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Method for detecting internal crack developing of cement-based material under action of load

A technology of cement-based materials and detection methods, which is applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of poor accuracy, low reliability, and inability to obtain intuitive data, and achieves the goal of overcoming poor accuracy. Effect

Active Publication Date: 2015-02-18
SHENZHEN UNIV
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  • Summary
  • 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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  • Method for detecting internal crack developing of cement-based material under action of load
  • Method for detecting internal crack developing of cement-based material under action of load
  • Method for detecting internal crack developing of cement-based material under action of load

Examples

Experimental program
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Effect test

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 method for detecting the internal crack developing of a cement-based material under the action of load. The method comprises the steps of loading a sample of the cement-based material by an X-ray computed tomography scanning microscopic material test pull pressure instrument, and scanning the sample by a three-dimensional reconstruction imaging X-ray microscope to obtain the image of crack developing of the longitudinal section and / or the transverse section of the sample under the action of pressure. After the method is adopted, the common problems of poor accuracy, low reliability, poor intuition and the like of the conventional testing measures can be solved, the direct, reliable and visual feedback result of the influence on the internal crack of the cement-based material under the action of load can be realized, and an effective method and basis are provided for the detection and study of the internal crack developing of the cement-based material under the action of load.

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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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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