Test method for estimating dielectric constant of asphalt pavement

Abstract

The invention discloses a test method for estimating the dielectric constant of an asphalt pavement. The asphalt pavement is formed by mixing asphalt, aggregate and filler according to a certain proportion at high temperature. In order to accurately evaluate the internal diseases of the asphalt pavement material and the thickness of each structural layer of the asphalt pavement, a ground penetrating radar is generally adopted for detection. However, the map signal of the ground penetrating radar is very complex, and the asphalt pavement is a non-uniform material, so that the dielectric constant of the pavement is difficult to solve, and the thickness of each reflecting layer of the asphalt pavement is difficult to obtain accurately. An AC-13 type asphalt pavement is taken as a test object,asphalt pavement structure layers with different thicknesses are arranged, a large number of detection tests are carried out by utilizing a ground penetrating radar, the dielectric constant change rule of the asphalt pavement is analyzed according to a radar map, and the test method for estimating the dielectric constant of the asphalt pavement is provided.

Description

technical field [0001] The invention belongs to the field of road engineering, in particular to a test method for estimating the dielectric constant of asphalt pavement. Background technique [0002] Asphalt pavement is formed by mixing asphalt, aggregates and fillers at high temperature and rolling. Due to the influence of asphalt mixture gradation, asphalt dosage, long-distance transportation, mixing and rolling process, the distribution of voids inside the asphalt pavement is uneven. The smaller the void ratio, the greater the dielectric constant, and the higher the void ratio, the higher the dielectric constant. small. Because the dielectric constant of asphalt pavement is very important to evaluate the uniformity and road performance of the pavement. Therefore, in the field of road engineering, great attention has been paid to the solution of the pavement dielectric constant. The traditional methods for solving the dielectric constant of asphalt pavement include dire...

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Problems solved by technology

[0006] In view of the fact that the direct coring method in the prior art is destructive and cannot obtain core samples on a large scale in actual engineering, the amplitude total reflection method can only qualitatively compare the differences between different asphalt mixtures, but cannot quantitatively evaluate the asphalt pavement The def

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