Characterization method of pore structure of porous concrete based on CT (Computerized Tomography) technology

A technology of porous concrete and CT technology, applied in the field of measurement, can solve problems such as difficulty in ensuring accuracy, limited data acquisition points, and damage to the pore structure of concrete, and achieve the effects of simple test method, short detection time, and accurate characterization.

Inactive Publication Date: 2014-02-12
UNIV OF JINAN
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  • Application Information

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Problems solved by technology

The rubbing method is difficult to implement, and the accuracy is difficult to guarantee; and the image based on camera imaging technology needs to cut the formed porous concrete along the radial direction, which not only destroys the internal pore structure of the concrete, but also has limited data points
Therefore, neither of these two methods can objectively and accurately reflect the internal pore structure of porous concrete.

Method used

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  • Characterization method of pore structure of porous concrete based on CT (Computerized Tomography) technology
  • Characterization method of pore structure of porous concrete based on CT (Computerized Tomography) technology
  • Characterization method of pore structure of porous concrete based on CT (Computerized Tomography) technology

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The basalt coarse aggregate with a particle size of 9.5~16.0mm was screened out through square holes, and the porous concrete was prepared according to the water-cement ratio of 023 and the cement-to-bone ratio of 1 / 6.5, and was molded with a φ110mm×150mm PVC pipe, and demolded after curing for 7 days. Test piece samples such as figure 1 shown. Two-dimensional tomographic images of porous concrete (such as figure 2 As shown, the two-dimensional tomographic images obtained by CT scanning are rich. Due to the limited space of the patent, 6 images are selected here to introduce the processing process in detail, and the rest of the image processing methods are similar), and the scanning thickness is 5mm. Using ImageJ TM The image processing software performs black and white binary processing on the CT image (such as image 3 ), calculate the area of ​​the area represented by the pores to obtain the plane porosity (such as Figure 4 ), and then filter out micropores wit...

Embodiment 2

[0027] Limestone coarse aggregates with a particle size of 19.0-26.5 mm were screened out using square holes, and porous concrete was prepared according to the absolute volume method, with a target porosity of 26%. The PVC pipe of φ110mm×150mm was used to form it, and after curing for 7 days, it was removed from the mold to obtain the test piece sample. A 320-row advanced PET / CT machine from Germany's Siemens was used to scan to obtain a two-dimensional tomographic image of porous concrete. Using ImageJ TM After the image processing software performs black and white binary processing on the CT image, calculate the area of ​​the area represented by the pores to obtain the plane porosity, then filter out micropores with a diameter less than 1mm, and then import the data into the statistical analysis software to obtain the effective pore size and pore size distribution (Such as Figure 7 ) and the longitudinal distribution of planar porosity (such as Figure 8 ).

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Abstract

The invention discloses a characterization method of a pore structure of porous concrete based on a CT (Computerized Tomography) technology. Pore structure parameters such as the plane porosity, the effective aperture and the aperture distribution of the porous concrete are obtained by analyzing a CT-scanned two-dimensional cross-sectional image through an image processing method. The characterization method specifically comprises the following steps: firstly, acquiring the two-dimensional cross-sectional image of the porous concrete by a CT scanner, and acquiring a clear pore distribution map by white and black binarization of the image by a computer; then, calculating the area representing a pore region by image processing software and converting the region into a circle with equal area; and finally, carrying out statistic analysis on data with pore grater than 1mm to obtain the pore structure parameters such as the plane porosity, the effective aperture and the aperture distribution of the porous concrete. By adopting the characterization method of the pore structure of the porous concrete, not only is the test method simple, but also the precision is high and the error is small.

Description

technical field [0001] The invention belongs to the technical field of measurement, in particular to a method for characterizing the pore structure of porous concrete. Background technique [0002] Porous concrete is mainly concentrated in: permeable concrete roads, green concrete, sound-absorbing concrete, marine and bio-adaptive concrete, etc., and has broad development and application prospects. However, the internal pore structure and distribution regularity of porous concrete are poor, so it is difficult to fully reflect the internal pore structure of concrete only by porosity. The pore structure of porous concrete determines its performance, so it is necessary to develop a method that can quickly and accurately characterize the pore structure of porous concrete. [0003] At present, there are mainly two methods for testing the pore structure of porous concrete at home and abroad: one is the rubbing method as described in the patent CN 10100430A; the other is the image...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04G01N15/08
Inventor 宫晨琛芦令超王守德颜小波黄庆亮程新
Owner UNIV OF JINAN
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