**Construction Specification 734---Steel Reinforcement**

**1. Scope**

The work shall consist of furnishing and placing steel reinforcement for
reinforced concrete or pneumatically applied mortar.

**2. Material**

Steel reinforcement shall conform to the requirements of Section 835,
Steel Reinforcement, of the latest edition of the Alabama Department of
Transportation Standard Specifications for Highway Construction. Before
reinforcement is placed, the surface of the bars and fabric and any
metal supports shall be cleaned to remove any loose, flaky rust, mill
scale, oil, grease, or other undesirable coatings or foreign substances.
Epoxy-coated steel reinforcement shall be free of surface damage. After
placement, the reinforcement shall be maintained in a clean and
serviceable condition until it is completely embedded within the
concrete.

**3. Bar schedule, lists and diagrams**

Any supplemental bar schedules, bar lists or bar-bending diagrams
required in section 10 of this specification to accomplish the
fabrication and placement of steel reinforcement shall be provided by
the contractor. Before reinforcement is placed, the contractor shall
furnish four copies of any such lists or diagrams to the contracting
officer for approval. Acceptance of the reinforcement is not based on
approval of these lists or diagrams, but on inspection of the steel
reinforcement after it has been placed, tied, and supported and is ready
to receive concrete.

**4. Bending**

Reinforcement shall be cut and bent in compliance with the requirements
of the American Concrete Institute Standard 315. Bars shall not be bent
or straightened in a manner that will injure or weaken the material.
Bars with kinks, cracks, or improper bends will be rejected.

**5. Splicing bar reinforcement**

Splices of reinforcement shall be made only at locations shown on the
drawings and provided by the steel schedule. Placement of bars at the
lap splice locations shown, when not in contact, shall not be farther
apart than one-fifth the shown lap length and in any case no greater
than 6 inches.

**6. Splicing welded wire fabric**

Unless otherwise specified, welded wire fabric shall be spliced in the
following manner:

**End-to-end---**Adjacent sections shall be spliced end-to-end
(longitudinal lap) by overlapping a minimum of one full mesh plus 2
inches plus the length of the two end overhangs. The splice length is
measured from the end of the longitudinal wires in one piece of fabric
to the end of the longitudinal wire in the lapped piece of fabric.

**Side-to-side---**Adjacent sections shall be spliced side to side
(transverse lap) a minimum of one full mesh plus 2 inches. The splice
length shall be measured from the centerline of the first longitudinal
wire in one piece of fabric to the centerline of the first longitudinal
wire in the lapped piece of fabric.

**7. Placing**

Reinforcement shall be accurately placed and secured in position to
prevent its displacement during the placement of concrete. Tack welding
of bars is not permitted. Metal chairs, metal hangers, metal spacers,
and concrete chairs may be used to support the reinforcement. Metal
hangers, spacers, and ties shall be placed in such a manner that they
are not exposed in the finished concrete surface. The legs of metal
chairs or side form spacers that may be exposed on any face of slabs,
walls, beams, or other concrete surfaces shall have a protective coating
or finish. The coating or finish can be hot dip galvanizing, epoxy
coating, plastic coating, or stainless steel. Metal chairs and spacers
not fully covered by a protective coating or finish shall have a minimum
cover of 0.75 inch of concrete over the unprotected metal part. The
exception is that those with plastic coatings may have a minimum cover
of 0.5 inch of concrete over the unprotected metal part. Precast
concrete chairs shall be manufactured of the same class of concrete as
specified for the structure and shall have the tie wires securely
anchored in the chair or a V-shaped groove at least 0.75 inch in depth
molded into the upper surface to receive the steel bar at the point of
support. Precast concrete chairs shall be clean and moist at the time
concrete is placed.

High density or structural plastic rebar accessories designed to ensure
maximum concrete bond may be substituted for metal or concrete
accessories in spacer applications as approved by the contracting
officer. Exposure of plastic rebar accessories at the finished concrete
surface shall be kept to a minimum. Plastic rebar accessories, when
used, shall be staggered along adjacent parallel bars and shall be
placed at intervals no closer than 12 inches. Plastic rebar accessories
shall not be used in concrete sections 6 inches or less in thickness.

Reinforcement shall not be placed until the prepared site has been
inspected and approved. After placement of the reinforcement, concrete
shall not be placed until the reinforcement has been inspected and
approved by the contracting officer\'s technical representative (COTR).

**8. Storage**

Steel reinforcement stored at the work site shall be placed on
platforms, skids, or other supports. This is done so that contact with
the ground is avoided and the material is protected from mechanical
damage and/or corrosion.

**9. Measurement and payment**

***Method 1---***For items of work for which specific unit prices are
established in the contract, the weight of steel reinforcement placed in
the concrete in accordance with the drawings is determined to the
nearest pound by computation from the placing drawings. Measurement of
hooks and bends is based on the requirements of ACI Standard 315.
Computation of weights of reinforcement is based on the unit weights
established in tables 34--1 and 34--2 of this specification. Computation
of weights for welded wire fabric not shown in table 34--2 shall be
based on ACI Standard 315. The area of welded wire fabric reinforcement
placed in the concrete in accordance with the drawings is determined to
the nearest square foot by computation from the placing drawings with no
allowance for required laps. The weight of steel reinforcing in extra
splices or extra-length splices approved for the convenience of the
contractor or the weight of supports and ties is not included in the
measurement for payment.

Payment for furnishing and placing reinforcing steel is made at the
contract unit price. Such payment constitutes full compensation for all
labor, material, equipment, and all other items necessary and incidental
to the completion of the work including preparing and furnishing bar
schedules, lists, or diagrams; furnishing and attaching ties and
supports; and furnishing, transporting, storing, cutting, bending,
cleaning, and securing all reinforcements.

***Method 2---***For items of work for which specific unit prices are
established in the contract, the weight of bar reinforcement placed in
the concrete in accordance with the drawings is determined to the
nearest pound by computation from the placing drawings. Measurement of
hooks and bends is based on the requirements of ACI Standard 315.
Computation of weights of bar reinforcement is based on the unit weights
established in table 34--1 of this specification. The weight of steel
reinforcing in extra splices or extra length splices approved for the
convenience of the contractor or the weight of supports and ties is not
included in the measurement for payment.

The area of welded wire fabric reinforcement placed in the concrete in
accordance with the drawings is determined to the nearest square foot by
computation from the placing drawings with no allowance for required
laps.

Payment for furnishing and placing bar reinforcing steel is made at the
contract unit price for bar reinforcement. Payment for furnishing and
placing welded wire fabric reinforcing steel is made at the contract
unit price for welded wire fabric reinforcement. Such payment
constitutes full compensation for all labor, material, equipment, and
all other items necessary and incidental to the completion of the work
including preparing and furnishing bar schedules, lists, or diagrams;
furnishing and attaching ties and supports; and furnishing,
transporting, cutting, bending, cleaning, and securing all
reinforcement.

***All Methods---***The following provisions apply to all methods of
measurement and payment. Compensation for any item of work described in
the contract, but not listed in the bid schedule, is included in the
payment for the item of work to which it is made subsidiary. Such items
to which they are made subsidiary are identified in section 10 of this
specification.

  ----------------------------- -----------------------------------------
  **Table 34--1. Standard       
  reinforcing bars.**           

  **Bar size no.**              **Weight (lb/ft)**

  0.3                           0.376

  0.4                           0.668

  0.5                           1.043

  0.6                           1.502

  0.7                           2.044

  0.8                           2.670

  0.9                           3.400

  10.0                          4.303

  11.0                          5.313

  14.0                          7.650

  18.0                          13.600
  ----------------------------- -----------------------------------------

+------------------------+------------------------+-------------------+
| **Table 34--2.         |                        |                   |
| Rectangular welded     |                        |                   |
| wire fabric.**         |                        |                   |
+------------------------+------------------------+-------------------+
| **Style designation    |                        |                   |
| ^[1]{.underline}/^**   |                        |                   |
+------------------------+------------------------+-------------------+
| **Weight**             |                        |                   |
+------------------------+------------------------+-------------------+
| **by steel wire        | **by W-number**        | **(lb./100        |
| gauge**                |                        | ft^2^)**          |
+------------------------+------------------------+-------------------+
| 6 x 6 -- 10 x 10       | 6 x 6 -- W1.4 x W1.4   | 21                |
+------------------------+------------------------+-------------------+
| 6 x 6 -- 8 x 8         | 6 x 6 -- W2.1 x W2.1   | 30                |
+------------------------+------------------------+-------------------+
| 6 x 6 -- 6 x 6         | 6 x 6 -- W2.9 x W2.9   | 42                |
+------------------------+------------------------+-------------------+
| 6 x 6 -- 4 x 4         | 6 x 6 -- W4.0 x W4.0   | 58                |
+------------------------+------------------------+-------------------+
| 4 x 4 -- 10 x 10       | 4 x 4 -- W1.4 x W1.4   | 31                |
+------------------------+------------------------+-------------------+
| 4 x 4 -- 8 x 8         | 4 x 4 -- W2.1 x W2.1   | 44                |
+------------------------+------------------------+-------------------+
| 4 x 4 -- 6 x 6         | 4 x 4 -- W2.9 x W2.9   | 62                |
+------------------------+------------------------+-------------------+
| 4 x 4 -- 4 x 4         | 4 x 4 -- W4.0 x W4.0   | 85                |
+------------------------+------------------------+-------------------+
| 4 x 12 -- 8 x 12       | 4 x 12 -- W2.1 x W0.9  | 25                |
|                        | ^[2]{.underline}/^     |                   |
+------------------------+------------------------+-------------------+
| 4 x 12 -- 7 x 11       | 4 x 12 -- W2.5 x W1.1  | 31                |
|                        | ^[2]{.underline}/^     |                   |
+------------------------+------------------------+-------------------+
| ^[1]{.underline}/^     |                        |                   |
| Style designation is   |                        |                   |
| defined in ACI         |                        |                   |
| Standard 315 of the    |                        |                   |
| American Concrete      |                        |                   |
| Institute.             |                        |                   |
|                        |                        |                   |
| ^[2]{.underline}/^     |                        |                   |
| Welded smooth wire     |                        |                   |
| fabric with wires      |                        |                   |
| smaller than size W1.4 |                        |                   |
| is manufactured from   |                        |                   |
| galvanized wire.       |                        |                   |
+------------------------+------------------------+-------------------+

**10. Items of work and construction details**

Items of work to be performed in conformance with this specification and
the construction details therefore are:

[Bid Item 13, Steel Reinforcement]{.underline}

(1) This item shall consist of furnishing and installing the reinforcing
    steel required in the concrete box inlet as shown on the drawings.

(2) Measurement and payment shall be by Method .