Specifications include, but are not limited to: Material. The sealant used shall be hot-applied asphalt based product. The material used should be Crafco RoadSaver 221 or an approved equal. The material used shall meet the requirement of ASTM D6690 (ASSHTO M324), Type IL "Joint and Crack Sealants, Hot-Applied, for Concrete and Asphalt Pavements".
Equipment. The equipment provided shall be safe and in good repair (as determine by the Engineer on a day-day basis), adequate in size to accomplish the work, and conform to the sealant manufacturer's recommendations.
Air Lance. A hot compressed air lance capable of providing clean, oil-free
compressed air at a volume of 100 cfm, a pressure of 120 psi, and a temperature of 2000'F (1 100'C).
Application Wand. A wand attached to a heated hose attached to a heated material
chamber that maintains material temperature within manufacturer's tolerances. The wand tip shall be selected which provides the desired finished profile as shown in the attached detail. Approval of the tip by the Engineer will be based on a demonstration that the tip can provide the desired finished profile. Material flow through the application wand shall be controlled with a toggle switch or in-line valve. Pour pails are not acceptable.
Heating Kettle. The Heating kettle shall be an indirect-heating double boiler capable
of constant and effective agitation that promotes proper mixing and maintains uniform heat distribution throughout the kettle. The unit must be capable of heating the material within a range that meets the sealant manufacturer's recommendations. The unit must include an easily read and accurate thermometer to insure the sealant is not heated to a temperature in excess of that specified by the sealant manufacturer.
Crack Preparation. Cracks shall be cleaned, dry and free of dust, dirt, loose material, foreign materials, including grit, debris, weeds, old sealant, trash, standing water and/or moisture along the sidewalls of the crack. The crack channel shall be cleaned, heated and dried with a hot compressed air lance within (10) minutes of the application of the sealant. The foreign material resulting from crack preparation shall be removed from the roadway before an area is opened to traffic.
Sealant Application. Asphalt crack-sealing material should not be applied when the pavement surface is wet or when the temperature of the pavement surface is less than 40'F without the approval of the Engineer. The sealant should be applied to fill the crack from the bottom to the top in order to prevent air bubbles from forming and creating a point of weakness in the sealant. Application of the sealant material shall be made in such a way as to completely fill the crack to the desired profile (a slightly recessed flush fill). To the satisfaction of the Engineer or Inspector, care shall be taken to keep extraneous hot-pour material off adjacent pavement surfaces. Blotting material shall be available on-hand in case of a spill or significant over-pour.