THERMOPLASTIC ROAD MARKING

THERMOPLASTIC ROAD MARKING

 

1.General

The methodology for laying of Thermoplastic paints in this project is detailed here in under

 

Technical Information:

Composition                                     :           As per MOSRT&H Cl.803.4

Colors                                                :           White

Drying Time                                      :           5 to 10 Minutes

Luminance 45deg. Angle (% min)            :           65

Skid Resistance                               :           45

 

Application Data:

Road Temperature                           :           >10⁰ C

Typical Heating Temperature        :           180 to 210⁰ C

Optimum Heating Temperature     :           190 to 200⁰ C

2.Procedure

Before commencing the Road Marking Activity, the pavement temperature shall not be less than 10 deg centigrade. The asphalt surface shall be thoroughly cleaned with mechanical or with manual broomer / air compressor for all dust, dirt, grease, oil and all other foreign matter before application of paint. After cleaning the road, with the help of white marker / chalk mark the offsets at an every interval of 50m and at curve portion at every 20m interval. With the help of a string line / thread fix the offset and nailed it at every 50m / 20m interval. The offsets for paint marking is as per drawings and technical specifications. The minimum thickness for marking the paint shall be at least 2.5mm and minimum width will be 100mm. At kerb and shoulder edges the lines shall be continuous. At center it would be 3m length markings with 6m gaps on straight portions. For median opening, super elevation, bus shelters, service roads, Toll plaza and at Junctions the road markings shall be followed as per the drawings. Where letters or arrows are to be provided thermoplastic compound may be hand sprayed.

As per the MOSRT&H specification the thermoplastic material along with glass beads shall be melted uniformly with no evidence of skin or un melted particles. Now the thermoplastic material shall be poured in to the road marking machine or screed application machine it shall be placed over the string and adjusting the thickness to 2.5mm at least (excluding glass beads) and machine shall be moved slowly, a further quantity of glass beads of TYPE-2, conforming to the specification shall be sprayed uniformly into a mono-layer on to the hot paint line in quick succession of the paint spraying operation. The glass beads shall be applied at the rate of 250 grams per Sqm. Area.

The finished lines shall be free from ruggedness on sides and ends and be parallel to the general alignment of the carriageway. The upper surface of the lines shall be level, uniform and free from streaks.

Once the paint marking completed request for inspection of thickness and width as per drawing should be issued.

Care shall be taken to prevent the traffic flow while laying the paint mark.