Tack Application Requirements Clause Samples

Tack Application Requirements. The tack coat material shall be applied by a pressure distributor. All nozzles on the distributor shall be open and functioning. All nozzles shall be turned at the same angle to the spray bar. Proper nozzle angle shall be as determined by the manufacturer of the distributor spray bar. The spray bar shall be adjusted so that it is at the proper height above the pavement surface to provide a double overlap spray for a uniform coverage of the pavement surface. A double lap application requires that the nozzle spray patterns overlap one another such that every portion of the pavement receives spray from exactly two nozzles. When an HMA pavement course is placed on an existing tight smooth pavement surface, Tack coat to be applied @ .05 gallon per square yard. Tack coat shall be applied to cover approximately 90% of the pavement surface. In addition to the requirements above, all vertical surfaces of curbs, match joints, edging, utilities, and drainage structures shall receive a thorough tack coat application immediately prior to placing HMA pavement course.