Method for randomly building bituminous mixture multilayered structure simulation model

Abstract

The invention discloses a method for randomly building a bituminous mixture multilayered structure simulation model. The method comprises the following steps of: generating units with different sizes and different size distribution features in different preset spaces by defining; mutually combining the units in each preset space and processing; and finally, building the bituminous mixture multilayered structure simulation model. According to the method for randomly building the bituminous mixture multilayered structure simulation model, the buildup of the bituminous mixture microstructure simulation model can get rid of constraints of conditions of testing equipment, the image processing technology and the like, and meanwhile, and gap capture can also be realized, so that the testing complexity is lowered, and the testing cost is also reduced.

Description

technical field [0001] The invention relates to a method for constructing a simulation model, in particular to a method for randomly constructing a multi-level structure simulation model of asphalt mixture. Background technique [0002] Asphalt mixture is a heterogeneous multi-layer composite phase material composed of mineral aggregates, voids and asphalt mortar, which is widely used in road and bridge pavement projects. The performance and failure mechanism of composite materials are not only related to its macroscopic gradation characteristics and the mechanical properties of each component phase, but also related to the flatness, fracture surface, long-axis orientation of the aggregate phase, the size and distribution of voids, and the interface between the phases. The mesoscopic characteristics such as characteristics are closely related. [0003] In order to reveal the influence of the internal mesostructure of asphalt mixture on its macroscopic performance, it is nec...

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Problems solved by technology

[0004] It is true that the numerical model constructed based on digital image information can achieve a good mapping relationship with real asphalt mixture specimens, but there are still several problems in application: (1) Dependence on laboratory conditions, to achieve an image-based The numerical model of information requires forming asphalt mixture specimens, expensive test equipment and image processing technology, and the current application of CT equipment in the field of domestic road research is still in the preliminary stage; (2) The matching of equipment performance and image processing accuracy, Because the density difference between fine aggregate and asphalt cement (dispersed in asphalt binder with mineral filler as the dispersed phase) is small, the X-ray scanning technology that relies on a large density difference to accurately distinguish objects can only be used Coarse aggregate and asphalt mortar with a particle size greater than 2.36 mm can be better identified (fine aggregate is dispersed in asphalt mortar), and it is also difficult to capture voids; (3) Researchers are more concerned about , when the research requires a large number of different ore gradations, aggregates with different properties and shapes, asphalt binders with different properties and contents, and void ratios, the numerical model obtained through digital image processing will be extremely complicated. Forming, image imaging, data post-processing, etc. are time-consuming and expensive

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