A microstructure detection method for freeze-thaw damage of cement-based materials

A cement-based material and microstructure technology, which is used in material analysis using radiation, preparation of test samples, etc., can solve problems such as the inability to monitor the evolution of material microstructure and the difficulty of quantifying monitoring data.

Inactive Publication Date: 2015-12-23
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0003] The existing detection methods for freeze-thaw damage of cement-based materials mainly include fast freezing method, slow freezing method and salt freezing method. These methods can obtain the relationship between the relative dynamic elastic modulus of cement-based composite materials and the number of freeze-thaw cycles. , but cannot monitor the evolution of the internal microstructure of the material
Acoustic emission technology can monitor the internal damage and elastic modulus changes of cement-based composites during freeze-thaw cycles, but the monitoring data is difficult to quantify

Method used

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  • A microstructure detection method for freeze-thaw damage of cement-based materials
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  • A microstructure detection method for freeze-thaw damage of cement-based materials

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Embodiment

[0053] The present embodiment illustrates the method of the present invention with cement slurry. Specific steps are as follows:

[0054] a) Use PI52.5 cement to form a cement slurry sample in a PU pipe with Φ=8.2mm and L=50mm, and put it in a saturated calcium hydroxide solution for curing for 8 months at a curing temperature of T=20±2°C;

[0055] b) Cut and polish the sample into a cylindrical sample with Φ=8.2mm and L=10mm;

[0056] c) adopt vacuum saturated water method, carry out vacuum saturated calcium hydroxide solution treatment to sample;

[0057] d) performing X-ray tomography on the sample to obtain a set of initial two-dimensional images IO of the sample before freezing and thawing;

[0058] e) Using the vacuum saturated water method, the sample is again treated with a vacuum saturated calcium hydroxide solution.

[0059] f) Freezing-thawing pretreatment of samples: immerse a part of the samples in aviation kerosene, coded as sample 1; fully seal a part of the ...

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Abstract

The invention discloses a microstructure detection method for freezing-thawing damage of cement-based materials. According to the microstructure detection method for the freezing-thawing damage of the cement-based materials, the freezing and thawing cycle experiment method conforming to the national standard is not adopted, microstructures of the cement-based materials before and after the freezing-thawing damage can be obtained by changing the surface sealing states of the cement-based material test samples and freezing and thawing cycle systems, and utilizing a microstructure detection measure, namely an X-ray tomography imaging technology, wherein the surface sealing states include full epoxy resin sealing, half epoxy resin sealing, full preservative film package no preservative film package and no sealing, and the freezing and thawing cycle systems include gas freezing and thawing, oil freezing and thawing, and single-surface water freezing and thawing, and microfracture information caused by the freezing and thawing cycle can be quantitatively analyzed, so that the basis is provided for the mechanism research of freezing-thawing damage of the cement-based composite materials.

Description

technical field [0001] The invention belongs to the field of performance detection of cement-based composite materials, in particular to a microstructure detection method for freeze-thaw damage of cement-based materials. Background technique [0002] Freeze-thaw damage is the main reason for the deterioration of concrete structures in cold and humid areas, and it is also the main disease encountered in the operation of hydraulic concrete buildings in my country. The root cause of the failure of concrete structures caused by freeze-thaw damage is the deterioration of the microstructure of cement-based materials. [0003] The existing detection methods for freeze-thaw damage of cement-based materials mainly include fast freezing method, slow freezing method and salt freezing method. These methods can obtain the relationship between the relative dynamic elastic modulus of cement-based composite materials and the number of freeze-thaw cycles. , but cannot monitor the evolution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/04G01N1/28
Inventor 刘琳蒋建华沈德建赵海涛
Owner HOHAI UNIV
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