Measurement of Reflected Solar Radiation of Urban Pavement Materials

This paper discusses the outdoor pavement materials used in cities inTaiwan and the amount of reflected solar radiation they release. Thestudy sample was comprised of a selection of high-pressure concrete slabs,divided into white and gray types. The white samples included white flattiles, iridescent crystal sandblasted tiles, sandblasted tiles and terrazzo tiles;and the gray samples include gray flat tiles, rustic tiles and permeable tiles,for a total of seven different types. A tool was developed in this study toaid in the screening of the sample from the external environment during themeasurement process, according to the design proposed by Sailor. It wasfound that for the white samples, the addition of waste glass resulted in noobvious increase in the reflectance of the samples. For the iridescentcrystal sandblasted tile, the reflectance of the white flat tile of the controlgroup without any admixture was 71-82 W/m2. However, after iridescentcrystal (waste glass) was added, the reflectance of the sample was reducedby 5-6 W/m2. It is obvious that the compressed concrete paving unitswithout treatment had the most efficient reflectance, and that it is unnecessaryfor them to be mixed with any components.