721 RAISED PAVEMENT MARKER MATERIALS

721.00 General. Products meeting these specifications are identified on a qualified product list kept on file by the Laboratory.

721.01 Raised Pavement Marker Castings. Ensure that the casting is nodular iron according to ASTM A 536, hardened to 45-54 RC, snow plowable in the two opposing longitudinal directions and designed to accommodate a replacement prismatic retroreflector

Furnish materials according to the Department’s Qualified Products List (QPL).

721.02 Prismatic Retroreflector. Furnish reflectors that contain one or two prismatic reflective faces to reflect incident light from a single or opposite directions. Furnish reflectors with nominal dimensions of 4 ´ 2 ´ 0.48 inch (100 ´ 50 ´ 12 mm). Ensure that the reflector fits securely in the recessed area and does not protrude above the profile of the casting.

Furnish materials according to the Department’s Qualified Products List (QPL).

721.03 Casting Adhesive. Furnish adhesive according to AASHTO M 237, Type IV, except that the viscosity is 200 to 900 poise at 77 + 2 °F (25 + 1 °C) and the unit weight is 11.3 to 11.9 pounds per gallon (1.35 to 1.43 kg/L).

Furnish materials according to the Department’s Qualified Products List (QPL).

721.04 Prismatic Retroreflector Adhesive. Furnish adhesive to bond the prismatic retroreflectors to castings.

Furnish materials according to the Department’s Qualified Products List (QPL).