Spray patching is “the most economical and longest lasting method of pothole repair.” – The National Research Council’s Strategic Highway Program (SHRP)
Spray injection patching is a specialized repair process that combines hot asphalt emulsion and crushed aggregate using forced air. Spray injection patching is very versatile in the types of repairs that can be done! It is not only an exceptional repair method for potholes, you can repair alligator cracks, cupped cracks, areas that are raveling, high iron and any other type of repair where you would use traditional asphalt. This type of repair can easily be used on concrete as well.
Schwarze spray patch equipment consists of an aggregate hopper, hot asphalt emulsion tank and a high volume blower which is all mounted on the same piece of equipment. There are two types of machines: Trailer mounted and Truck mounted. The trailer mounted machine takes a 2 to 3 person crew to operate the equipment; the truck mounted machine needs only one person to operate the equipment.
The cost savings is apparent right from the start, 2 men is all that you need to place approximately 8 tons of material with the trailer patcher while 1 man can place 12 tons of material with the truck. Besides labor, cost savings are realized by the longevity of the repair. The average spray patch lasts 4-7 years.
The Roadpatcher utilizes a four-step process to complete pothole repairs. First, a blower uses compressed air to clean debris from the pothole and surrounding cracks. Second, the area is tacked with a hot asphalt emulsion to provide adhesion to the existing pavement. Next, the pothole is filled with a combination of the aggregate mix and the hot asphalt emulsion at a velocity that provides a 90% compaction rate. Finally, a dry coat is applied and the repair can be driven over by traffic immediately.
Spray patching can be done year round as long as you have a supply of aggregate and RS-2 emulsion. Cold weather is also when the cost savings really start to add up. The repaired area will withstand the freeze-thaw movement of pavement. It does not deteriorate or break out. There are not hard edges for the snow plows to catch the patch and it will stay in place. Even when the temperature is below freezing, you will not have to go back time and time again to the same pothole.
If safety for your work force is a concern, the truck mounted unit is the answer! One person can work from the safety of the cab and still place approximately 12 tons of “HOT” material. The trucks are equipped with their own arrow-board and a crash cushion can be easily added.