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Measuring method of asphalt pavement thickness and dielectric constant at compaction site

A technology of asphalt surface layer and dielectric constant, applied in the direction of dielectric performance measurement, radio wave measurement system, measuring device, etc., can solve the problems of instability, low accuracy of dielectric constant, large error, etc., and eliminate The impact of measurement results, effective control of construction quality, and the effect of reducing measurement time

Active Publication Date: 2020-12-04
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only applicable to dry asphalt pavement. In the compaction site, the amplitude A 0 and the measurement of the time difference Δt will be obviously interfered by the water film, so the calculated dielectric constant and the thickness of the asphalt surface layer deviate greatly from the actual value
[0007] In order to solve this problem, the common practice in the prior art is to approach the real permittivity by post-correcting the reflected waveform, but these methods do not eliminate the cause of the measurement deviation (that is, the interference of the water film on the surface of the asphalt pavement) , but it is corrected by experience, the dielectric constant obtained by it is often not accurate and not stable, and the algorithm is relatively complicated, and the effect in practical applications is not ideal
[0008] To sum up, it is difficult to detect the thickness and dielectric constant of asphalt pavement at the compaction site with the measurement method of asphalt pavement thickness and dielectric constant in the prior art, and the error is large, which is not conducive to the quality of pavement compaction. control

Method used

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  • Measuring method of asphalt pavement thickness and dielectric constant at compaction site
  • Measuring method of asphalt pavement thickness and dielectric constant at compaction site
  • Measuring method of asphalt pavement thickness and dielectric constant at compaction site

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Embodiment 1

[0054] For the antenna group, set the distance between the centers of the close-range antennas x 01 is 40cm, the distance between the center of the remote antenna is x 02 The distance d between each antenna and the surface of the water-bearing asphalt layer is 30cm.

[0055] 6cm group: the real height of the asphalt layer is 6cm, and the dielectric constant is 6.111.

[0056] 1) The method of this application (with a metal plate): through the antenna host (a computer connected to the antenna, which can be used for detection of electromagnetic wave time and data calculation, the same below), the electromagnetic wave of the short-range transceiver antenna is obtained from the transmitting antenna to the surface of the metal plate and The round-trip time t reflected to the receiving antenna 11 It is 2.8648ns, the round-trip time t for the short-distance transceiver antenna electromagnetic wave from the transmitting antenna to the bottom of the surface water-bearing asphalt laye...

Embodiment 2

[0061] For the antenna group, set the distance between the centers of the close-range antennas x 01 is 40cm, the distance between the center of the remote antenna is x 02 The distance d between each antenna and the surface of the water-bearing asphalt layer is 30cm.

[0062] 8cm group: the real height of the asphalt layer is 8cm, and the dielectric constant is 6.111.

[0063] 1) The method of this application (with a metal plate): Obtain the round-trip time t of the short-distance transceiver antenna electromagnetic wave from the transmitting antenna to the surface of the metal plate and reflected to the receiving antenna through the antenna host 11 It is 2.8648ns, the round-trip time t for the short-distance transceiver antenna electromagnetic wave from the transmitting antenna to the bottom of the surface water-bearing asphalt layer and reflected to the receiving antenna 1 +t 12 is 4.1721ns, the difference between the two propagation times Δt 1 It is 1.3073ns; the round-...

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Abstract

The invention discloses a method for measuring thickness and dielectric constant of an asphalt surface layer on a compaction site, which comprises the following steps of: S1, arranging remote transmitting and receiving antennas above the asphalt surface layer, arranging near transmitting and receiving antennas on a connecting line between the remote transmitting and receiving antennas, and arranging a reflecting plate also; S2, acquiring the time an electromagnetic wave propagates from the remote transmitting antenna and the near transmitting antenna to the reflecting plate and to the remote transmitting antenna and the near receiving antenna and obtaining the time the electromagnetic wave propagates from the remote transmitting antenna and the near transmitting antenna to the bottom of the asphalt surface layer to the remote receiving antenna and the near receiving antenna; S3, calculating the difference between the propagation time of the electromagnetic wave passing through the bottom of the asphalt surface layer and passing through the reflecting plate between the remote antennas and calculating the difference between the propagation time of the electromagnetic wave passing through the bottom of the asphalt surface layer and passing through the reflecting plate between the near antennas; S4, calculating the dielectric constant and the thickness of the asphalt surface layer.According to the method for measuring thickness and dielectric constant of the asphalt surface layer on the compaction site, the water film interference of the asphalt surface layer on the compactionsite can be eliminated, the accurate propagation time can be measured, the dielectric constant and the thickness of the asphalt pavement can be obtained continuously without damage, the operation issimple and convenient, and the method can be implemented quickly.

Description

technical field [0001] The invention belongs to the field of asphalt pavement detection, and in particular relates to a method for measuring the thickness and dielectric constant of an asphalt surface layer at a compaction site. Background technique [0002] The thickness of asphalt pavement is the main content of pavement design, which directly affects the strength and service life of pavement. The dielectric constant can reflect the degree of compaction, porosity and segregation of the asphalt mixture. By measuring the dielectric constant of the asphalt mixture and the thickness of the asphalt surface layer, the construction quality of the asphalt pavement can be effectively controlled. [0003] At this stage, the measurement of the thickness and dielectric constant of the asphalt surface layer is mainly after the pavement is completed. One way is to test the thickness and compaction of the pavement through core sampling. This method not only measures the pavement Damage,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26G01B15/02G01S13/08
CPCG01B15/02G01R27/2617G01S13/08G01N22/00G01N33/42
Inventor 凌天清崔立龙周刚李汝凯袁鑫张君张清桃邱虹雨
Owner CHONGQING JIAOTONG UNIVERSITY