7-57 SECTION 713 – CONCRETE REINFORCING MATERIALS
713.01 BAR REINFORCEMENT . Bar reinforcement shall be Grade 60 deformed bar unless otherwise
specified herein.
a.Reinforcing Steel . Reinforcing steel shall be in accordance with AASHTO M 31 , Type S, including supplementary requirements. Reinforcing steel shall not have corrosion protection.
b.Low-Alloy Reinforcing Steel . Low -alloy reinforcing steel shall be in accordance with AASHTO M 31, Type W.
c.Epoxy -Coated Reinforcing Steel . Epoxy -coated reinforcing st eel shall have an electrostatically applied epoxy protective coating which has been prequalified, fabricated, tested, and installed in accordance with the requirements of ASTM A775 . Steel reinforcing bars to be coated shall be in accordance with ASTM A615 or ASTM A706 .
d.Dual -Coated Reinforcing Steel . Dual -coated reinforcing steel shall be in accordance with ASTM A1055 , Type I or Type II . Steel reinforcing bars to be coated shall be in accordance with ASTM A615 or ASTM A706 .
e.Continuous Galvanized Rein forcing Steel . Continuous galvanized reinforcing steel shall be in accordance with ASTM A1094 . Steel reinforcing bars to be coated shall be in accordance with ASTM A615 or ASTM A706 .
f.Low-Carbon, Chromium, Steel . Low -carbon, chromium, steel shall be in accordance with AASHTO M 334 and UNS designation K81550, Grade 100.
g.Hot-Dipped Galvanized Reinforcing Steel . Hot -dipped galvanized reinforcing steel shall be in accordance with ASTM A767 , Class 1 coating. Steel reinforcing bars to be coated shall be in accordance with ASTM A615 or ASTM A706 . Chromate treatment will not be required.
h.Solid Stainless Reinforcing Steel . Solid stainless reinforcing steel shall be in accordance with ASTM A955 with a UNS designation of S24100, S31653, S32101, S32205, or S3 2304. Different designations shall not be mixed within the same project. Elongation requirements for solid stainless reinforcing steel shall be the same as for the equivalent size and grade of AASHTO M 31 , Type S reinforcing steel. 7-58 713.02 MECHANICAL SPLICES FOR BAR REINFORCEMENT . Mechanical splices for bar reinforcement shall develop, in tension or compression, a minimum of 125% of the specified yield strength of the bar intended to be spliced. Mechanical splices shall be installed in accordance with the manufacturer’s recommendations or as ordered by the Engineer.
713.03 WELDED WIRE REINFORCEMENT . Welded steel wire reinforcement for concrete structures
shall be in accordance with AASHTO M 336 , including supplementary requirements.
713.04 Prestressing Strand and Post -Tensioning Strand .
a.Prestressing Strands . Prestressing strands shall be strands of the diameter shown on the Plans and shall be in accordance with AASHTO M 203 , Grade 270 .
b.Post-Tensioning Strands . Post -tensioning strands shall conform to the requirements of AASHTO M 203 or AASHTO M 204 .
713.05 FIBER REINFORCEMENT . Fiber reinforcement shall be Type I, Type II, Type III, Type IV, or
Type V high tensile strength deformed steel fibers in accordance with ASTM A820 except as modified below .
a.Length . Fibers shall have a length of 1.0 inch to 1.5 inches with an aspect ratio (length divided by minimum width or diameter) between 40 and 80.
b.Tensile Strength . Fibers shall have a minimum tensile strength of 120,000 psi as determined in accordance with ASTM A820 . 7-59 SECTIO N 714 – STRUCTURA L STEEL 714.0 1 GENERA L REQUIREMENTS . Structural steel and other related materials shall conform to the requirements specified in this section . All main load carrying members and components of rolled or welded sections subject to tensile stress or the reversal of stresses, as well as any oth er members or components identified in the Contract as requiring CVN testing, shall meet the longitudinal Charpy V - notch impact requirements specified in AASHTO M 270 for non -fracture critical steel and fracture critical steel, for Zone 2. Impact test sampling and testing procedures shall be in accordance with AASHTO T 243 . All steel bolts, nuts, and washers furnished for Agency project s shall be manufactured in the United States only. All bolts, nuts, and washers furnished for a particular applica tion shall be furnished by a single supplier. All bolts, nuts, and washers shall have identifiable manufacturer’s markings on each piece. Nuts for galvanized fasteners shall be over -tapped a minimum amount to ensure fastener assembly. All galvanized nuts shall be lubricated with a lubricant containing a visible dye that will provide visual verification of the lubricant during installation. Black bolts shall be oily to the touch when installed. Bolts and nuts not properly lubricated shal l be cleaned and re -lubricated prior to installation. 714.0 2 STRUCTURA L STEEL . Structural carbon steel shall conform to the requirements of AASHTO M 270, Grade 36. 714.0 3 HIGH-STRENGT H LOW-ALLO Y STRUCTURA L STEEL . High -strength low -alloy structural steel with a 50 ksi minimum yield point up to 4 inches in thickness shall conform to the requirements of AASHTO M 270, Grade 50 or Grade 50W as required. 714.0 4 CARBO N STEEL BOLTS , NUTS , AND WASHERS . Carbon steel bolts shall conform to the requirements of ASTM A307, Grade A. Carbon steel nuts shall conform to the requirements of ASTM A563 . Carbon steel washers shall conform to the requirements of ASTM F844 . 714.0 5 HIGH-STRENGT H STRUCTURAL BOLTS AND ASSEMBLIES, 120 KSI. High -strength bolts shall meet the requirements of ASTM F3125, Grade A325, including rotational capacity testing, for each lot of fasteners. Heavy hex nuts shall conform to the requirements of ASTM A563 , Grade DH. Hardened steel washers shall conform to the requirements of ASTM F436 . Bolts installed in coated structural components shall be Type 1 and shall be provided with appropriate nuts and washers, as required. The combination of bolt, nut, and washer shall be mechanically galvanized in accordance with ASTM B695 , Class 55, Type 1. Bolts installed in uncoat ed weathering steel structural components shall be Type 3 and shall be provided with appropriate nuts and washers, as required.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 1209–1210 of 1,380.