Method for evaluating hot in-place recycling heating effect of asphalt pavement

Abstract

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.

Description

technical field

[0001] The invention is a method for accurately evaluating the heating effect of hot-in-place regeneration of asphalt pavement based on a discrete element method, in particular a method for solving inaccurate evaluation of the internal heating effect of the hot-in-place regeneration asphalt pavement structure, and belongs to the technical field of thermal regeneration of asphalt pavement. Background technique

[0002] With the development of my country's social economy, highway construction is also booming. By the end of 2014, the total mileage of expressways has reached 112,000 kilometers. By the end of the "12th Five-Year Plan", the national expressway network will be basically completed. However, at the same time, the traffic volume is also increasing, which brings early damages such as rutting, cracks, and looseness to the asphalt pavement. If these damaged pavements cannot be maintained in time, the performance of the pavement will be affected. With the ...

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