PAVEMENT MARKING REMOVAL
Care must be exercised in selecting the correct method. The method chosen must match the pavement surface. The wrong method used on a given road surface can result in a permanent scar to the pavement. No matter which removal method is used the removal equipment must be able to vacuum its own debris while in operation.
High pressure water to remove existing markings or curing compound from concrete
The truck mounted waterblaster must be capable of vacuuming the spent water and debris as it goes, leaving the pavement clean and only slightly damp. With a skilled operator, waterblasting causes the least amount of scarring on concrete surfaces and should be the only removal method allowed to remove longitudinal pavement markings off concrete pavement that is to remain in place.
The fastest, lowest cost method for removing pavement markings
Types of Pavement Marking Removal:
Longline removal – The removal of longitudinal markings such as roadway centerlines and edge lines – is accomplished by using a grinder truck equipped with multiple grinding heads that can remove an existing line with one pass of the truck. The grinder truck needs to be capable of vacuuming the debris generated simultaneous to the grinding operation. Because some degree of scarring occurs with grinding, it is critical to minimizing scarring by using the correct head/tooth configuration considering the condition and type of pavement. Grinding is best to use on asphalt pavements or pavements that will be removed or repaved during construction or when removing a marking that will be replaced with a new marking in the exact same location.
Special markings removal – The removal of legends, symbols, crosswalks and stop bars – is accomplished by using self propelled equipment much smaller in size than a truck (usually about the size of a lawn tractor) that is equipped with a grinder head. The machine must be capable of vacuuming the debris generated simultaneous to the grinding operation. Because some degree of scarring occurs with grinding, it is critical to minimizing scarring by using the correct head/tooth configuration. Grinding is best to use on asphalt pavements or pavements that will be removed or repaved during construction or when removing a marking that will be replaced with a new marking in the exact same location.
Below are examples of the Grinding Method after Pavement Markings have been removed. The line is completely gone with minimal scarring.
STEEL SHOT TO “BLAST” OFF EXISTING MARKINGS
Shot blasting is a removal process whereby steel shot strikes the pavement surface at a very high rate of speed to remove the pavement marking or curing compound material. The steel shot is continually vacuumed and recycled by the machine for continual use. It is a slow method of removal and is best when used in conjunction with a grinder. The grinder removes 90% of the marking while the shot blaster is responsible for removing the last 10%, thus reducing scarring. This method is referred to the Grind / Shot Blast Method.