The raising of temperatures nowadays has become a critical issue,especially in urban areas due tothe phenomenon of theUrban Heat Island effect(UHI). Asphalt pavement temperatures increase due to the solar radiation, which contributes towardsthis effect.The concept of cooling the pavement surface is possible bymeans ofatemperature controlled asphalt pavement.This concept will lead to a reduction ofthe surface temperature and subsequently a decrease of the temperaturesin the surrounding urban areas during warmseasons. Thus, it will relieve the Urban Heat Island effect. For this paper the concept of temperature controlled asphalt pavement has been proposed. Theoretical consideration has been made and a numerical modelling is presented.

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Improving durability of asphalt pavement by means of Hydronic Pavement

Inestroza Mercado, Arsel Isel; Hess, Rainer

The asphalt pavement lifetime is strongly influenced by the variation of material temperatures; during the summer, thesurface of asphaltlayers couldreach up to 70°C[1],which causes the formation of ruts in the surface while in winter, at low temperatures,thermal cracking takes place.These distresses lead to decrease service life of the asphalt pavementand, as a consequence,increase the cost for maintenance,because of early replacement.There are different possibilities to keep material temperatures oscillating in a specific temperature span, and as a consequence, the formation of rutting and thermal craking can be significantly reduced and,therefore , the durability of the asphalt pavemente is enhanced[2][3].Studies focusing on temperature control through Hydronic Pavements by means of a network of embedded pipes within the layer structure, found that desired material properties are contrarious . Since the materials are responsible for the transport of energy, their thermal propertiesneed to be taken into account[2]. The aim of this contribution is to propose a concept for Hydronic Pavement that can enhance the durability of asphalt pavement with a suitable mix design that provides an appropiate balance between the thermal conductivity and absorptive capacity of the asphalt material. Full Paper .