Page 557981 GLASS BEADS
981.1 General Requirements
Glass beads for use with pavement marking paint will be moisture resistant and will meet the requirements of AASHTO M 247, Type II. The glass beads will be without floatation properties. The glass beads will have dual surface treatment consisting of a moisture resistant silicone treatment, and silane adherence surface treatment. The glass beads will have a minimum of 80% true spheres. Roundness will be tested in accordance with SD 510. Page 558982 MATERIALS FOR HIGHWAY SIGN AND DELINEATORS
982.1 General Requirements
A Certificate of Compliance will be furnished for each material item and will state that the item conforms to the required specification, with reference being made to the appropriate specification number.
982.2 Specific Requirements
A.Signs: 1.Sheet Aluminum: Sheet aluminum will meet the requirements of ASTM B209 for alloy 5052- H38 or alloy 6061-T6. The aluminum will be properly degreased and etched or treated with a light, tight, amorphous chromate coating. Sheet aluminum thickness requirements will be based on the maximum horizontal in place dimension of each sheet aluminum sign in accordance with the following: Horizontal Dimension of in Place Sign BlankRequired Sign Blank Thickness 30 inches and less 0.080 inch Over 30 inches 0.100 inch Sheet aluminum for signs used to overlay other sign surfaces will have a thickness of 0.063 inch. Cutout aluminum backing for removable letters, numerals, symbols, and borders will be a minimum of 0.032 inch thick aluminum sheet of alloy 6061-T6 or alloy 3003-H14. Route markers for use on guide signs will be 0.063 inch thick aluminum sheet of alloy 6061-T6. The sheared edges of blanks will be straight and free from tears and raggedness. 2.Extruded Aluminum: Extruded aluminum will meet the requirements of ASTM B221 for alloy 6061-T6 or alloy 6063-T6. No more than one 6 inch wide panel will be used in any sign. 3.Sign Molding: Side trim molding will be an aluminum extrusion designed for the sign panel extrusion with which it is used and will conform to ASTM B221 for alloy 6063-T6 or alloy 6061- T6. The sign molding will be of the same color as the sign face it accompanies. 4.Connections: U Clamp connections will be fabricated from ASTM A36 steel. The steel will be galvanized in accordance with ASTM A123. Fabrication will be completed prior to galvanizing. Z-bars and Angles used to mount sheet aluminum signs will meet the requirements of ASTM B308 for alloy 6061-T6. Post clips for wide flange posts will meet the requirements of ASTM B108 for alloy 356.0-T6. Bolts, nuts, and washers for mounting signs to aluminum backing hardware will be aluminum, conforming to the following:
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