314250.02—Materials
a.Carbon Fiber Mesh Materials shall conform to the following: The carbon fiber mesh is comprised of high tensile strength carbon fiber strips 4 inches in width. The mesh is not impregnated, wets out with the epoxy, and cured in place in epoxy resin overlay. General Information Constituent Materials: 6K Carbon Fiber unidirectional tows Primary Fiber Directions Closed knit 0° X 90° Color Black Carbon Material Properties Requirement Test Method Nominal Thickness 0.030 inch Nominal Tensile Strength per unit width 400,000 psi ASTM D3039 Nominal Tensile Modulus 33,000,000 psi ASTM D3379 Failure Strain 1.3% ASTM D3379 Grid Spacing 1/4” x 1/4” (inch) (longitudinal x transverse) SECTION 251 - GAL V ANIC ANODES
251.01 Description
These specifications cover galvanic anodes used to minimize corrosion between the interface of existing concrete and concrete repair materials.
251.02 Detail Requirements
Anodes shall come pre-manufactured and be supplied with integral tie wires for connecting to the reinforcing steel. Tie wires shall be in accordance with ASTM A82. Anodes shall contain no corrosive constituents or substances detrimental to reinforcing steel. The material covering the zinc metal shall be inert to fresh concrete and cover the entire zinc material so that the zinc material is protected from coming into direct contact with the reinforcing steel. Metallic zinc used in the anodes shall be in compliance with ASTM B418 and shall not contain more than the following impurities: Copper 0.01 % maximum Lead 0.003 % maximum Iron 0.015 % maximum Cadmium 0.003 % maximum250.02 315Individual anodes shall provide a current density output equal to or greater than 0.05 µA/cm2 (0.32 µA/ in2) at 10 years, based upon manufacturer’ s recommended steel surface area for placement. The anodes shall be designed and installed such that the anode has the same embedment depth as the reinforcing steel to which it is attached. Anodes shall be delivered, stored, handled, and installed according to the manufacturer’ s instructions. SECTION 252 - GRA VITY -FILL POL YMER CRACK SEALERS
252.01 Description
These specifications cover polymers used for gravity-filling sealing cracks in hydraulic cement concrete surfaces.
252.02 Materials
Gravity-fill polymer crack sealers shall be a high molecular weight methacrylate, epoxy, or urethane conforming to the following: Properties of Gravity-filled Polymers Property @ 75 ± 5 °F Test Method Requirement Gel Time, 50 ml sample ASTM C881 6 hrs. max. Tensile Strength ASTM D638 1,500 psi min. Sand Penetration, MX-45 sand VTM 101 80% min.252.02
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 342–342 of 1,065.