![]() 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 will continue to increase after 60 seconds. It can be seen that the transmission process of water in the concrete test piece is very fast. 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. Table 1 lists the maximum absorbance of water and the time required to reach the maximum absorbance. 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. 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. 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. 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. 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.
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