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In-situ identification method of asphalt aging degree in mixture based on atomic force microscopy

A technology of atomic force microscopy and discrimination method, which is applied in the direction of scanning probe microscopy, scanning probe technology, and analysis of materials, which can solve the difficulty and uncertainty of increasing the identification of asphalt aging degree, long cycle time, and recovery efficiency Low-level problems, to achieve the effect of eliminating the extraction and recovery process, high testing efficiency, and improving accuracy

Active Publication Date: 2020-08-14
TONGJI UNIV
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Problems solved by technology

The conventional method is to extract and recover asphalt first, and then test the indicators such as penetration and viscosity. However, there are many disadvantages in the extraction of asphalt: long cycle time, low recovery efficiency, blank test calibration is required, and highly toxic organic solvents are used in experiments. There are secondary aging phenomena, unavoidable impurities such as solvents and mineral powders in recycled asphalt, and these shortcomings increase the difficulty and uncertainty of judging the aging degree of asphalt

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  • In-situ identification method of asphalt aging degree in mixture based on atomic force microscopy
  • In-situ identification method of asphalt aging degree in mixture based on atomic force microscopy
  • In-situ identification method of asphalt aging degree in mixture based on atomic force microscopy

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Embodiment

[0056] Such as figure 1 As shown, the method for in-situ discrimination of the aging degree of asphalt in the mixture based on atomic force microscopy in this embodiment includes the following steps:

[0057] (1), obtain the core sample on the old road surface on site, cut the core sample layer by layer, and obtain the asphalt mixture specimens of the upper layer and the middle layer, specifically:

[0058] (1-1), select the old asphalt pavement to be evaluated, and drill the pavement core sample with a coring machine;

[0059] (1-2) According to the layers of the old asphalt pavement, cut the core sample layer by layer to obtain the asphalt mixture specimens of the upper layer and the middle layer.

[0060] (2) The asphalt mixture specimens of the upper layer and the middle surface layer were processed by the method of "frozen storage and low-temperature cutting" to obtain microscopic observation samples of asphalt mixture, specifically:

[0061] (2-1), specimen freezing: W...

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Abstract

The invention provides a method for identifying asphalt aging degree based on atomic force microscopy; the method comprises the steps of (1) acquiring a core sample from an old pavement, cutting the core sample layer by layer to obtain an asphalt mixture test specimen of different layers; (2) treating the mixture test specimen by means of 'cryopreservation and low temperature cutting' to obtain an asphalt mixture microscopic observation sample; (3) observing an asphalt mortar area of the sample to obtain an asphalt mortar modulus map; (4) quantitatively analyzing the above modulus map to obtain asphalt micro modulus value; (5) grading asphalt ageing degree and level according to the relationship between the asphalt micro modulus value and macroscopic asphalt pavement performance. The method according to the invention is simple and easy to perform and allows asphalt ageing degree to be identified directly, the complex extraction and recovery process is omitted, and a new research method and idea are provided for identifying asphalt ageing degree.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to an in-situ discrimination method for asphalt aging degree in a mixture based on atomic force microscopy technology. Background technique [0002] More and more attention has been paid to the recycling of waste asphalt mixture, and judging the aging degree of asphalt in the old material is the premise and key to the recycling design of the old material. The conventional method is to extract and recover asphalt first, and then test the indicators such as penetration and viscosity. However, there are many disadvantages in the extraction of asphalt: long cycle time, low recovery efficiency, blank test calibration is required, and highly toxic organic solvents are used in experiments. There are secondary aging phenomena, and impurities such as solvents and mineral powders that are unavoidable in recycled asphalt, these shortcomings increase the difficulty and unce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/42G01Q60/24G01N1/28
CPCG01N1/286G01N33/42G01N2001/2873G01Q60/24
Inventor 刘黎萍王明孙立军
Owner TONGJI UNIV
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