01519091

Component

The thermo-physical properties of conventional and modified asphalt and concrete pavements have been studied in order to understand their contribution to the Urban Heat Island. The emissivity, the albedo, and the solar reflective index was measured on three types of concrete (plain, rubber modified and surface-painted) and on four types of asphalt (dense bitumen macadam, polymer modified dense bitumen macadam, enrobe a module elevé and painted dense bitumen macadam ). An infrared camera, a pyranometer, a weather station and a set of thermocouples were used for data collection from an outdoor experimental set-up, as well as in a controlled laboratory environment. It was found that asphalt material releases superficial heat quicker than concrete, despite a higher aptitude to emit heat. The release of internal temperatures are slow in concrete during the day. The yellow painted paved surfaces generate a positive, although a different, reflective and cooling effects on both asphalt and concrete material. The painted asphalt surfaces are also less prone to heat up and remained colder during the day, although the degradation of paint by weathering has adverse effect on cooling effect. On the other hand, rubber modified concrete appears to have better resistance to weathering for lowering the surface temperature. The more widespread use of painted surfaces could be considered a helpful approach to the design of urban paving and its management to combat the Urban Heat Island phenomenon.

This paper was sponsored by TRB committee AF000(2) Pavement Materials and the Urban Climate.

01503729

14-3205

English

12p

2014

Transportation Research Board 93rd Annual Meeting

Digital/other

Figures; Photos; References; Tables

Asphalt pavements; Concrete pavements; Data collection; Paving materials; Surface temperature; Weathering

Urban heat island

Highways; Materials; Pavements; I30: Materials

Transportation Research Board Annual Meeting 2014 Paper #14-3205

TRIS, TRB, ATRI

Jan 27 2014 3:06PM