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Method for calculating characterization parameters of three-dimensional microstructure of asphalt mixture

A technology of asphalt mixture and mesostructure, which is applied in calculation, image data processing, electrical digital data processing, etc., can solve the problems of insufficient mesostructure characterization, lack of mesostructure design indicators, etc., and achieve the accuracy of evaluation High, complete evaluation system effect

Active Publication Date: 2019-12-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this invention is to solve the existing problem of insufficient characterization of the microstructure of the particles in the asphalt mixture and the lack of mesostructure design indicators in the design of the mixture , and a calculation method for three-dimensional mesostructure parameters of asphalt mixture is proposed

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  • Method for calculating characterization parameters of three-dimensional microstructure of asphalt mixture
  • Method for calculating characterization parameters of three-dimensional microstructure of asphalt mixture
  • Method for calculating characterization parameters of three-dimensional microstructure of asphalt mixture

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specific Embodiment approach 1

[0022] Specific implementation mode 1: In this implementation mode, a method for calculating the three-dimensional mesoscopic structure characterization parameters of asphalt mixture The specific process is as follows:

[0023] Mesostructure characterization parameters include the average shortest distance between the centroids of aggregates with a particle size greater than 4.75 mm and less than or equal to 9.5 mm D 4.75-9.5 (mm), the average value of the shortest distance between the centroids of aggregates with a particle size greater than 9.5mm and less than or equal to 13.2mm D 9.5-13.2 (mm), the average value of the shortest distance between the centroids of aggregates with a particle size greater than 13.2mm and less than or equal to 16mm D 13.2-16 (mm), the weighted average value V of aggregate volume ratios of different grades of aggregates with a particle size greater than 4.75mm and less than or equal to 9.5mm 4.75-9.5 , the weighted average V of aggregate volume r...

specific Embodiment approach 2

[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in the step one, based on the centroid coordinates of each aggregate (intercepting 1000 two-dimensional images, inputting three-dimensional reconstruction software, obtaining the center and Radius), calculate the spatial distance between each aggregate and the center of mass of other aggregates of the same file, and sort the calculated spatial distances to obtain the shortest distance between each aggregate and the center of mass of aggregates of the same file, and calculate the average value to obtain the same The mean value of the shortest distance between the centroids of the file aggregates (D); the specific process is:

[0031] Because it can only be accurately extracted (this invention is about asphalt mixture, it is a material mixed with asphalt and aggregates of different grades. It can only extract particles with a particle size of 4.75mm and above because CT The...

specific Embodiment approach 3

[0035] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the shortest distance between the centroids (D 13.2-16 ) The specific solution process is: (The following is to find D 13.2-16 as an example. )

[0036] figure 2 It is the projection diagram of the three-dimensional model of asphalt mixture, in which black represents aggregates with a particle size greater than 13.2 mm and less than or equal to 16 mm, dark gray represents aggregates with a particle size greater than 9.5 mm and less than or equal to 13.2 mm, and medium gray represents aggregates with a particle size greater than 4.75 mm and less than Equal to 9.5mm of aggregate.

[0037] (1) Randomly select one of the aggregates with a particle size greater than 13.2mm and less than or equal to 16mm (select No. 1 aggregate here) as No. 1 aggregate, and calculate the distance between the centroid of No. 1 aggregate and the centroid of other aggregates of the sa...

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Abstract

The invention discloses a method for calculating characterization parameters of a three-dimensional microstructure of an asphalt mixture, and relates to a method for calculating characterization parameters of a three-dimensional microstructure of an asphalt mixture. The objective of the invention is to solve the problems of insufficient representation of the microstructure of particles in an asphalt mixture and lack of microstructure design indexes in the design of the mixture in the prior art. The method comprises the following steps: 1, calculating the mean value of the shortest distances between same-grade aggregate centroids, and obtaining characterization parameters of the three-dimensional microstructure of the asphalt mixture: the mean value of the shortest distances between the mass centers of aggregates when the particle size is larger than 4.75 mm and smaller than or equal to 9.5 mm, the particle size is larger than 9.5 mm and smaller than or equal to 13.2 mm, and the particle size larger than 13.2 mm and smaller than or equal to 16 mm; and 2, based on the shortest distance between the centroids of the aggregates at the same grade obtained in the step 1, calculating theweighted mean value of the volume ratios of the aggregates at different grades to obtain the characterization parameters of the three-dimensional microstructure of the asphalt mixture. The method is applied to the field of the three-dimensional microstructure of the asphalt mixture.

Description

technical field [0001] The invention relates to a calculation method for three-dimensional mesoscopic structure characterization parameters of asphalt mixture. Background technique [0002] Asphalt mixture is a multiphase composite material, its main components are aggregate, asphalt and mineral powder, and aggregate can be divided into coarse aggregate and fine aggregate according to particle size, different components in asphalt mixture have different functions. The skeleton formed by intercalation of coarse aggregates is the main force-bearing system of asphalt mixture, and the asphalt mortar composed of fine aggregate, mineral powder and asphalt is used as the main filling system of asphalt mixture to fill the gaps inside the skeleton of coarse aggregate. Dense asphalt mixture. The two systems together form an asphalt mixture with complete performance to meet the actual road conditions. At the same time, there is a significant restrictive relationship between the two s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/00
CPCG06T17/00
Inventor 谭忆秋张凯邢超梁尊东邹晶晶
Owner HARBIN INST OF TECH
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