Are standard tables r still representative of the properties of road surfaces in france?
The reflection properties of the pavement must be taken into account when designing a road lighting installation, to ensure luminance level and uniformity. In France, the standard r-tables of the CIE system R are used for that purpose. These tables are characteristic of pavement materials which were used decades ago. In the 90s, a first study on porous asphalt showed that they might no longer be relevant to deal with modem road surfaces. In 1999, the study was pursued on very thin asphalt concrete (VTAC) and surface dressing (SD). Different formulas, with different aggregate gradations and colors, were laid on two road sections with similar traffic. Samples were taken over a period of three years, to have their r-tables measured with a CIE compliant goniophotometer. The photometric data was analyzed in terms of lightness and specularity to estimate the influence of time and formula. VTACs start with a very high specular value which decreases rapidly during the first few months, and end up fairly or slightly specular after three years. On the opposite, SDs are diffuse at first, and end up more or less specular. Discrepancies were also found between the measured and the corresponding standard r-tables, even after reseating the latter to match the average luminance coefficient values.
road lighting road surface pavement material luminance coefficient r-table lightness specularity very thin asphalt concrete surface dressing.
Dumont, Eric Paumier, Jean-Luc
Laboratoire Central des Ponts et Chaussées, Paris, France Laboratoire Régional des Ponts et Chaussées, Clermont-Ferrand, France
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
802-805
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）