Thermoelectric coupling model for asphalt mixtures based on microwave heating

Abstract

In order to improve recycling quality of asphalt mixtures based on microwave heating, thermoelectric coupling theory is researched. Heat conduction equation is built according to Fourier's Law. Series model, parallel model and Maxwell model are studied to solve thermal conductivity of asphalt mixtures. Radiation field model of pyramidal horn antenna is set up and mean value of electric field intensity is measured by experiment. Thermoelectric coupling model is built on the basis of dielectric property of asphalt mixtures. Numerical simulation is performed for the model. It is found that influence of asphalt-aggregate ratio on temperature field is not distinct. Average temperature of asphalt mixtures is related to microwave power and increases with microwave power linearly. The asphalt mixtures using diorite as aggregate have a strongest adsorption capability to energy. The result can simulate hot in-place regeneration process, and has important significance to improve regeneration quality of asphalt mixtures.

Analysis of Reclaimed Asphalt Pavement Heating with Microwave Radiation

“…Research describing in uence on basaltic and siliceous-calcareous aggregates showed their susceptibility to microwave heating with slightly higher in uence on basalt (Benedetto and Calvi, 2013). On the basis of other studies, there was no effect of the increasing temperature of the aggregate by microwave radiation, e. g. quartzites and limestones (Sun, 2013;Trigos et al, 2020b), while heating of the bitumen containing polar fractions was observed (Norambuena-Contreras and Garcia, 2016). It is worth mentioning that the lower microwave frequency was used the greater penetration of heated materials was observed (Sun et al, 2016).…”

“…According to some sources, aggregates are a material susceptible to polarization and microwave heating (Trigos et al, 2020a), also dependent on the moisture content of the material and the aggregate origin (Al-Ohaly and Terrel, 1988). Some studies mark that only some aggregates are susceptible to the microwave in uence (Gulisano and Gallego, 2021) and among them we can point out andesite, ophite, blast furnace slag (Trigos et al, 2020b) and diorite (Sun, 2013). Research describing in uence on basaltic and siliceous-calcareous aggregates showed their susceptibility to microwave heating with slightly higher in uence on basalt (Benedetto and Calvi, 2013).…”

Microwave Heating as an Innovative Road Maintenance Technology: Aging Effect on Binder and Feasibility Evaluation

“…Compared with other heating methods (i.e., hot air, flame, infrared, electric coils, and hydronics), the microwave heating (MH) technique is considered as an innovative maintenance solution due to its rapid, uniform, non-polluting, and deep penetrating heating characteristics [ 3 , 4 , 5 ]. Microwaves are a form of electromagnetic waves in the frequency range of 300 MHz to 300 GHz [ 6 ], which generate a volumetric heating phenomenon [ 7 ].…”

Non-contact transient high-voltage measurement with self-integrating D-dot probe

“…The D-dot probe can sample transient voltage through electric field coupling to realize non-contact installation [14][15][16][17][18][19]. A difference input structure is presented to make the D-dot probe work in a selfintegrating mode.…”