A non-destructive testing method for the dielectric constant of large-scale inhomogeneous mixtures

Abstract

The invention discloses a nondestructive detect method of large-size nonuniform mixture dielectric constants. The nondestructive detect method of large-size nonuniform mixture dielectric constants comprises following steps: a large size nonuniform cuboid mixture is prepared; the length, the width, and the height are measured, and data is recorded; the two largest surfaces are subjected to processing using 60mm*60mm grids, and the grids are drawn with a marking pen; a dielectric constant instrument Percometer is adopted for measuring; the average value of the dielectric constant values of eachgrids is calculated; in MATLAB, simulation of rut plates and construction of a 30*30*5 three dimensional grid model are carried out, and the measured dielectric constant values of an upper surface anda lower surface are input into the model; linear equation fitting of the middle three layer dielectric constant values of the three dimensional grid model is carried out so as to obtain 4500 dielectric constant values of all the positions of the mixture; and at last, average value statistics calculating method is adopted so as to obtain the whole dielectric constant value of the mixture.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a non-destructive detection method for the dielectric constant of a large-scale inhomogeneous mixture. Background technique [0002] With the passing of the peak period of highway construction in our country, a large number of roads need to be maintained and repaired. Nowadays, most expressways and general highways usually use asphalt pavement as their main pavement form. The quality inspection of roads generally adopts core drilling sampling method, which not only consumes a lot of manpower and material resources, but also causes damage to the road. In addition, its detection efficiency is low. Problems such as incomplete detection have also plagued today's road maintenance workers. Therefore, the ground penetrating radar detection method that has emerged in recent years has been widely recognized because of its advantages of high efficiency, comprehensiveness and non-destructiven...

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Problems solved by technology

However, the time-domain measurement method has a single measurement point and is mainly used to measure ultra-thin materials. The test results can only represent the dielectric constant of a very small range of uniform media, and are not capable of measuring the dielectric constant of large-scale heterogeneous mixtures. function of

In summary, most of the existing dielectric constant measurement methods are destructive measurements, or for the measurement of small-sized homogeneous media, which cannot be well adapted to the actual road engineering. It helps to improve the detection accuracy of ground penetrating radar and is more suitable for actual roads. However, due to the large size and non-uniformity of the mixture, it is difficult to measure the dielectric constant of it by conventional methods

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