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Irregular aggregate specific surface area testing method based on random section

A technology of specific surface area and test method, applied in permeability/surface area analysis, measurement device, analysis material, etc., can solve the problems of cumbersome data processing, complicated operation, expensive equipment, etc., to improve test accuracy, simple operation, cost low effect

Inactive Publication Date: 2021-01-12
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is more accurate in testing, but the method is expensive in equipment, complicated in operation, cumbersome in data processing, and time-consuming

Method used

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  • Irregular aggregate specific surface area testing method based on random section
  • Irregular aggregate specific surface area testing method based on random section
  • Irregular aggregate specific surface area testing method based on random section

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Embodiment

[0040] The invention relates to a method for testing the specific surface area of ​​random aggregates based on random cross-sections. The proportional relationship in the statistical sense, the former is 4 / π times of the latter.

[0041] The method of the present invention will be described in detail below in conjunction with the test process of the specific surface area of ​​machine-made sand with a particle size of 0.5-1.0mm, which will help those skilled in the art to further understand the present invention, but does not limit the present invention in any form.

[0042] Such as figure 1 Shown, the specific steps of the random aggregate specific surface area test method of the present invention based on random cross-section include:

[0043] (1) sample preparation

[0044] Use epoxy resin to cure the aggregate particles in the mold, remove the mold after hardening, cut the sample randomly and polish it with sandpaper to make the surface smooth. To increase the contrast b...

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Abstract

The invention relates to an irregular aggregate specific surface area testing method based on a random cross section, which comprises the following steps: 1) solidifying aggregate particles in a mold,removing the mold after hardening, randomly cutting a sample, and polishing with abrasive paper until the surface is flat; 2) acquiring a color image of the cut section of the sample processed in thestep 1); 3) converting the color image into a grayscale image, carrying out binarization processing, processing white into a background, and processing black into an aggregate cross section; 4) reading the number of pixel points representing aggregate and the number of pixel points representing aggregate boundaries in the binarized image, and determining the side length of the pixel points; and 5) calculating the specific surface area of the aggregate according to the number of the pixel points representing the aggregate, the number of the pixel points representing the boundaries of all the aggregates and the side lengths of the pixel points. Compared with the prior art, the method has the advantages of rapid and accurate test, cost saving, time saving, labor saving and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for testing the specific surface area of ​​random aggregates based on random sections. Background technique [0002] Due to the limitation of resources and environment, natural aggregates are gradually scarce, and machine-made aggregates such as machine-made sand gradually replace natural aggregates for the preparation of concrete. Among the various properties of aggregates, the specific surface area can comprehensively evaluate the characteristics of aggregates such as size, shape, angularity, and surface roughness. From the perspective of mix ratio design, the specific surface area of ​​aggregate affects the amount of slurry or water required for the mixture, and indirectly affects the workability, mechanical properties and durability of concrete. Therefore, the specific surface area of ​​aggregate is crucial to the design and performance of concrete. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/088G01N2015/0846
Inventor 蒋正武任强
Owner TONGJI UNIV
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