls cast against earth, using a #3 bar is:

A. 2"B. 3/4"C. 1-1/2"D. 3"

30. When placing bars in slabs or walls, the exact spacing of the bars is not critical, however no spacingbetween bars should be greater than ______ times the thickness of the slab or wall or 12 inches.

A. 1-1/2B. 2C. 2-1/2D. 3

31. Welded lap splices with bars in contact are recommended only for ______ bars or smaller.

A. #4B. #5C. #6D. #8

32. Field welding of crossing bars should be avoided. Tests have shown that this can reduce the strength of a barto ______ of its original capacity.

A. 25% to 30%B. 30% to 35%C. 35% to 40%D. 40% to 45%

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33. Tie wire varies somewhat in different regions across the country. Tie wire is usually available in coilsweighing between:

A. 3 to 4 poundsB. 5 to 6 poundsC. 7 to 8 poundsD. 9 to 10 pounds

34. Wire used for tying reinforcing bars is usually number ______ gauge black, soft-annealed wire.

A. 12B. 14C. 16D. 18

35. It is not necessary to tie bars at every intersection. In most cases tying every _______ intersection ofreinforcing bars is sufficient.

A. barB. otherC. thirdD. fourth or fifth

36. It is the ________ responsibility to furnish lines, grades or elevations, templates and wooden racks for thebar placing subcontractor's use.

A. engineer'sB. architect'sC. general contractor'sD. subcontractor's

37. A _________ is a partition placed in a form to hold fresh concrete, earth or water.

A. capitalB. cat-headC. bulkheadD. billet

38. A concrete slab cast in one operation is called a _______ slab.

A. monolithicB. liftC. parapetD. precast

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39. It is general practice to place temperature reinforcement steel in slabs ______ to the main stress carryingsteel to help control concrete shrinkage.

A. diagonallyB. parallelC. at right anglesD. at 45° angles

40. One way to protect reinforcing bars from corrosion is to coat the bars with a:

A. a minimum 5 mil thickness coating of asphaltB. coating of 85% galvanize & 15% copperC. metallic coating of epoxyD. metallic coating of zinc

41. The standard type bar is:

A. the deformed barB. Grade 40C. Grade 50D. A706

42. What is the yield strength of grade 40 reinforcing steel?

A. 4,000 psi minimum yield strengthB. 40,000 psi minimum breaking strengthC. 40,000 psi ultimate tensile strengthD. 40,000 psi minimum yield strength

43. The project specifications should limit the maximum amount of repaired damage on epoxy-coatedreinforcing bars to about _____ of the surface area per foot of each bar.

A. 2%B. 5%C. 7%D. 10%

44. What is the stock length of reinforcing bars?

A. 20'B. 40'C. 60'D. 80'

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45. According to CRSI, which of the above is the proper lateral steel reinforcing (dashed lines) in a continuousconcrete beam extending two spans?

A.AB.BC.CD.D

46. According to CRSI, which of the above is the proper lateral steel reinforcing (dashed lines) ina cantilever concrete beam extending two spans?

A.AB.BC.CD.D

47. According to CRSI, which of the above is the proper placement of steel reinforcing in a combined footingwith column loads at two points?

A. AB. BC. CD. D

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48. According to CRSI, a hole bored in a template to accommodate a #11 reinforcement bar would have adiameter of inches.

A. 1 - 3/8B. 1 - 1/2C. 1 - 5/8D. none are acceptable

49. According to CRSI, an ASTM Grade 40 reinforcing bar has a .

A. Max strength of 40,000 psi without any lengthening of the barB minimum strength of 40,000 psi without any lengthening of the barC. Minimum strength with stretching of the bar of 40,000 psi with the bar returning to its original length whenthe load is released (elastic bar deformation)D. Minimum strength with stretching of the bar of 40,000 psi with the bar not returning to its original lengthwhen the load is released (plastic bar deformation)

50. Given: In reinforced concrete construction, #4 steel reinforcing bar is lapped a minimum of 40 times the bardiameter. According to CRSI, the minimum length of bar lap is .

A. 10 inchesB. 1 foot, 4 inchesC. 1 foot, 8 inchesD. 1 foot, 10 inches.

51. According to CRSI, an ASTM grade 60 reinforcing bar has a .

A. Max strength of 60,000 psi without any lengthening of the barB. Minimum strength of 60,000 psi without any lengthening of the barC. Minimum strength with stretching of the bar of 60,000 psi with the bar returning to its original length whenthe load is released (elastic bar deformation)D. Minimum strength with stretching of the bar of 60,000 psi with the bar not returning to its original lengthwhen the load is released (plastic bar deformation)

52. According to CRSI, reinforcing bars with rust or mill scale or a combination of both are considered tobe provided that the minimum dimensions, including height of deformations and weight of a cleaned sample, shall not be less than ASTM specification

A. Acceptable for use in non-structural members onlyB. Acceptable only when cleaned and brushedC. Acceptable for light rust only, when cleaned and brushedD. Acceptable without cleaning or brushing

53. According to CRSI, reinforcing bars placed in footings against the ground shall have a minimum concretecover of .

A.3/4"B. 2"C. 3"D. 1-1/2"

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54. According to CRSI, the recommended minimum cover (or protection) for #5 reinforcing bars in concretewalls exposed directly to the ground is .

A. 3/4 inch from outside of bar to face of concreteB. 1-1/2 inches from center of bar to face of concreteC. 1-1/2 inches from outside of bar to face of concreteD. 2 inches from center of bar to face of concrete

55. Welded lap slices with bars in contact are recommended only for bars or smaller.

A. Number 5B. Number 4C. Number 6D. Number 3

56. The minimum concrete cover at the sides of reinforcement bars cast against earth and on bottoms of footingsis?

A. .125’B. .17’C. .25’D. .33’

57. Number 5 rebar is lapped 15 times its diameter. The length of the lap is?

A. 9.39”B. 9’ ¾”C. .78”D. .78’

58. According to code, rust or mill scale on reinforcement bar?

A. Shall be considered unsatisfactoryB. Shall be considered satisfactory, provided the minimum dimensions excluding height of deformationscomply with applicable ASTM standardsC. Shall be considered satisfactory, provided the minimum dimensions including height of deformations complywith applicable OSHA standardsD. Shall be considered satisfactory, provided the minimum dimensions including height of deformations complywith applicable ASTM standards

59. The minimum standard concrete cover for spirals in columns is inches.

A. 1B. 1.5C. 2D. 2.5

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60. The recommended minimum concrete cover (or protection) for #3 reinforcing bars in an in-ground concretepool shell is inches.

A. 3/4B. 1C. 1 — 1/4D.3

61. According to CRSI, welded lap splices with bars in contact should be used only on .

A. All bar sizesB. #14 and #18 barsC. #16 bars and largerD. #6 bars and smaller

62. According to CRSI, wire used for tying reinforcing bars is usually the number gauge black, soft-annealed wire.

A. 12B. 14C. 16D. 18

63. Which is the best way to secure reinforcing bars in walls?

A. Wrap and snap tieB. Single tieC. Saddle tieD. Wrap and saddle tie

64. According to CRSI, when tying #3 reinforcing bars in a concrete pool shell, in most cases it is necessary totie intersection.

A. EveryB. Every second or thirdC. Every fourth or fifthD. Every sixth or seventh

65. According to CRSI, no space between reinforcing bars should be greater than times the thickness of the slab.

A. 1 1/2B. 2C. 2 1/2D. 3

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66. According to CRSI, the tolerance for spacing straight reinforcing bars in solid slabs is inches.

A. +/- 1/4B. +/- 1/2C. +/- 1D. +/- 3

67. Reinforcing bars are usually placed inches above the bottom.

A. 4B. 5C. 6D. 3

68. According to CRSI, which of the following columns show the minimum recommended lap splicedreinforcement tie(s) for a column, when the minimum distance between the vertical bars is 7 inches?

A.AB. BC. CD. D

69. According to CRSI, the minimum number of bars for a tied column shall be .

A. 2B. 4C. 6D. None are acceptable

70. According to CRSI, when placing deep, heavily reinforced beams that cannot be preassembles, beambolsters should be spaced at feet on center maximum, resting on the bottom.

A. 3'0"B. 4'0"C. 5'0"D. 6'0"

71. According to CRSI, minimum spaces for chairs used to support joist rebars shall be as close to feet apart as possible.

A. 4B. 5C. 6D. 7

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72. According to CRSI, a/an joint is a construction joint in concrete occurring where continuous pouring has been interrupted.

A. ExpansionB. ContractionC. ColdD. Shear

73. According to CRSI, it is allowable to omit rebars across which of the following transverse joints?

A. ConstructionB. ExpansionC. ContractionD. None of these

74. According to CRSI, reinforcing bars that are used in bundles shall not .

A. Exceed 4 in numberB. Exceed 6 in numberC. Exceed #11D. Both A and C

75. In tolerances in spacing bars in walls and solid slabs, bar spacing should not be greater than____times thethickness of the slab or wall, nor ____inches

A. 6; 15B. 3; 18C. 3; 12D. None of the above

76. Assume the construction of concrete slab requires the following reinforcement bars:

120 #7 bars, 20 feet long40 #5 bars, 30 feet long80 #6 bars, 30 feet long

Assume also that the cost of steel in place is $10.00 per 100 pounds.The approximate total cost of the steel in the slab reading for pouring is

A. $4,800.00B. $ 488.00C. $1,200.00D. $ 976.20

77. The total tons of rebar required for the grade beams is?

A. Less than 1.7B. Between 1.7 and 1.8C. Between 1.8 and 1.9D. More than 1.9

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78. The use of welded rebar is normally required for which concrete members?

A. Post-tensionedB. PrecastC. Pre-tensionedD. Post cast

79. In residential construction #5 rebar is usually spaced how many inches apart?

A. 6B. 10C. 14D. 24

80. Which provides rebar with protection from chloride attack?

A. CopperB. ZincC. PaintD. Magnesium

81. Rebar costs $19.80 per 100 pounds. Labor cost to install the rebar is $289.00 per ton. The cost to purchaseand install the rebar in all Number One pile caps is?

A. Less than $1,000B. Between $1,001 and $1,500C. Between $1,501 and $2,000D. More than $2,000

82. In cast-in-place exterior wall face containing #6 reinforcing steel the minimum cover shallbe inch(es).

A.3B. 1C. 2D. 2.5

83. Repairs to damaged epoxy coated reinforcing bars should be limited to about percent of the surface area per square foot.

A.2B.3C.4D.5

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84. Which of the following statements is true regarding reinforcing steel?

A. A small amount of tight rust and scale is acceptable as long as the bars still comply with ASTM standards.B. All bar sizes must be completely free of rust and scaleC. Some foreign or organic matter such as mud or oil is acceptable on all sizes of barsD. care should be given during unloading of bars that rust and mill scale is not removed

85. The pounds of rebar required for stairwell grade beam is?

A. Less than 1,000B. Between 1,000 and 1,300C. Between 1,300 and 1,600D. More than 1,600

Feedback Questions

1. The main purpose of steel reinforcement is to .

2. A bearing wall must rest upon a continuous footing how many times as wide as the thickness of the wall?

3. Piles for footings are driven in and cut off at the same level about how many inches above the bottom of thefooting?

4. What are beams around the outside edges of the floor called?

5. Concrete is weak in tension and?

6. Diagonal tension usually cracks near the support and extends upward at what angle?

7. What are small U-shaped or W-shaped reinforcement bars that are used in beams to help resist diagonaltension known as?

8. What type of beam requires the tension bars to be placed in the top of the beam?

9. When reinforcement bars are placed at right angles to the main stress carrying steel, this is known as what?

10. How is concrete protection of reinforcement measured?

11. What is the diameter of a No. 5 rebar?

12. What does ASTM require a producer to stamp on the bars?

13. What is the minimum diameter of a collapsible spiral if the spiral bar size is 5/8”?

14. When hoisting bars 30 feet or longer, use an OSHA approved spreader bar that is at least how long,compared to the bars being lifted?

15. What length are beam bolsters furnished in?

16. What is the minimum standard coverage of concrete over reinforcement when not specified?

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17. Lowering the top bars or raising the bottom bars by ½ inch or more than specified in a six inch deep slabwill reduce its load carrying capacity by what percent?

18. What type of bar has the most tolerance for placement?

19. Is the exact spacing of bars important on long runs of slabs or walls?

20. What is the maximum tolerance spacing between bars in walls & slab floors?

21. Tack or spot welding can reduce the strength of a bar to what percent of its original capacity?

22. What gage wire is usually used for tying reinforcing bars?

23. What is used to maintain the position of reinforcement steel in a wall?24. What is used to secure reinforcing in place during a concrete wall pour?

25. When preparing a mat slab, how far above the mud slab should the rebar be placed?

26. What distance should the top bars be below the top of a concrete slab?

27. A bar support used for foundation mats that are usually custom fabricated per the contractorsrecommendations are known as .

28. What type of reinforcing bar support is used to support foundation mat that is 3 feet abovethe ground?

29. What is the maximum spacing for wall reinforcement ties?

30. There should not be fewer than how many ties to any one bar when building a curtain wall?

31. Joist chairs are placed, beginning 1 foot from the edge of each support and at intermediate spacing’s as closeto what distance apart as possible?

32. A joist chair usually carries how many reinforcing bars?

33. When is temperature reinforcement placed?

34. When reinforcement bars are used as temperature reinforcement, where are they placed?

35. What are the indentations in a waffle slab sometimes called?

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ANSWER KEY

9 th Ed.Set #1

1. A 11-3

2. D 11-27

3. B 6-2 (Table 6-1)

The table indicates that the diameter for #7 bar is 0.875. Since the question indicates the specifications for the project require 30 bar diameter lap splice, you will multiply the diameter of #7 bar (0.875) by 30. 0.875 x 30 = 26.25

4. A 11-3

5. C 6-2 (Table 6-1)

6. A 6-18

7. C 8-3

8. B 13-27

9. C 11-33

10. B 6-2 (Table 6-1)

The table indicates that the diameter for #8 bar is 0.875. Since the question indicates the specifications for the project require 30 bar diameter lap splice, you will multiply the diameter of #7 bar (1.000) by 30. 1.000 x 30 = 30

11. A 11-27

12. D 6-1

13. A 11-4

14. D 2-1

15. C 3-2

16. B 5-1

17. A 5-1

18. C 5-6

19. C 6-2; 6-3

20. D 6-2 (Table 6-1)

21. D. 6-21 (Table 6-6)

22. D. 8-3

17

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23. B 8-5

9 th Ed.

24. B 8-5

25. A 8-16

26. D 11-25

27. B 10-1

28. A 13-27

29. C 11-2 & 11-3, Fig. 11-1(b)

30. D 11-5

31. C 11-25

32. C 11-27

33. A 11-27

34. C 11-27

35. D 11-31

36. C 12-5

37. C G-4

38. A G-13

39. C 5-7

40. D 18-1

41. A 6-1

42. D 6-2; 6-3

43. A 18-2

44. C 11-13

45. D 5-5

46. D 5-5

47. D 5-6

48. C 6-21 (Table 6-6)

49. C 6-2; 6-3

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9 th Ed.

50. C 6-2 (Table 6-1)

The table indicates that the diameter for #4 bar is 0.875. Since the question indicates the specifications for the project require a minimum of 40x the bar diameter, you will multiply the diameter of #4 bar (0.500) by 40. 0.500 x 40 = 20 inches, or 1 foot, 8 inches.

51. C 6-2; 6-3

52. D 8-3

53. C 11-3

54. C 11-3

55. C 11-25

56. C 11-3

57. D 6-2 (15 X .625 = 9.375 inches; 9.375/.12= .78 ft)

58. D 18-1

59. B 11-3

60. D 11-3

61. D 11-25

62. C 11-27

63. A 11-29

64. C 11-31

65. D 11-5

66. D 11-6

67. D 12-1

68. C 12-22

69. B 12-22

70. C 13-3

71. B 13-6

72. C G-5

73. D 16-6

74. A G-4

75. B 11-5

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9 th Ed.

76. D 6-2

120 bars x 20 ft x 2.044 lbs/ft = 4905.60 lbs40 bars x 30 ft x 1.043lbs/ft = 1251.60 lbs80 bars x 30ft x 1.502lbs/ft = 3604.80 lbs4905.60+1251.60+3604.80 = 9762.00 lbs then 9762.00lbs/100lbs x $10 = $976.20

77. A 6-2

Centerline: 1 + 20 + 20 + 19 + 1 + 1 + 19 + 20 + 20 + 19 + 1 + 1 + 19 = 161Protection: 161 - .25 - .25 = 160.5# Beams x # Bars x L x WPF ÷ 2,000 = Tons2 x 10 x 160.5 x 1.043 ÷ 2,000 = 1.67

78. B 11-27

79. B 13-27

80. B 18-1

81. D 6-2; 6-3

TOP & BOTTOM X # WAYS X # BARS X # FOOTINGS X L X WT/FT = POUNDS

2 X 2 X 10 X 20 X 5 X 1.502= 6,008

REBAR COST: POUNDS ÷ 100 X COST = TOTAL

LABOR COST: POUNDS ÷ 2,000 X COST = TOTAL

TOTAL COST: 1,189.58 + 868.16 = 2,057.74

82. C 11-3

83.A 18-2

84.A 10-6

85. D 6-2 (Table 6-1)

************************************************************************************

9 th Ed.

Set # 2

1. Resist pull, Tensile Strength 2-1

2. 2 times 3-1

3. 6 inches 3-3

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4. Spandrel Beams 3-4

5. Shear 5-1

6. 45 degrees 5-3

7. Stirrups 5-4

8. A cantilevered beam 5-5

9. Temperature steel 5-7

10. From the face of the concrete to the outside of the reinforcement. 5-10

11. .625 inch 6-2

12. Producers mill number, Size of the bar, Symbol for steel type, 6-3

Marking for grades 60 & 75

13. 30 inches 6-11

14. ½ the length 8-5

15. 5 Feet 10-4

16. 3 inches 11-3

17. 20 % 11-3

18. Longitudinal reinforcing bar 11-4

19. No 11-5

20. 3 times the thickness of the slab or wall, nor 18 inches 11-5

21. 35 -40 % 11-27

22. 16 gage 11-27

23. Wire ties 11-29

24. A wrap and snap tie. 11-29

25. 3 inches 12-10

26. 2 inches 12-10

27. Standee’s 12-12

28. A Standee using #5 bars 12-12

29. 4 to 6 feet 12-13

30. 3 12-13

31. 5 feet 13-6

32. 2 13-6

33. Last, on top of all bars, sleeves and conduits. 13-8

34. On top of all other bars, parallel to the joist bars 13-8

35. Domes 13-18

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