line marking and trip hazard removal
Line marking removal methods
There are a number of ways pavement markings can be removed. Retro Roads offers the following methods:
High pressure water blasting
The method of removing line making by "black out" simply involves apply black paint to existing markings. This arguably the most economical removal type but is not a permanent solution as eventually the black paint wares away in high traffic areas. Main Roads specification 604 excludes it for use on state roads, which means it can only be utilised on private property.
Mechanical grinding utilises equipment fitted with carbide cutter that spin at high revolutions to cut/grind away at the pavement. This method is a permanent method to pavement marking removal and is capable of removing all forms of line marking. Mechanical grinding can also be used to remove trip hazards found in concrete footpaths. Mechanical grinding is easily mobilised to site.
Shot blasting is similar to sand blasting. Small metal beads, or shot are propelled at the surface of the road way at high speed to remove the pavement marking. Shot blasters are self contained as the shot is vacuumed up immediately after it hits the pavement. Shot blasters can not be used on wet surfaces and are ineffective in the removal of thermoplastics.
The water blasting, also known as hydro blasting, is a process that uses high pressure water, typically between 34,000 and 40,000 psi to clean the surface, remove old coatings, prep a surface for a new application and remove rubber from runways. Water blasting can remove all types of pavement marking, including thermoplastic and tape.