Influence of asphalt composition upon the thermodynamics performance of a mixing plant

Pavement material production requires a highly intensive energy processing related to the drying and the heating of granular materials within a rotary kiln. Thus, a better prediction of thermophysical parameters of bituminous concrete materials during their transformation is required to improve the...

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Bibliographic Details
Published in:	Road materials and pavement design Vol. 19; no. 1; pp. 104 - 119
Main Authors:	Huchet, F., Le Guen, L., Richard, P., Piton, M., Cazacliu, B., Semelle, P., Matheus, J., Riche, H., Tamagny, P.
Format:	Journal Article
Language:	English
Published:	Abingdon Taylor & Francis 01-01-2018 Lavoisier
Subjects:	Asphalt bituminous binder Drying Engineering Sciences Environmental impact feeding system Granular materials Materials Moisture content Position measurement Recycled Asphalt Products Recycled materials rotary kiln self-ignition Temperature sensors Thermal degradation Thermodynamics RECYCLED ASPHALT PRODUCTS LIANT BITUMINEUX FEEDING SYSTEM ENROBE MATERIAU SELF-IGNITION FOUR ROTATIF LIANT AUTO-INFLAMMATION BITUMINOUS BINDER ROTARY KILN RECYCLAGE DES MATERIAUX
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Summary:	Pavement material production requires a highly intensive energy processing related to the drying and the heating of granular materials within a rotary kiln. Thus, a better prediction of thermophysical parameters of bituminous concrete materials during their transformation is required to improve the processes in order to reduce their environmental impact. The present paper deals with accurate thermodynamics balance in a mix-asphalt plant. We report input and output mass flows captured within an instrumented flight rotary kiln devoted to a large range of asphalt materials. Hot-mix (T materials ∼170°C), warm-mix (T materials ∼120°C) and Recycled Asphalt Products (so-called RAP) are compared. Computation of the macroscopic energy balance exhibits an averaged energy flux source equal to about 7 MW, the major amount being connected to the power gas burner. The heat sink related to the drying is different according to the formulation, RAP particles having non-negligible moisture content. In situ temperature sensors are used to validate an advanced thermodynamics model involving RAP feeding rate. The thermal degradation of the RAP particles emphasises significant heat release measured at the RAP injection position which is captured by the theoretical model.
ISSN:	1468-0629 2164-7402
DOI:	10.1080/14680629.2016.1249018