6-1 Division 6
ASPHALT PAVEMENTS
600-1 Description
Perform the work covered by this section including, but not limited to , treating an existing non-asphalt base course with asphalt material by furnishing and applying the prime, furnishing and placing granular material to protect the prime and maintaining the prime coat in accordance with these s pecifications . Treat all non -asphalt bases beneath an asphalt surface treatment with a prime coat.
600-2 Materials
Refer t o Division 10. Item Section Prime Coat Materials 1020 -5 Use materials for prime coat application that are on the APL for prime coats available on the Department’s website. Where the grade of prime coat material is not established by the contract, the Contractor may select the grade to be used from the APL . All prime coat materials shall be delivered to the project ready for use.
600-3 Weather Limitations
Apply prime coat only when the surface to be treated is free of standing water, at proper moisture content and the atmospheric temperature measured at the location of the operation away from artificial heat is 40 °F or above for plant mix and 50°F or above for asphalt surface treatment. Do not apply prime coat on a frozen surface or when the weather is foggy or rainy.
600-4 Base Preparation
Clean the base of objectionable debris, excessive dust and any other deleterious matter before placing the prime coat. When directed by the Engineer , dampen the surface of the base before application of the prime coat.
600-5 Application Equipment
Provide, maintain and operate a pressure distributor that is designed and equipped such that the asphalt ma terial remains at a constant temperature and is applied uniformly on variable widths of surface at predetermined and controlled rates. Use a distributor equipped with a tachometer or synchronizer, pressure gauges, accurate volume measuring devices or a calibrated tank and a mounted thermom eter for measuring temperature. Use a distributor equipped with a power driven pump of sufficient capacity to distribute the required quantity of asphalt material at constant flow and uniform pressure. Provide a full circulation spray bar adjustable laterally and vertically and adjustable in length to conform to the required width of application without overlapping. Provide and maintain nozzles designed to provide equal and uniform application at all times. Provide a ha nd spray hose and nozzle