SECTION 709 — REINFORCEMENT STEEL
709.1 REINFORCEMENT BARS —
As indicated or specified, from a manufacturer listed in Bulletin 15, and meeting the following requirements:
(a) Billet-Steel Bars.
1. Deformed.
AASHTO-M31 (ASTM-A615), Grade 60. When AASHTO-M31 (ASTM-A615), Grade 40 is indicated or specified (non-bridge items only), Grade 60 may be substituted on a bar-to-bar basis at no additional cost to the Department.
2. Plain.
AASHTO-M227 (ASTM-A663) or AASHTO-M255 (ASTM-A675), Grade 70, 75, or 80. AASHTO-M31 (ASTM-A615), Grade 40
(b) Rail-Steel Bars.
1. Deformed.
AASHTO-M42 (ASTM-A616), Grade 60, including supplementary requirements. Do not weld or bend.
2. Plain.
AASHTO-M42 (ASTM-A616), Grade 50 or 60, including supplementary requirements. Do not weld or bend.
(c) Axle-Steel Bars.
1. Deformed.
ASTM-A617, Grade 60
2.
Plain.
ASTM-A617, Grade 40 or 60
(d)
Epoxy Coating (when indicated).
AASHTO-M284 (ASTM-D3963), and modified as follows:
Section 4 — Reinforcing Steel. Add the following after the first sentence in Subsection 4.1. Steel reinforcing bars exhibiting any sliver-like defects after the heating and coating process, will be rejected unless satisfactorily repaired.
Section 7 — Requirements for Coated Bars. Subsection 7.2.1. Revise the second sentence to read: In addition, allow no more than an average of two holidays per linear foot as detected by an approved low voltage holiday detector. Add the following sentence: Satisfactorily repair all defects.
Section 12 — Repairs Due to Handling. Revise Subsection 12.2 to read: Satisfactorily repair damage to the epoxy coating that occurred during shipping or installation either as described in Section 11.1, or by mechanical wire brush cleaning and painting with an approved epoxy paint using the paint manufacturer's approved procedure. Repair any bar with visible signs of rust. Do not cover more than 5 % of the total bar surface area with patching material.
Coating color — Light color shades which will reveal rusted or undercoated areas of steel.
709.2 BAR MATS —
Steel Bars, Section 709.1, assembled into mats, as shown on the Standard Drawings, by rigidly welding or clipping the bars at joints or points of intersection.
(a) Clips.
For mechanical assembly, use No. 9 gage steel wire of sufficient ductility to prevent clip fracture in mat fabrication.
For manual assembly, use No. 12 gage spring steel wire of high elastic limit, meeting the following chemical analysis:
Percent
Element
Min.
Max.
Carbon
Manganese
Sulfur
Phosphorus
Silicon
0.45
0.90
0.00
0.00
0.08
0.70
1.20
0.045
0.045
0.15
(b) Method of Assembly (Using Clips).
Hold the bars in close contact by clips designed to exert constant pressure. Assemble at the point of manufacture, using clips of acceptable design, and fasten by mechanical means.
Use double-latching type clips for manual assembly. Use some form of locking device on the clips' free or latching ends so, when the clips are latched in place, no creeping occurs that would permit the bars to be easily moved from their required positions.
Provide approximately a 1-inch spread of the clips at intersections for required leverage to hold bars at right angles. Latch each alternate clip at right angles to the adjacent clips, to insure maximum rigidity. Use clips of sufficient length so the material is not stressed beyond the elastic limit during the latching process. A minimum length of 3 1/2 inches is required for No. 2 bars, a minimum length of 4 inches is required for No. 5 to No. 10 bars.
Other types of clips that insure equal rigidity may be submitted for acceptance.
(c) Acceptance of Design.
Submit designs for acceptance, prior to use.
709.3 STEEL WELDED WIRE FABRIC —
AASHTO-M55 (ASTM-A185). From a manufacturer listed in Bulletin 15, rigidly welded at joints and points of intersection to form a fabric reinforcement, and as shown on the Standard Drawings.
(a)
Epoxy Coating (When Indicated).
AASHTO-M284 (ASTM D3963) except as follows:
Film Thickness — 5-12 Mills on at least 90% of the recorded film thickness measurements after cure.
Continuity of Coating — No greater than an average of 2 holidays persquare foot of welded wire fabric including holidays present at wire intersections if these are not attributable to weld spurs.
Adhesion — Evaluated on a representative number of equivalent size reinforcement bars that have been processed through the cleaning and coating production line along with the welded wire fabric sheets.
Coating color — Light color shades which will reveal rusted or undercoated areas of steel.
709.4 DEFORMED WELDED WIRE FABRIC —
AASHTO-M221 (ASTM-A497). From a manufacturer listed in Bulletin 15 and as shown on the Standard Drawings. When indicated, epoxy coat in accordance with Section 709.3(a).
709.5 CERTIFICATION —
Certify as specified in Section 106.03(b)3.
Identify the appropriate specification on the certification and include the chemical and physical properties of the steel. Forward a copy to the project with the shipment of the steel.
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