Visual continuous tracking test method of freezing and thawing damage processes of cement materials

Abstract

The invention provides a visual continuous tracking test method of freezing and thawing damage processes of cement materials, and belongs to the field of freezing and thawing damage detection of cement materials. The method comprises the following steps: performing layer surface scanning on a cement-based material sample by utilizing an X-ray computed tomography imaging device to obtain a scannedimage; performing optimization processing on the scanned image to obtain an optimized image; performing three-dimensional reconstruction on the optimized image through computer processing to obtain areconstructed cement-based material sample image; comparing the cement-based material sample image which is subjected to freezing and thawing cycles with the cement-based material sample image which is not subjected to freezing and thawing cycles, and comparing the images of the cement-based material samples under different freezing and thawing cycles to obtain the rule of change of unhydrated cement particles after different freezing and thawing cycles of the cement-based material samples; and calculating internal and external damage degrees of the cement material under the corresponding freezing and thawing cycles according to the rule of change. The method provided by the invention overcomes the defects that a common test means needs to damage the sample and can not track for a long time and the like.

Description

Technical field [0001] The invention relates to the technical field of freeze-thaw damage detection of cement materials, in particular to a visual continuous tracking test method for the freeze-thaw damage process of cement materials. Background technique [0002] Cement is one of the most widely used building materials today. This material has good compressive performance, high plasticity, economical and practical characteristics. However, during long-term use, cement-based materials are affected by the environment, especially in cold areas, which are prone to freeze-thaw damage, causing the surface of cement-based materials to peel off, internal cracking, and ultimately resulting in reduced compressive performance of cement-based materials and internal movement. The modulus of elasticity drops and finally loses the bearing capacity, which brings serious consequences. Therefore, the deterioration, detection, and repair of cement-based materials under freeze-thaw cycles are one ...

AI Technical Summary

Problems solved by technology

These methods cannot directly and reliably evaluate the internal conditions of cement-based materials after freeze-thaw cycle damage. At the same time, evaluation methods such as compressive strength need to destroy the sample every time a sample is tested, which cannot be achieved for a long time. In situ tracking analysis Freeze-thaw damage analysis

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