A detection method for the development of internal cracks in cement-based materials under load

A technology of cement-based materials and internal cracks, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve problems such as poor accuracy, inability to obtain intuitive data, and low reliability, and achieve the effect of overcoming poor accuracy

Active Publication Date: 2017-11-17
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, using mainstream testing methods, such as ultrasonic method and shock elastic wave method, to test the development of cracks, only a rough value can be obtained, the accuracy is poor and intuitive data cannot be obtained, and the reliability is not high

Method used

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  • A detection method for the development of internal cracks in cement-based materials under load
  • A detection method for the development of internal cracks in cement-based materials under load
  • A detection method for the development of internal cracks in cement-based materials under load

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Embodiment 1

[0055] 1) Sample: Ordinary Portland cement with PO42.5 specifications (manufacturer: Yingde Nanshan Cement Factory) and standard sand produced in accordance with the national standard GB / T17671-1999 (manufacturer: Xiamen Aisiou Standard Sand Co., Ltd. ) and ordinary water, according to the ratio C:S:H=1:1:0.4, import it into a mold (self-made) with a standard diameter of 10mm and a height of 10mm, smooth the surface of the sample to form a flat surface, and vibrate , dense, forming; 24 hours to remove the formwork, and then placed in a standard curing room (relative humidity is 99%, room temperature is 21 ℃) curing for 28 days, after taking out and drying, it can be used as a cement mortar sample for testing.

[0056] 2) Test: Load the sample with Deben X-ray tomography microscopic material testing tension and compression instrument (manufacturer: DEBEN, model: Mechanical Operation V1.0,), the equipment is equipped with an internal lifting and lowering pressure device and X Ra...

Embodiment 2

[0067] 1) Sample: Use PO42.5 ordinary Portland cement (manufacturer: Yingde Nanshan Cement Factory) and ordinary water, according to the ratio: cement: water = C: W = 1: 0.4, the standard diameter is 10mm, In a cylinder mold with a height of 10mm, the surface of the sample is smoothed to form a flat surface, and vibrated, compacted, and formed; the mold is removed after 24 hours, and then placed in a standard curing room (relative humidity is more than 95%, The room temperature is 21°C) and cured for 28 days. After taking out and drying, it can be used as a cement paste sample for testing.

[0068] 2) Test: Load the sample with the Deben X-ray tomography microscopic material testing tension and compression instrument, set the loading force as 0N and 900N, respectively pressurize in order, and then use the three-dimensional reconstruction imaging X-ray microscope to test Scan the sample and record the results.

[0069] 3) Reconstruction analysis: Use XCT-400's built-in reconst...

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Abstract

The invention discloses a detection method for the development of internal cracks of cement-based materials under load. The X-ray tomographic microscopic material testing tension and pressure instrument is used to load the cement-based material samples, and the three-dimensional reconstruction imaging X-ray microscope is used to detect the cracks. The sample is scanned to obtain images of crack development in the longitudinal section and / or cross section of the sample under pressure. The invention overcomes the common problems of poor precision, low reliability and poor intuition of conventional testing methods, and realizes the direct, reliable and intuitive feedback results of the impact on the internal cracks of cement-based materials under real-time loads. The detection and research of internal cracks under load provide an effective method and basis.

Description

[technical field] [0001] The invention relates to the detection of internal cracks of materials, in particular to a detection method for the development of internal cracks of cement-based materials under load. [Background technique] [0002] Concrete is the most widely used building and structural material today. Due to the composition of the structure itself and the characteristics of its bearing capacity, there are often some original micro-cracks inside the concrete. During its service, as the load changes and time goes by, the internal micro-cracks will develop into cracks, or even develop to The surface causes the concrete material to crack. After the formation of through cracks, the concrete is more susceptible to erosion and damage from the external environment and various harmful factors, such as steel corrosion, carbonation, chloride ion corrosion and sulfate corrosion, etc., which eventually lead to cracking and damage of the concrete structure, which no longer me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
Inventor 董必钦邢锋房国豪孙红芳史尧刘莉华
Owner SHENZHEN UNIV
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