A method and device for measuring water content of fresh concrete mixture based on dielectric constant

Abstract

The invention discloses a method and a device for determining the water content of a fresh concrete mixture based on dielectric constant. According to the method, a relative dielectric constant of concrete is tested based on the propagation rate attenuation of an electromagnetic wave in the fresh concrete mixture and the reflection principle of the electromagnetic wave on a metal plate of a testing device, and then, in accordance with the principle that the relative dielectric constant is relatively sensitive to water, the propagation velocity of the electromagnetic wave in the fresh concretemixture is enabled to vary so as to lead to the variation of the relative dielectric constant, thus the water content of the fresh concrete mixture can be measured. The method has the characteristicsof no contact between an electromagnetic transmitting and receiving device and a tested object, large testing area and wide water ratio testing range. The method can be used for overcoming the defectthat the traditional method is insufficient in concrete adaptability, largely impacted by environment, inaccurate and unreliable, has greatly increased precision and speed in testing the relative dielectric constant of concrete, and has the characteristics of great simplicity in manufacturing testing device, good simplicity and convenience, accurate test results and outstanding operation easiness.

Description

technical field [0001] The invention relates to a method for testing the moisture content of fresh concrete mixture based on the dielectric constant, and also relates to a device for measuring the moisture content of fresh concrete mixture, which is mainly used in concrete mixing stations, construction sites or other test sites to measure the moisture content of fresh concrete. The invention relates to the moisture content of a concrete mixture, which belongs to the field of cement concrete building materials. Background technique [0002] The water consumption of concrete mixture has a very important impact on its working performance, mechanical properties and durability. In actual engineering construction, there is often a problem of excessive water consumption, which causes the decline in the mechanical properties and durability of concrete in the later stage. Accurate, efficient and rapid measurement of moisture content of fresh concrete mixture is very important for qua...

AI Technical Summary

Problems solved by technology

The measurement results of these methods are greatly affected by the water content state of the material near the sample and the probe, and the measured results are uncertain and cannot accurately represent the overall water content of the material.

Many scholars have proposed the measurement of the moisture content of concrete and mortar after hardening, but there is no report on the measurement method of the moisture content of the freshly mixed concrete mixture in the flowing state.

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