for Highway Construction Page 196 of 715 SECTION 400 – SURFACE COURSES AND PAVEMENT Protect private property , bridges, sign posts, guardrail , and other roadway structures from being discolored by asphalt . If structures become discolored by asphalt, remove the discoloration. Repair or r epaint surfaces, if required. Apply asphalt at the temperature recommended by the supplier. for Highway Construction Page 197 of 71 5 SECTION 401 – TACK COAT
401.01 Description.
Prepare and treat an existing surface with asphalt .
401.02 Materials.
Provide asphalt of the type and grade specified. Provide asphalt as specified in 702 . The Engineer will accept the asphalt at point of delivery.
401.03 Construction Requirements.
Provide distributor equipment as specified in 406.03. Patch and clean the existing surface and ensure it is without irregularities to provide a reasonably smooth and uniform surface to receive the treatment. Remove and replace unstable corrugated areas with suitable patching materials. Clean the edges of existing pavement that are to be adjacent to new pavement to allow adhesion. Broom before applying tack coat . Provide brooms that are in good condition and capable of sweeping a path at least 70 inches wide without loosening or displacing embedded m aterials. Sweep the surface as directed. Accompany each broom by a shadow vehicle if working on highways open to traff ic. Equip the shadow vehicle with at least 1 roof -mounted high intensity rotating or strobe- type amber flasher that is readily visible from front and rear for 0.5 mile. Lightly spray the surface of the roadway to be swept with enough water to prevent broom ing operations from creating dust to the extent that it would violate air pollution regulations or create a safety hazard. Do not broom from the surface onto maintained shoulder -foreslope areas where the adjacent property owner cares for the area and maintains turf or landscape. Apply asphalt tack so the application is uniform, the limits of placement are appropriate, there is the least amount of inconvenience to traffic, and traffic will not cause pickup or tracking. Mix approximately equal volumes of emulsified asphalt and water before application. Do not apply asphalt if surface or weather conditions can prevent proper construction.
401.04 Method of Measurement.
The Engineer will measure acceptably completed work for the tack coat as diluted emulsified asphalt by the gallon with no correction for temperature.
401.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: Pay Item Pay Unit ____ Diluted Emulsified Asphalt for Tack Coat ....................................... gal The Department will not pay for reapplication of the asphalt tack required due to time lag between the initial application and the paving oper ation.