Standard Practice for Evaluating Retroreflective Pavement Markings Using Portable Hand-Operated Instruments

Importancia y uso:

5.1 This practice provides procedures for the determination of the retroreflective performance of pavement markings. This practice does not set the minimum retroreflectance values for pavement markings; it describes sampling criteria for determining the retroreflective properties of pavement markings, which then can be used to determine compliance with a specification. It is the responsibility of the agency having jurisdiction to set the acceptable retroreflectivity values within their own specifications.

5.2 This practice does not purport to address all the concerns regarding contamination of the markings, but the following may be helpful. It is very important that the markings being evaluated are clean and dry. If the evaluation is being used relative to a measure of the performance of a contractor, it is imperative that the parties agree beforehand on the definition of clean and dry. There are many forms of contamination on a roadway that will lower the retroreflectivity readings of a marking, but not all of them can be removed. Asphalt oil and rubber skid marks are examples. Loose dirt can be removed by pressure washing, perhaps using soap, brushing, or high-pressure air; however, these techniques are usually insufficient to remove dirt that is packed into the marking surface. Care should be taken to select areas that are typical of the marking section, avoiding areas of paint tracking or contamination, for example. It may be useful to take photographs using a digital camera and a good macro lens to be able to see the contamination on or between the glass beads.

Subcomité:

D04.38

Referida por:

D6628-23, D8584-24, D7942-15R23

Volúmen:

04.03

Número ICS:

93.080.20 (Road construction materials)

Palabras clave:

pavement markings; retroreflection;