The report describes a pavement reflectometer which can measure the luminance variations, the absolute reflectance, as a function of the oblique illumination incidence angle. A group of seven bituminous and Portland Cement concrete samples were investigated. The following conclusions are drawn: (1) Within present lighting practice, the specular reflective quality of pavements 'does not seem to warrant further exploration,' (2) diffused pavement reflectance seemed to be more desirable, (3) P. C. concrete should be burlap dragged or bituminous concrete should be rolled with soft rubber tires to produce optimum aggregate exposure if vehicular lighting is to be the main source of luminance, (4) where fixed lighting systems (which employ current practice) are to be installed, a dominantly specular pavement surface should be chosen. (BPR abstract)
Description of a Pavement Reflectometer and Some Comparison Reflectance Measurement of Pavements
1967
55 pages
Report
Keine Angabe
Englisch
Civil Engineering , Optics & Lasers , Pavements , Reflectometers , Concrete , Bituminous coatings , Measurement , Cements , Illumination , Surfaces , Reflectivity , Sampling , Light , Visibility , Lighting equipment , Roads , Photometers , Tables , Photographs