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Cement-based material porosity distribution testing method and device based on industrial X-ray tomography

A technology for cement-based materials and distribution testing, which is applied in measuring devices, suspension and porous material analysis, permeability/surface area analysis, etc. Find out the specific distribution of porosity with space, etc., to reduce the occupied time and solve the difficult effect of porosity distribution measurement

Inactive Publication Date: 2011-11-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Quantitative statistical methods include mercury injection method, gas adsorption method, boiling water absorption method, heat preservation oil absorption method, etc. These methods can only give the statistical average value of the internal porosity of a certain sample, and cannot obtain the distribution of porosity with space
Microscopic observation methods such as metallographic microscope, electron microscope, and industrial X-ray tomography can visually see where the pores are, and can also approximate the porosity within a certain range based on stereology and statistics, but it is difficult to give Specific distribution of porosity with space
In addition, metallographic microscopes and electron microscopes can only see one section, and there is a gap between the porosity data deduced from a section section and the actual three-dimensional porosity data; various X-ray tomography is limited by the spatial resolution of observation, often Only relatively large pores can be observed and characterized, ignoring the gel pores and small capillary pores that account for a large proportion of cement-based materials

Method used

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  • Cement-based material porosity distribution testing method and device based on industrial X-ray tomography
  • Cement-based material porosity distribution testing method and device based on industrial X-ray tomography
  • Cement-based material porosity distribution testing method and device based on industrial X-ray tomography

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Embodiment 1

[0038] Step 1: Select samples. In order to verify the reliability of this method, a certain degree of dissolution of calcium-dissolved cement paste samples is selected, so as to ensure that there is a porosity gradient inside the samples.

[0039] Step 2: Vacuum dry the sample to be tested in a vacuum oven for 48 hours and weigh it to a constant weight to ensure that the sample reaches a completely anhydrous state;

[0040] Step 3: Take a plastic test tube 4, inject epoxy resin liquid and curing agent into its bottom, after it is cured, use 502 glue to fix the completely dried cement-based material 2 on the cured resin 1, the plastic test tube uses the first The perforated rubber stopper 6 is sealed; the plastic test tube 4 is fixed on the rotary sample stage of industrial X-ray tomography and the first X-ray tomography is carried out to obtain the tomographic grayscale data of the completely dry sample; the fourth step: take one for use Erlenmeyer flask 12 sealed by rubber st...

Embodiment 2

[0052] A cement-based material porosity distribution testing device based on industrial X-ray tomography, comprising: a plastic hose 5, a plastic test tube 4 with epoxy resin fixed at the bottom and a vacuum suction device,

[0053] The two ends of the plastic hose 5 are respectively connected with a second rubber plug 7 and a third rubber plug 8,

[0054] A first perforated rubber stopper 6 is provided on the test tube hole of the plastic test tube 4,

[0055] Described vacuum suction device comprises Erlenmeyer flask 12, is provided with rubber stopper 11 on the bottleneck of Erlenmeyer flask 12, is connected with vacuum gauge 14 on Erlenmeyer flask 12, passes first vacuum tube on Erlenmeyer flask 12 simultaneously 13 is connected with vacuum pump 15, is also connected with second vacuum tube 10 on conical flask 12 and conical flask 12 is connected with one end of second vacuum tube 10, is connected with the 4th opening rubber stopper 9 at the other end of second vacuum tube...

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Abstract

The invention provides a cement-based material porosity distribution testing method and device based on industrial X-ray tomography. The method provided by the invention comprises the following steps: fixing a dry sample in a plastic test tube for tomography so as to obtain the fault grey data of the dry sample; injecting water or aqueous solution and vacuumizing so that the sample reaches saturation on the premise that the original position of the sample is kept; carrying out original position tomography in the same condition to obtain the fault grey data of the saturated sample; and computing the grey data obtained from two times of tomography to obtain a 3D porosity distribution. The device provided by the invention comprises the plastic test tube sealed by a first rubber plug, a plastic soft tube and a vacuum pumping device; a second rubber plug and a third rubber plug are connected with the two ends of the plastic soft tube respectively; the third rubber plug is connected with the vacuum pumping device; the second rubber plug and the first rubber plug are in negative-pressure connection when the vacuum pump is in operation; and the second rubber plug and the first rubber plugare separated when the vacuum pump stops operation.

Description

technical field [0001] The invention relates to a method and device for testing the porosity distribution of cement-based materials based on industrial X-ray tomography, in particular to a method and a device for detecting the three-dimensional porosity distribution of concrete, mortar and other cement-based material test blocks. Background technique [0002] The porosity of cement-based materials is an important technical parameter that determines the mechanical properties, transmission properties and durability of the material. How to accurately characterize the porosity of cement-based materials has attracted extensive attention of researchers. Porosity testing methods are divided into two categories: quantitative statistical methods and microscopic observation methods. Quantitative statistical methods include mercury injection method, gas adsorption method, boiling water absorption method, heat preservation oil absorption method, etc. These methods can only give the sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 万克树王国伟
Owner SOUTHEAST UNIV