Method for measuring moisture content of sandstone based on interdigital capacitor

Abstract

The invention discloses a method for measuring the moisture content of sandstone based on an interdigital capacitor. The method is rapid in detection, high in measurement precision, accurate in measurement data and low in cost. The method comprises the following steps: S1, respectively putting a plurality of groups of standard sandstone samples with different preset moisture contents into a capacitance device and taking the standard sandstone samples as a capacitance medium, and sequentially measuring capacitance values of the capacitance device corresponding to the standard sandstone samples with different moisture contents; S2, establishing a mathematical model of the capacitance value and the moisture content according to the capacitance value measured in the step S1, and obtaining a relational expression of the capacitance value and the moisture content; S3, putting the to-be-measured sandstone into the capacitance device to serve as a capacitance medium, and measuring the capacitance value of the capacitance device corresponding to the to-be-measured sandstone; and S4, substituting the capacitance value measured in the step S3 into the relational expression of the capacitance value and the water content to calculate the water content of the sandstone to be measured. The method is suitable for measuring the water content of the sandstone.

Description

【Technical field】 [0001] The invention relates to the technical field of material performance detection, in particular to a method for measuring the water content of sand and gravel based on interdigital capacitance. 【Background technique】 [0002] At present, the methods of testing moisture content can be divided into two categories: direct measurement method and indirect measurement method. The direct measurement method is mainly the manual drying method, which is often used in the actual production process of concrete. However, the manual drying method not only takes a long time and has a long interval, but also has serious discrepancies between the obtained data and the actual materials used. Hysteresis, and the measured moisture content cannot be representative due to the uneven moisture distribution of the material, which is difficult to have guiding significance for actual production. Indirect measurement methods mainly include conductometric method and microwave met...

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Problems solved by technology

The so-called conductivity method (such as the Chinese utility model patent CN212083302U) is based on the principle that the resistance of the water-containing material changes with its water content. Therefore, the water content can be obtained indirectly by measuring the electrical conductivity of the material, but this method It is easily affected by the temperature, humidity and sample looseness of the environment, so the measurement accuracy is low; the so-called microwave method (such as Chinese utility model patent CN212083273U) is determined according to the frequency and energy of the microwave absorption and reflection of the water-containing material. But its cost is high, and the measurement result is greatly affected by the bulk density of the material

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