ABSTRACT
This paper provides an overview of the asphalt concrete pavement material properties that affect surface temperatures and hence influence their contribution to the urban heat island (UHI) effects. Its goal is to analyze the effect of alternative aggregate materials, such as limestone, silica, polymer, glass, and graphite, have on asphalt concrete pavement surface temperatures under various environmental conditions. Pavement surface temperatures were analyzed for two extreme weather locations in the USA, namely South Texas and Northern Minnesota. LTPP weather data over a year-long period, were analyzed for each location using the computer model TEMPS. Minimum and maximum pavement temperatures were compared at a depth of 0.01 meter. It was concluded that the higher the coefficient of thermal conductivity, the heat capacity and the albedo of the asphalt concrete layer, the lower the average and maximum surface temperatures are throughout the year. Various aggregate substitutes are currently under consideration as limestone aggregate substitutes.
