Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to a method for accurately evaluating a hot in-place recycling heating effect of an asphalt pavement based on a discrete element method, belongs to the technical field of hot recycling of the asphalt pavement and aims at solving the problem that the evaluation of the hot in-place recycling heating effect of the asphalt pavement is not accurate. The method comprises the following steps: firstly taking a core out of the pavement, defining the structural combination of the pavement and the type of gradation of each layer, collecting an aggregate distribution digital image of each layer, and converting to a CAD (computer aided design) image format after treatment; further introducing discrete element software, and respectively generating irregular aggregate and asphalt mortar according to positions of aggregate block bodies and the asphalt mortar in each structural layer; setting boundary conditions and aggregate and asphalt mortar thermophysical parameters, as well as intra-unit thermal contact resistance and interlayer contact parameters according to a hot in-place recycling heating way and distribution characteristics of a temperature field, and establishing a discrete element model of the pavement structure; and applying a constant heat flow with a certain temperature to the surface of the model, recording the changes in temperature at different times of each layer of the pavement structure, and combining with the temperature field and a distribution cloud picture of the heat flow to analyze the temperature field of the pavement structure and evaluate the hot in-place recycling heating effect.
The invention relates to a method for accurately evaluating a hot in-place recycling heating effect of an asphalt pavement based on a discrete element method, belongs to the technical field of hot recycling of the asphalt pavement and aims at solving the problem that the evaluation of the hot in-place recycling heating effect of the asphalt pavement is not accurate. The method comprises the following steps: firstly taking a core out of the pavement, defining the structural combination of the pavement and the type of gradation of each layer, collecting an aggregate distribution digital image of each layer, and converting to a CAD (computer aided design) image format after treatment; further introducing discrete element software, and respectively generating irregular aggregate and asphalt mortar according to positions of aggregate block bodies and the asphalt mortar in each structural layer; setting boundary conditions and aggregate and asphalt mortar thermophysical parameters, as well as intra-unit thermal contact resistance and interlayer contact parameters according to a hot in-place recycling heating way and distribution characteristics of a temperature field, and establishing a discrete element model of the pavement structure; and applying a constant heat flow with a certain temperature to the surface of the model, recording the changes in temperature at different times of each layer of the pavement structure, and combining with the temperature field and a distribution cloud picture of the heat flow to analyze the temperature field of the pavement structure and evaluate the hot in-place recycling heating effect.
Method for evaluating hot in-place recycling heating effect of asphalt pavement
22.07.2015
Patent
Elektronische Ressource
Englisch
IPC:
E01C
Bau von Straßen, Sportplätzen oder dgl., Decken dafür
,
CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE
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