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Ultrasonic method based concrete carbonation depth test method

A technology of carbonization depth and testing methods, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, analysis by making materials undergo chemical reactions, and material analysis by observing the impact on chemical indicators, etc. It can solve the problems of complex test methods, Expensive and other issues, to achieve the effect of simple test methods, integrity assurance, and small errors

Inactive Publication Date: 2017-12-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Purpose of the invention: Aiming at the problem that the existing non-damaged concrete carbonation depth test method is complex and expensive, the present invention provides a concrete carbonation depth test method based on the ultrasonic method, which can conveniently and quickly test the propagation of ultrasonic waves in carbonized concrete The speed, according to the corresponding conversion formula, is converted into the carbonation depth of concrete to evaluate the carbonation degree of concrete

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  • Ultrasonic method based concrete carbonation depth test method
  • Ultrasonic method based concrete carbonation depth test method
  • Ultrasonic method based concrete carbonation depth test method

Examples

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Embodiment 1

[0037] A method for testing the carbonation depth of concrete based on ultrasonic method, comprising the following steps:

[0038] Step 1, test piece forming and carbonization: form a C20 concrete test piece according to the established mix ratio, remove the formwork, and then perform carbonization for 28 days after curing;

[0039] Step 2, ultrasonic test: After marking the ultrasonic measuring point and measuring the ultrasonic distance, test the time for the ultrasonic wave to pass through the test piece, and calculate the sound velocity value of the test piece;

[0040] Step 3, phenolphthalein indicator test: break the test piece, spray phenolphthalein indicator on the split section, take the average of 10 points as the carbonization depth of the test piece;

[0041] Step 4, by fitting and analyzing the ultrasonic sound velocity value obtained in step (2) and the carbonization depth value obtained in step (3), the relationship between the two is established, such as figur...

Embodiment 2

[0047] A method for testing the carbonation depth of concrete based on ultrasonic method, comprising the following steps:

[0048] Step 1, specimen forming and carbonization: form a C30 concrete specimen according to a predetermined mix ratio, remove the formwork, and then perform carbonization for 28 days after curing;

[0049] Step 2, ultrasonic test: After marking the ultrasonic measuring point and measuring the ultrasonic distance, test the time for the ultrasonic wave to pass through the test piece, and calculate the sound velocity value of the test piece;

[0050] Step 3, phenolphthalein indicator test: break the test piece, spray phenolphthalein indicator on the split section, take the average of 10 points as the carbonization depth of the test piece;

[0051] Step 4, by fitting and analyzing the ultrasonic sound velocity value obtained in step (2) and the carbonization depth value obtained in step (3), the relationship between the two is established, such as figure 2...

Embodiment 3

[0057] A method for testing the carbonation depth of concrete based on ultrasonic method, comprising the following steps:

[0058] Step 1, test piece forming and carbonization: Form C30 concrete test pieces mixed with mineral admixtures according to the established mix ratio, and carbonize for 28 days after demoulding and curing;

[0059] Step 2, ultrasonic test: After marking the ultrasonic measuring point and measuring the ultrasonic distance, test the time for the ultrasonic wave to pass through the test piece, and calculate the sound velocity value of the test piece;

[0060] Step 3, phenolphthalein indicator test: break the test piece, spray phenolphthalein indicator on the split section, take the average of 10 points as the carbonization depth of the test piece;

[0061] Step 4, by fitting and analyzing the ultrasonic sound velocity value obtained in step (2) and the carbonization depth value obtained in step (3), the relationship between the two is established, such as ...

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Abstract

The invention discloses an ultrasonic method based concrete carbonation depth test method. The ultrasonic method based concrete carbonation depth test method comprises the following steps: firstly, forming a concrete test piece, and carbonating after a mould is detached and the concrete test piece is cured; secondly, performing an ultrasonic test on the test piece to acquire a sound velocity value of the test piece; thirdly, testing the carbonation depth of the test piece by adopting an indicator method; fourthly, performing fitting analysis on the acquired sound velocity value and a carbonation depth value to obtain the relationship between the sound velocity value and the carbonation depth value, and then acquiring the carbonation depth of corresponding concrete by testing the sound velocity value of the test piece. According to the concrete carbonation depth test method, a concrete carbonation depth test curve is established based on an ultrasonic method, and the carbonation depth of the concrete can be detected by only testing the sound velocity of ultrasonic waves without damaging the test piece; the integrity of a test sample is ensured during a testing process; the damage introduced by splitting the test piece is avoided; meanwhile, the accuracy of a test result is ensured; the test method is simpler.

Description

technical field [0001] The invention relates to a method for testing the carbonation depth of concrete, in particular to a method for testing the carbonation depth of concrete based on an ultrasonic method, and belongs to the field of building material detection. Background technique [0002] As an economical building material, concrete has been widely used in the construction field. After the concrete is prepared, the hydration reaction of cement will occur inside. After the hydration of the cement is completed, certain pores will be formed inside the cement stone. These pores become the CO 2 Enter the channel for carbonization inside the concrete, and the carbonation reaction process is shown in formulas (1) to (4). After carbonation of concrete, the hydration product Ca(OH) 2 (Molar volume: 33.2cm 3 / mol) is gradually transformed into CaCO 3 (Molar volume: 36.9cm 3 / mol), so that it fills the pores, and the molar volume increases by about 11%, so that the interior o...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N21/78
Inventor 潘钢华糜人杰匡桐周飞飞
Owner SOUTHEAST UNIV
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