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Abstract: Induction heating of asphalt concrete is a technique that has been recently developed to increase the self-healing rates of asphalt concrete. It consists in adding electrically conductive fibers to the asphalt mixtureand heating them with an induction heating device. In this way, the temperature of asphalt concrete canbe indirectly increased. But still, the factors that affect the increase of temperature are not well-known.With the purpose of finding them, 25 different mixtures, with the same aggregates distribution andamount of bitumen, but with two different lengths, four different quantities, and four different diametersof steel wool fibers have been considered. The influence of fibers on the air void content, electrical andthermal conductivity of dense asphalt concrete has been studied. Furthermore, the effect of these prop-erties on the maximum temperature reached after a fixed time induction heating is analysed. It wasfound that steel wool fibers increase slightly the electrical and thermal conductivities of dense asphaltconcrete. Additionally, in the case of the thermal conductivity, an increase on the volume of steel woolfibers serves to compensate the loss in the thermal conductivity that happens when the air void contentis increased. Finally, it has been observed that the temperature reached due to the induction heatingincreases with the number of fibers in the mixture and with their diameter. As a recommendation, itis indicated that, for induction heating purposes, short fibers, with big diameters should be used
Fuente: Construction and Building Materials, 46, 48-54
Editorial: Elsevier Ltd
Año de publicación: 2013
Nº de páginas: 7
Tipo de publicación: Artículo de Revista
Url de la publicación: https://doi.org/10.1016/j.conbuildmat.2013.04.030
JOSE ERNESTO NORAMBUENA CONTRERAS
PARTL, MANFRED N.