Specifications include, but are not limited to: 2.1.The Agency of Transportation Railroad Division requires precast concrete panels for railroad grade crossing surface, including all hardware required to attach the panels at a rail-highway crossing 2.2.This includes furnishing new precast concrete panels with elastomeric, non-conductive filler or boot along entire base for the full length of the crossing to insulate the rails from the concrete. 2.3.Materials and Dimensions: 2.3.1. The precast concrete crossing panels to be furnished shall be an approved system cast by an approved manufacturer. 2.3.2. The Manufacturer shall provide lag-type shunt resistant precast concrete panels using a minimum of 6000 psi concrete and American Grade 75 reinforcement. Each panel shall have a 3 inch x 3 inch x 1/4 inch angle with a 3 mil rust inhibitive coating. 2.3.3. Each panel shall be manufactured to meet HS20-44 loading in accordance with AASHTO Standard Specifications for Highway Bridges, with a 30% impact increment. Loadings shall be based on a single axle load of 32,000 lbs (16,000 lbs per side). 2.3.4. Design calculations shall be certified by a Professional Engineer registered in the State of Vermont. 2.3.5. Each panel shall have a non-skid surface and be protected from freeze/thaw cycles, deicers, and other contaminates using 4 to 6 percent air entrainment. 2.3.6. Each gage panel shall be 50-1/2 inches wide x 108 inches long manufactured to the correct height for the rail size specified. Gage panel height shall be flush with top of rail. Gage panels shall have a 3 inch gap at each end of the frame with a non-conductive polyethylene shield. 2.3.7. The field panels shall be 27 inches wide x 108 inches long. Field panel height shall be flush with the top of rail. The dimensional tolerances for each panel shall be ± 1/8 inch. Field panel height shall be flush with the top of rail. 2.3.8. The precast concrete crossing system shall also have a minimum 1/4 inch steel end deflector shield at each end. 2.3.9. The crossing panels shall be manufactured to be compatible with all rail fastening hardware and rail anchors. 2.3.10.The field and gage panels shall have recessed timber screw holes to protect the timber screw heads from vehicular wheel impact. 2.3.11.Each panel shall have two (2) galvanized recessed lifting eyes with a minimum of 4,000 lbs lifting capacity. 2.3.12.A minimum 1/8 inch elastomeric bearing pad shall be installed between the top of the timber cross tie and bottom of the concrete panels. The elastomeric bearing pad shall follow AREMA specifications for nonconductive rubber and shall meet ASTM D412 strength and ASTM D2240 hardness requirements.
