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Device for testing different cracking conditions of interior of cement-based material and method

A cement-based material and test piece technology, applied in the direction of material resistance, can solve the problem of difficult detection of deep internal defects in concrete

Active Publication Date: 2011-08-10
BEIJING UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of infrared penetration ability, it is difficult to detect the internal defects in the deep layer of concrete

Method used

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  • Device for testing different cracking conditions of interior of cement-based material and method
  • Device for testing different cracking conditions of interior of cement-based material and method
  • Device for testing different cracking conditions of interior of cement-based material and method

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Embodiment Construction

[0022] In order to verify that the AC impedance spectroscopy method can be used to test different internal cracking conditions of cement-based materials, the cement paste and fly ash cement paste specimens are selected in the test, and the water-cement ratio is 0.3 and 0.35, respectively, in the flexural strength range of the specimens Apply a four-level load inside, and carry out the test according to the following steps in conjunction with the drawings.

[0023] 1. Make the same 2 groups and each group has 4 standard cement-based material specimens 1 with a size of 40×40×160mm. The specimen number and mix ratio design are shown in Table 1. Cure in a water bath for 3 days according to the standard method, then take it out and wipe the surface of the test piece with a dry clean cloth. The first group of test pieces was wrapped and sealed with plastic film, and the second group of test pieces was tested for flexural strength in parallel.

[0024] 2. Fix each test piece 1 in the sec...

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Abstract

The invention relates to a device for testing different cracking conditions of the interior of a cement-based material and a method, belonging to the testing field of a building material. The testing method comprises the following steps: the periphery of a cement-based material test specimen (1) with the standard size of 40*40*160mm is wrapped and sealed by a plastic film and fixed in an anti-fracture testing machine (2); two stainless steel electrodes (3) are respectively fixed on two opposite 40*40mm parallel surfaces of the test specimen (1); and the two stainless steel electrodes (3) and a constant potential rectifier are respectively connected by a working electrode (5) and a reference electrode (6). During testing, the anti-fracture testing machine (2) applies different grades of bending loads to the test specimen (1) so as to lead the test specimen (1) to reach different cracking conditions and complete a test procedure of the alternating current impedance spectroscopy of the constant potential rectifier (4); and impedance parameters collected by a computer (7) are used for reflecting different cracking conditions of the interior of the cement-based material. The testing method can rapidly and accurately reflect different cracking conditions of the interior of the cement-based material and is simple and practical.

Description

Technical field [0001] The invention belongs to the technical field of building material detection. It is a device and method for testing different internal cracking conditions of cement-based materials. Background technique [0002] Cracks are one of the common defects of cement concrete, which are very harmful to buildings, especially internal cracks, which are more hidden and more harmful. However, the commonly used non-destructive testing methods can only detect cracks in a relatively shallow range (20cm-30cm), and the range is limited. So far, there is no method that can achieve real-time monitoring and study the dynamic changes of internal crack defects in concrete. [0003] Currently commonly used detection methods are: ultrasonic detection, radar detection, optical fiber sensing detection, shock echo method and infrared imaging method. Different methods have different problems. [0004] 1) Ultrasonic method. It is to synthesize the relative changes of parameters such as t...

Claims

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Application Information

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IPC IPC(8): G01N27/20
Inventor 李悦随春娥李学辉
Owner BEIJING UNIV OF TECH
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