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Method for testing concrete permeability based on multiple internal reflectance infra red spectrum

A technology of infrared spectroscopy and detection method, which is applied in the field of concrete permeability detection, can solve the problems of weak absorption bands, etc., and achieve the effect of simple operation, high sensitivity of operation, intuitive and reliable data

Inactive Publication Date: 2008-11-05
XIAMEN UNIV
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Problems solved by technology

Usually the change in the energy of a single reflection is quite small and the resulting absorption band is very weak

Method used

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  • Method for testing concrete permeability based on multiple internal reflectance infra red spectrum
  • Method for testing concrete permeability based on multiple internal reflectance infra red spectrum
  • Method for testing concrete permeability based on multiple internal reflectance infra red spectrum

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Embodiment Construction

[0030] The present invention will be described in detail below by way of examples.

[0031] (1) Effect of test piece thickness on concrete permeability

[0032] image 3 The dynamic process of water penetration in concrete specimens with different thicknesses of 2mm (a), 3mm (b), and 5mm (c) (the ratio of cement and sand is 1:2) was detected by multiple internal reflection infrared spectroscopy. Table 1 lists the maximum absorbance of water and the time required to reach the maximum absorbance. The broad spectrum peak in the figure is 3100~3650cm -1 Is the H-O-H stretching vibration peak, and 1625 ~ 1645cm -1 is the bending vibration peak of the H-O bond. It can be seen that the transmission process of water in the concrete test piece is very fast. For a concrete test piece with a thickness of 2mm, an obvious water peak signal can be detected at the interface within 2 seconds, and then the water peak signal will continue to increase with time, and the water peak signal wil...

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Abstract

A method for detecting the penetrability of the concrete based on a multiple internal reflection infrared spectrum relates to a method for detecting the penetrability of the concrete, and especially relates to a method for detecting the penetrability of the concrete based on a multiple internal reflection infrared spectrum technique. The invention provides a method for detecting the penetrability of the concrete based on multiple internal reflection infrared spectrum, wherein the method has the advantages of easy operation, high operation sensibility, intuitionistic and reliable data, suitability for continuously measuring the transmission characteristic of various species in the concrete dynamically, and significant actual meaning for evaluating the penetrability of concrete material. The preparation for sample piece of concrete comprises the following steps: wet curing the sample piece of concrete under room temperature, slicing according to the required thickness, grinding and drying. An MIR-FTIR test comprises the following steps: measuring with a Fourier Transform infrared spectrometer, collecting the infrared spectrogram of dried concrete sample / total internal reflection wafer interface as a background, and when the electrolytic cell is filled with solution to be measured, collecting the infrared spectrogram at different permeation time until a time when the peak intensity of spectrogram does not increase.

Description

technical field [0001] The invention relates to a method for detecting the permeability of concrete, in particular to a method for detecting the permeability of concrete based on multiple internal reflection infrared spectrum (MIR-FTIR) technology. Background technique [0002] In recent years, the durability and safety of reinforced concrete structures have attracted extensive attention, and a large number of related researches have been carried out. For a long time, the research and design of the durability and safety of reinforced concrete structures have been largely based on the evaluation of the compactness or permeability of concrete. The permeability of concrete materials has become an important parameter to evaluate its quality. The permeability of concrete refers to the ease of directional penetration, diffusion, and migration of gases, liquids, ions, or chemical molecules in concrete under the action of pressure, chemical potential, electric field, or concentrati...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N21/35G01N21/3563
Inventor 林昌健赵岩林俊人
Owner XIAMEN UNIV
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