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A method for detecting saturation of cement-based materials based on low-field nuclear magnetic resonance technology

A technology of low-field nuclear magnetic resonance and cement-based materials, which is applied in the direction of analysis by nuclear magnetic resonance, material analysis through resonance, and material analysis. It can solve the problem of inaccurate detection of cement-based material saturation and achieve convenient testing. Fast, less disturbed, and less sample consumption

Active Publication Date: 2017-12-08
HOHAI UNIV
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Problems solved by technology

Because the relaxation time of chemically bound water is very short (about 10μs), it cannot be detected by low-field NMR instruments. The signal detected by the instrument comes from the evaporable physically bound water that has not participated in the chemical reaction, so it is low The change of the peak amplitude I(t) obtained by the field NMR instrument with the hydration time reflects the change of the evaporable water content in the cement paste, so the detection of the saturation of the cement-based material becomes inaccurate

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  • A method for detecting saturation of cement-based materials based on low-field nuclear magnetic resonance technology
  • A method for detecting saturation of cement-based materials based on low-field nuclear magnetic resonance technology
  • A method for detecting saturation of cement-based materials based on low-field nuclear magnetic resonance technology

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, a kind of cement-based material saturation detection method based on low-field nuclear magnetic resonance technology designed by the present invention, in the actual application process, specifically includes the following steps:

[0027] Step 001. Configure the target cement-based material, divide it into at least 5 target cement-based samples, and preset the age t corresponding to each target cement-based sample, and the age corresponding to each target cement-based sample t are different from each other, and then go to step 002.

[0028] Step 002. For each target cement-based sample, perform the following steps 00201-step 00203 to obtain the first signal amplitude I of each target cement-based sample corresponding to its age t 1 (t), the second signal amplitude I 2 (t), then enter ...

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Abstract

The invention relates to a cement-based material saturation degree detection method based on a low field nuclear magnetic resonance technology. The saturation degree detection can be accurately realized by using a fire-new design concept is used and combining the cement-based sample nuclear magnetic resonance longitudinal relaxation restoration signal detection; the test process is convenient and fast; the sample consumption is low; in addition, the nuclear magnetic resonance longitudinal relaxation restoration signal detection process is convenient and fast; the interference is small; the back calculation is not needed; the data processing quantity is small.

Description

technical field [0001] The invention relates to a method for detecting the saturation of cement-based materials based on low-field nuclear magnetic resonance technology, and belongs to the technical field of building materials. Background technique [0002] The hydration, autogenous shrinkage, drying shrinkage, creep, and strength changes of cement-based materials in the early stage are closely related to their moisture content, that is, their saturation. The circulation and chloride ion transport properties have an important influence, so the saturation of cement-based materials is one of the important indicators concerned in the fields of building materials and civil engineering. [0003] All performance changes of cement-based materials originate from hydration. The hydration process is accompanied by the generation of heat of hydration. At the same time, it has a great impact on various physical and chemical properties of the material in the early and late stages. Theref...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/085
Inventor 赵海涛祁潇黄冬辉王潘绣杨培强邸云菲殷新龙杨睿黄煜煜木沙洪彬秦骁
Owner HOHAI UNIV
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