A Study of Reflectance of Sandblasted Tile with Different Colors

This study discussed the reflectance of outdoor compressed concrete paving units. The research samples were basic square ground tiles, including sandblasted tiles with secondary treatment of surface, iridescent crystal sandblasted tiles mixed with waste glass, and rustic tiles. The ASTM E1918A method lately developed by the U.S. Lawrence Livermore National Laboratory (LLNL) was used for measurement. The measurement samples were square ground tiles in length and width of 20CM. The weather on the day was sunny, and the sunshine amount was greater than 800wa/m. The measurement site was the top of the 7th story of research building of Kuang-Fu Campus, National Cheng Kung University, Tainan City. The measurement environment avoided plants, buildings and persons shielding the samples, to avoid the measurement process being disturbed. This study suggests that in order to reduce the urban heat island effect, the white flat tiles without special treatment can be selected as the material for urban outdoor pavement design. Thus, the carbon emission from special treatment can be reduced, and a good reflectance effectiveness can be obtained. Keywordstainan City; sandblasted tile; iridescent crystal sandblasted; rustic tile; reflectance.