ITEM 509 REINFORCING STEEL

509.01 Description

509.02 Materials

509.03 Care of Material

509.04 Method of Placing

509.05 Bending

509.06 Approval of Placing

509.07 Splicing

509.08 Supports

509.09 Epoxy Coated Reinforcing Steel

509.10 Method of Measurement

509.11 Basis of Payment

 

509.01 Description. This work consists of furnishing and placing supports, mechanical connectors, tie wires, and reinforcing steel of the quality, type, size, and quantity designated, including steel dowels.

509.02 Materials. Furnish materials conforming to:

Epoxy coatedreinforcing steel................................ 709.00

Reinforcing steel,

.... deformed bars........................... 709.01, 709.03, 709.05

Spiral reinforcing steel............................. 709.01 or 709.08

Bar mats and wire fabric................ 709.09, 709.10, 709.12

Plastic supports...................................................... 709.15

 

For metal bar supports used at or near the surface of the concrete, furnish either galvanized steel, stainless steel, epoxy coated steel or plastic coated steel.

Provide sufficient additional reinforcing steel to replace reinforcing steel removed by the Department for sampling. Replace random samples in the structures with additional steel, spliced according to 509.07.

When providing reinforcing steel for spiral cages, galvanized steel conforming to ASTM A767, Class 1, may be provided only for the spiral reinforcing steel in lieu of epoxy coated reinforcing steel. The galvanized coated reinforcing steel will meet all other requirements of 509. Where a sample splice is needed use the lap length requirements for epoxy coated. The Galvanized coating will be applied after the reinforcing has been fabricated. If the galvanized surface becomes damaged during handling in the field, repairs will conform to ASTM A780. Use bar supports and tie wires which are plastic coated or epoxy coated. Only suppliers certified under S1068 may provide this reinforcing.

509.03 Care of Material. Upon delivery to the project and before use, stack reinforcing steel off the ground and keep it free from dirt, oil, grease, or avoidable rust. Before placing in the concrete, ensure the reinforcing steel is clean and free of loose rust.

509.04 Method of Placing. Place reinforcing steel in the positions shown on the plans, and firmly secure the steel during the placing and setting of concrete. Tie barsin the superstructure at all intersections, except tie bars at alternate intersections where bar spacing is less than 1 foot (0.3 m) in any direction. The Contractormay place up to 25 percent of the upper longitudinal bars in a bridge deck slab beneath the upper transverse bars to support the top mat. Do not drive or force reinforcing steel into concrete after its initially set.

Weldingon reinforcing is prohibited, except as permitted by 709.10 and 709.12. The Engineerwill allow the Contractorto fabricate reinforcing bar cages for prestressed beams if fabrication is done in a manner satisfactory to the Director.

Install reinforcing steel with at least the following clearances from the concrete surface:

A. 2 1/2 inches (65 mm) to the top of sidewalks.

B. 3 inches (75 mm) at the faces of footings placed against rock or earth.

C. 1 1/2 inches (38 mm) to the bottom of a cast-in-place deck slab.

D. 2 inches (50 mm) at all other surfaces.

E. 2 1/4 to 2 1/2 inches (60 to 65 mm) between the reinforcing steel and the top surfaces of cast-in-place concrete deck slabs.

509.05 Bending. Bend reinforcing steel to the dimensions shown on the plans and in Table 509.05-1 (509.05-1M). Reject reinforcing steel showing transverse cracks.

TAble 509.05-1 STANDARD BENDS

 

Bar

 

Nominal Dimensions

180 Bend

90 Bend

135 Bend

Bar

Diameter

Area

Weight

D

A

D

A

D

A

Size

in

in2

lb/ft

in

in

in

in

in

in

3

0.375

0.11

0.376

2 1/4

5

2 1/4

5

1 1/2

4

4

0.500

0.20

0.668

3

6

3

7

2

4 1/2

5

0.625

0.31

1.043

3 3/4

7

3 3/4

8 1/2

2 1/2

5 1/2

6

0.750

0.44

1.502

41/2

8

4 1/2

10

 

 

7

0.875

0.60

2.044

5 1/4

10

5 1/4

12

 

 

8

1.000

0.79

2.670

6

11

6

131/2

 

 

9

1.128

1.00

3.400

9 1/2

15

9 1/2

15 1/2

 

 

10

1.270

1.27

4.303

10 3/4

17

10 3/4

18

 

 

11

1.410

1.56

5.313

12

19

12

20

 

 

14

1.693

2.25

7.65

18 1/4

27

18 1/4

25

 

 

18

2.257

4.00

13.60

24

36

24

33

 

 

Tolerances: For diameter of bends, D, the tolerance may be plus or minus the diameter of the bar. Standard fabricating tolerances shall be in accordance with the CRSI Manual of Standard Practice. No weight allowances will be made for tolerances.

 

TAble 509.05-1M STANDARD BENDS

 

Bar

 

Nominal Dimensions

180 Bend

90 Bend

135 Bend

Bar

Diameter

Area

Weight

D

A

D

A

D

A

Size

mm

mm2

kg/m

mm

mm

mm

mm

mm

mm

#10M

9.5

71

0.560

60

130

60

130

40

105

#13M

12.7

129

0.994

75

155

75

180

50

115

#16M

15.9

199

1.552

95

180

95

215

65

140

#19M

19.1

284

2.235

115

205

115

255

 

 

#22M

22.2

387

3.042

135

255

135

305

 

 

#25M

25.4

510

3.973

150

280

150

345

 

 

#29M

28.7

645

5.060

240

380

240

395

 

 

#32M

32.3

819

6.404

275

430

275

455

 

 

#36M

35.8

1006

7.907

305

485

305

510

 

 

#43M

43.0

1452

11.38

465

685

465

635

 

 

Tolerances: For diameter of bends, D, the tolerance may be plus or minus the diameter of the bar. Standard fabricating tolerances shall be in accordance with the CRSI Manual of Standard Practice. No weight allowances will be made for tolerances.

 

509.06 Approval of Placing. Before placing concrete, obtain the Engineers approval of reinforcing steel in place.

509.07 Splicing. Splice reinforcement only as specified or determined by the Engineer. Splice spiral reinforcement by lapping 1 1/2 turns. Do not replace spiral reinforcement removed for a material sample if the sample is from the end of the spiral and less than or equal to 30 inches (0.8 m) long.

Splice Nos. 14 and 18 (Nos. 45M and 55M) bars with mechanical connectors that are capable of developing 125 percent of the yield strength of the connected bars.

Splice additional steel used to replace random samples as follows:

Table 509.07-1

Bar Size

Lap Length (inches)

Uncoated

Epoxy Coated

4

22

27

5

29

35

6

34

41

7

43

52

8

57

69

9

72

87

10

92

111

11

113

137

 

Table 509.07-1M

Bar Size

Lap Length (mm)

Uncoated

Epoxy Coated

13M

560

690

16M

740

890

19M

870

1040

22M

1090

1320

25M

1450

1750

29M

1830

2210

32M

2340

2820

36M

2870

3480

 

509.08 Supports. Use precast mortar blocks, metal supports, or plastic supports of adequate strength, of the proper depth, and in sufficient number to support reinforcing steel. Space supports for reinforcing steel no more than 4 feet (1.2 m) apart transversely and longitudinally. Metal supports shall have a shape that is easily enveloped by the concrete.

Mortarblocks may only be used to support the lower matt of reinforcing steel in concrete that is cast directly against bedrock or soil.

509.09 Epoxy Coated Reinforcing Steel. Use plastic coated or epoxy coated bar supports and tie wires to protect the epoxy coating from physical damage, as specified in 709.00, during placement and to prevent electrical coupling between mats. Carefully handle and install bars to perform minimal patching at the job site. Repair physical damage to the epoxy coating with a patching material all damaged coating areas greater than 1/4-inch (6 mm) square or 1/4-inch (6 mm) diameter; approximately 1/8-inch (3 mm) square or 1/8-inch (3 mm) diameter if the opening is within 1/4-inch (6 mm) of an equal or larger opening; or, a length of 6 inches (150 mm) regardless of area. Coating damage in cases where the damaged area is less than specified above, need not be repaired. Use patching material of the same composition and quality as the original coating. Prepare the surface to a near white metal.

If repair is required, clean and repair the damaged areas and allow adequate cure time before placing concrete. The Engineerwill approve the installation once patching has been done as outlined above.

509.10 Method of Measurement. The Department will measure Epoxy Coated Reinforcing Steelby the number of pounds (kilograms) shown on the plans. Additional measurements or calculations are not required.

If the Contractorbelieves the pay weight, as shown on the plans, is in error, the Contractor is responsible to prove this discrepancy by recalculating the total weight for the reference number involved. The Contractor shall submit its figures to the Engineerfor review and approval. The number of pounds (kilograms) of reinforcing steel shall be the actual number of pounds (kilograms) of the various sizes incorporated in the concrete as shown on the plans, completed and accepted.

If the weight of the reinforcing steel is recalculated, determine the number of pounds (kilograms) from the number, length, and weight of the bars as shown on the steel list of the plans, based on the weight per foot (meter) shown in the Table 509.05-1 (509.05-1M) with deductions for bars not used, and addition for extra bars used as directed by the Engineer.

509.11 Basis of Payment. The Department will not include the supports, mechanical connectors, and tie wires in the calculated weights but will consider them incidental to the price bid.

The Department will pay for accepted quantities at the contract price as follows:

Item unit Description

509 Pounds (Kilograms) Epoxy Coated Reinforcing