Measurement device and measurement method for measuring oxygen diffusion coefficient and consumption coefficient in bituminous mixture

A technology of asphalt mixture and diffusion coefficient, which is applied in the direction of measuring devices, analysis materials, suspension and porous material analysis, etc., can solve the problems of large measurement error, high professional requirements, inaccurate voids and void passages, and achieve easy Portability, uniform heating, and simple installation

Pending Publication Date: 2020-03-06
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the inaccuracy of the voids and void channels in the asphalt mixture measured by the X-ray computed tomography method, which leads to large measurement errors, and the X-ray computed tomography equipment has high requirements for the professionalism of the operators, the present invention proposes A device and method for measuring oxygen diffusion coefficient and consumption coefficient in asphalt mixture, which is to measure the oxygen accessibility of asphalt mixture according to the principle of oxygen concentration difference through gas diffusion, the measurement result is accurate and the operation process is simple

Method used

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  • Measurement device and measurement method for measuring oxygen diffusion coefficient and consumption coefficient in bituminous mixture
  • Measurement device and measurement method for measuring oxygen diffusion coefficient and consumption coefficient in bituminous mixture
  • Measurement device and measurement method for measuring oxygen diffusion coefficient and consumption coefficient in bituminous mixture

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Experimental program
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Embodiment 1

[0046] The measuring device of the oxygen diffusion coefficient and consumption coefficient in the asphalt mixture of this embodiment has three gas valve ports 6 on the upper test chamber, which are respectively the first upper gas valve port, the second upper gas valve port and the third upper gas valve port. The gas valve port, the first upper gas valve port is arranged on the upper cover plate 2, which is an exhaust port, and the exhaust port is connected to the outside of the incubator 29 through the connecting hose 5, the second upper gas valve port and the third upper gas valve port The ports are all arranged on the side wall 1 of the upper cavity, the second upper gas valve port is connected with the humidifying unit 25 on the control box 21 through the connecting hose 5, the third upper gas valve port is the air inlet, and the air inlet is connected through the connecting soft The pipe 5 is connected to the outside of the incubator 29; there are three gas valve ports 6 ...

Embodiment 2

[0060] Different from Example 1, the measuring device of the oxygen diffusion coefficient and consumption coefficient in the asphalt mixture of the present embodiment, its rubber ring fixing frame is formed by splicing two steel rings 26 with a semicircular cross-section. The middle part of the steel ring 26 forms a steel ring splicing fixed port 11, and the steel ring splicing fixed port 11 is connected by a screw 7 and a nut 30, and the rubber ring 10 is tightly hooped on the side of the rubber ring fixing plate 12 by the steel ring 26; The end face is connected with the bottom of the side wall 1 of the upper cavity, and the lower end face of the lower rubber ring is connected with the top of the side wall 4 of the lower cavity.

[0061] Six fans 13 are arranged on the inner side wall of the incubator 29, and the angle formed between the central axis of the fan 13 and the side wall bus bar of the incubator 29 is 45°.

[0062]Step (4) Calculate the oxygen diffusion coefficien...

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Abstract

The invention discloses a measurement device and a measurement method for measuring an oxygen diffusion coefficient and consumption coefficient in a bituminous mixture, and belongs to the technical field of performance measurement of a road construction material. The measurement device particularly comprises a test box, a heat preservation box and a control box connected with the test box and theheat preservation box; the test box is arranged in the heat preservation box; the test box comprises an upper test cavity, a middle test sample cavity and a lower test cavity; the middle test sample cavity is used for placing a to-be-measured compacted bituminous mixture; the upper test cavity is communicated with the lower test cavity through the middle test sample cavity; oxygen concentration sensors are arranged on both the upper test cavity and the lower test cavity; and the oxygen concentration sensors are used for detecting concentration of oxygen in gas in the upper test cavity or the lower test cavity. The oxygen diffusion coefficient and the oxygen consumption coefficient in the compacted bituminous mixture are measured by utilizing the device disclosed by the invention; a simulated environment of the device is close to a real pavement environment; accuracy of measured data can be ensured; reliable reference can be provided for evaluating ageing sensitivity of the bituminous mixture; and the measurement device and the measurement method are simple in experiment operation process.

Description

technical field [0001] The invention belongs to the technical field of performance measurement of road construction materials, and in particular relates to a measuring device and a measuring method for oxygen diffusion coefficient and consumption coefficient in asphalt mixture. Background technique [0002] Asphalt mixture is a construction material widely used in roads, airports, parking lots, etc. The aging degree of asphalt binder in asphalt mixture directly affects the performance of asphalt mixture, thus affecting the service life of the road surface. The study found that no matter what kind of pavement structure the asphalt binder is applied on, it will age to varying degrees over time. Therefore, by measuring the aging sensitivity of asphalt mixture, we can develop better performance anti-aging Asphalt mixture is the key to improving the durability of asphalt pavement. [0003] Oxygen accessibility is one of the important factors to evaluate the aging sensitivity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N7/10
CPCG01N7/10G01N15/082G01N15/0893
Inventor 温永孙丽君裴建中张久鹏李蕊邢向阳
Owner CHANGAN UNIV
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