Hydration degree measurement method for cement-based materials based on nuclear magnetic resonance

A technology of cement-based materials and measurement methods, which is applied in the measurement of hydration degree of cement-based materials, and in the field of hydration degree measurement of cement-based materials based on nuclear magnetic resonance. problems, to achieve the effect of reducing the test cycle, reducing the error of the test results, and ensuring the accuracy

Active Publication Date: 2013-11-20
HOHAI UNIV
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Problems solved by technology

At present, research on the hydration process of cement-based materials based on NMR technology has made great progress, but the relevant research is basically limited to the qualitative expression of

Method used

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  • Hydration degree measurement method for cement-based materials based on nuclear magnetic resonance
  • Hydration degree measurement method for cement-based materials based on nuclear magnetic resonance
  • Hydration degree measurement method for cement-based materials based on nuclear magnetic resonance

Examples

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Effect test

Embodiment 1

[0073] Embodiment 1, the test of the degree of hydration of ordinary Portland cement slurry with a water-cement ratio of 0.4:

[0074] The test adopts PQ-001 nuclear magnetic resonance analyzer, the magnetic field strength of the permanent magnet is 0.53T, the proton resonance frequency is 23MHz, and the constant temperature of the magnet is 32.0 degrees Celsius. Put the nuclear magnetic resonance tube filled with cement slurry of standard consistency into a thin-walled glass test tube with a diameter of 15 mm, and insert it into the probe coil of the instrument, and use CPMG (Carr-Purcell-Meiboom-Gill) pulse sequence test. Collect A with a hydration age of 7 days echo,1 (t,τ)~t curve, after two-component inversion analysis, A echo,1 (t,τ)~T 2 curves (such as figure 1 shown), the curve has obvious left peaks and right peaks, representing gel pores and capillary water, respectively. Using ORIGIN8.0 software to integrate the left peak and the right peak respectively, the S ...

Embodiment 2

[0075] Example 2: Test of hydration degree of ordinary Portland cement slurry with water-cement ratio 0.3:

[0076] The test adopts PQ-001 nuclear magnetic resonance analyzer, the magnetic field strength of the permanent magnet is 0.53T, the proton resonance frequency is 23MHz, and the constant temperature of the magnet is 32.0 degrees Celsius. Put the nuclear magnetic resonance tube filled with white cement of standard consistency into a thin-walled glass test tube with a diameter of 15mm, and insert it into the probe coil of the instrument, and use CPMG pulse sequence to test. Collect A with a hydration age of 7 days echo,1 (t,τ)~t curve, after two-component inversion analysis, A echo,1 (t,τ)~T 2 curves (such as figure 2 shown), the curve has obvious left peaks and right peaks, representing gel pores and capillary water, respectively. Using ORIGIN8.0 software to integrate the left peak and the right peak respectively, the S g =4663.30,S c =1814.18, so The obtained α...

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Abstract

The invention discloses a hydration degree measurement method for cement-based materials based on nuclear magnetic resonance, which belongs to the technical field of cement material measurement. The hydration degree measurement method disclosed by the invention adopts a nuclear magnetic resonance technique to test nuclear magnetic signals of the cement-based materials at different ages; a relation between transverse relaxation time and the nuclear magnetic signals is obtained by inverse analysis; furthermore, a ratio of nuclear magnetic semaphores of left and right peaks is taken as a nuclear magnetic signal ratio of gel pore water and capillary pore water, and then the hydration degree of the cement-based materials to be detected at the age is solved according to a Powers model. Compared with traditional methods including a muffle furnace method and the like, the hydration degree measurement method disclosed by the invention is a nondestructive testing method, can reduce operation steps of a test greatly and shorten a testing period greatly, and can be used for monitoring samples continuously so as to ensure that the errors of test results are small; meanwhile, the method disclosed by the invention does not need to calibrate nuclear magnetic resonance semaphores and sample water content and directly adopts the ratio of the nuclear magnetic semaphores of the left and right peaks, namely a microstructure factor, as a parameter to represent the hydration degree, and therefore, measurement procedures and errors are reduced.

Description

technical field [0001] The invention relates to a method for measuring the degree of hydration of cement-based materials, in particular to a method for measuring the degree of hydration of cement-based materials based on nuclear magnetic resonance, and belongs to the technical field of cement material measurement. Background technique [0002] The degree of hydration of cement-based materials is the degree of hydration reaction, that is, compared with the state of complete hydration of cementitious materials, the degree of hydration reaction at a certain moment can be expressed by the heat of hydration, chemically bound water method, etc. . At present, the methods for determining the hydration degree of cement-based materials mainly include hydration heat method, muffle furnace method, thermogravimetric analysis method, etc. Among them, muffle furnace method, thermogravimetric analysis method and other methods need to stop hydration, grinding and drying , cooling, weighing,...

Claims

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Application Information

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IPC IPC(8): G01N24/08
Inventor 赵海涛吴胜兴陈徐东黄冬辉陈育志祁潇徐东芝
Owner HOHAI UNIV
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