Placing an ultrathin lift often requires a tack coat to make sure you get a good bond to the existing pavement. Then you don’t want a haul truck picking up tack on his tires and leaving inconsistent spots in your mat. Contractors who want to simplify the process can turn to Roadtec for the SP-200 Spray Paver™ that sprays tack seconds before laying mix. Of course, you may need to switch to paving without tack, and there’s no point in switching out the paving train for that when the SP-200 can perform conventional paving as well.
An operator loads liquid tack into the 2,100-gallon tank before the paving operation begins. A 500,000-btu heater heats a hot oil system, which keeps the tack in the tank at the proper temperature.
The spray bars extend as needed with the screed and each nozzle can be manually shut off for partial passes.
For the final steps, and for conventional paving at any time, a material transfer vehicle (MTV) delivers mix directly to the SP-200 gravity-fed hopper, which has a capacity of 11 tons. The 14- by ¾-inch spreading augers deliver the mix to the Eagle 10™ hydraulically extendable, vibrating screed.