Effective Removal of Pavement Markings (2013) / Chapter Skim
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Pages 49-74
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49 As part of this research project, the removal of pavement markings was studied in the field. The field study consisted of two different study types.
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50 • High-pressure water blasting, current state-of-the-art fullsize truck system. • Combination testing.
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51 (see Figure 8) , and a charge-coupled device (CCD)
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52 road surface (light removal)
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53 full-size flailing truck and high-pressure water blasting techniques were observed in the field. There were no operations occurring where a dual removal technique (e.g., grinding followed by high-pressure water blasting)
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54 The height position and downward force of the removal unit, the forward velocity of the vehicle, and the condition of the removal heads were the major variables for the orbital flailing removal. Figure 15 provides an example of the flailing removal method on the closed-course PCC test deck.
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55 ing closely from a low angle and from directly above. These figures provide a visual look at the quality of the removal from the perspectives of the percentage of material removed and how the pavement surface was impacted.
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56 shows the etching of the surface that the water caused. At the edge of the removal area, the individual water jet paths can be seen, but in the center area, the removed area is smooth except for the slight indentations that were left from the diamond grooving.
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57 in similar scar depths that were less than those of the flailing method. The estimated texture depths were more variable across the removal types.
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58 Figure 21. High-build paint removal on asphalt.
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59 Figure 22. Thermoplastic removal on asphalt.
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60 a low angle and from directly above. These figures provide a visual look at the quality of the removal from the perspectives of the percentage of material removed and how the pavement surface was impacted.
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61 is excess material on the edges of the heavy high-pressure water removed area in Figure 24. Table 53 summarizes the data collected at the removal of the high-build paint and preformed thermoplastic markings on the asphalt deck.
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62 thermoplastic marking. The estimated texture depths were more variable across the removal types.
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63 a) High-Pressure Water Blasting b)
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64 c) Flailing Light (most removed)
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65 Figure 27. Thermoplastic removal on closed-course concrete pt.
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66 Figure 28. Thermoplastic removal on closed-course concrete pt.
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67 For the thermoplastic removal on the PCC surface, the high-pressure water blasting and combined removal resulted in the smallest difference from the surrounding road surface with regard to the retroreflectivity and measured brightness. None of the removal methods left any measurable scar, but the surface texture of the PCC was changed slightly depending on the removal method used.
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68 Appendix D, Figure D-1 and Figure D-2. The first figure represents the luminance along the marking at various distances when viewing the removed area looking toward the sun.
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69 six different sites were visited, and each presented a unique set of circumstances that provided beneficial findings to the research. Removal 1: Flailing Thermoplastic on PCC and Asphalt Members of the research team accompanied a contractor conducting night work on an interstate highway.
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70 water blasting system was used. The high-pressure water blasting system was used to remove newly installed thermo plastic markings on a new asphalt overlay.
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71 Removal 3: High-Pressure Water Blasting and Flailing Thermoplastic on Asphalt The same contractor also made the research team aware of a second area where his crew had recently completed a pavement marking removal project. At the next location, both a hand-operated flailing machine and a high-pressure water blasting system were used to remove thermoplastic on an asphalt surface.
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72 resulting surface changes were again better on this asphalt site compared to the controlled removal areas. The larger aggregate size and reduced amount of fines in the mix at this site likely reduced the ability of the removal system to remove the fines, like it did on the controlled test deck removal sites.
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73 removal. Any of the grinding techniques will also clean and polish the surface, resulting in a removed area that will stand out from the surrounding pavement surface.
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74 captured the results of this removal with video and pictures while driving through the work zone areas. Figure 44 provides an image of the removal area on a tangent section.
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