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A Research Method of Asphalt Mixture Mechanical Properties Based on Atomic Force Microscopy

An asphalt mixture, atomic force microscopy technology, applied in scanning probe microscopy, scanning probe technology, instruments, etc., can solve the problem of not truly reflecting the aging degree of asphalt, complicated operation, and comparative study of mechanical properties of asphalt mixture. complex problems, to achieve reliable and effective observation results, simple preparation process, and good mechanical properties images.

Active Publication Date: 2019-04-16
TONGJI UNIV
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Problems solved by technology

[0003] Asphalt pavement is mainly asphalt mixture. Asphalt mixture is a granular composite material composed of asphalt, aggregates and pores. Its performance is affected by factors such as the proportion of each component, microstructure and interaction between components. The research on the mechanical properties of the mixture is also more complicated
The current standard recommends the test method of extraction and recovery, which is not only complicated to operate, but also the research results cannot truly reflect the aging degree of asphalt

Method used

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  • A Research Method of Asphalt Mixture Mechanical Properties Based on Atomic Force Microscopy
  • A Research Method of Asphalt Mixture Mechanical Properties Based on Atomic Force Microscopy
  • A Research Method of Asphalt Mixture Mechanical Properties Based on Atomic Force Microscopy

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Embodiment

[0036] Such as figure 1 As shown, a research method for the mechanical properties of asphalt mixture based on atomic force microscopy, the method includes the following steps:

[0037] Step 1: Prepare the asphalt mixture sample by freezing and low-temperature cutting method, which specifically includes the following steps:

[0038] (101) Specimen Freezing: Wrap the asphalt mixture specimen to be studied with plastic wrap, freeze in a constant temperature freezer for a set time, and the temperature of the constant temperature freezer is -9°C to -11°C. The temperature of the warm-freezer is -10°C, and the freezing time is greater than or equal to 24 hours.

[0039] (102) Specimen cutting: Under the action of cooling water, use a stone cutting machine to cut the asphalt mixture specimen into 30×20×10mm cuboid asphalt mixture specimens. The specimen cutting is completed within 10 minutes to prevent the The thermal effect will cause the softening of the asphalt mixture sample, af...

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Abstract

The invention relates to a mechanical characteristic researching method of an asphalt mixture based on an atomic force microscopic technology. The method comprises the following steps that (1) a freezing low-temperature cutting method is used to prepare an asphalt mixture sample; (2) an AFM-QNM nano-scale mechanical property quantification module of an atomic force microscope is used to observe the asphalt mixture sample, mechanical characteristic images, including a modulus characteristic image, an anchoring strength characteristic image, a dissipation energy characteristic image and a deflection characteristic image, of the asphalt mixture sample are obtained; and (3) Nanoscope Analysis software is used analyze the mechanical characteristic images quantitatively, and the modulus value, anchoring strength value, dissipation energy value and deflection value of a component to be researched are obtained. The method provided by the invention is simple and easy to operate, and on the premise that different components of the mixture are not separated, the mechanical characteristic of the micro nano-scale of certain component can be measured directly, and basis is provided for in-situ discrimination of asphalt performance.

Description

technical field [0001] The invention relates to a research method for the mechanical properties of asphalt mixture, in particular to a research method for the mechanical properties of asphalt mixture based on atomic force microscopy technology. Background technique [0002] With the popularization and application of asphalt pavement regeneration technology, how to effectively estimate the residual value of pavement milling materials, especially for the determination of the aging degree of asphalt binder, has become a major concern of road researchers. [0003] Asphalt pavement is mainly asphalt mixture. Asphalt mixture is a granular composite material composed of asphalt, aggregates and pores. Its performance is affected by factors such as the proportion of each component, microstructure and interaction between components. The research on the mechanical properties of the mixture is also more complicated. The current standard recommends the test method of extraction and reco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01Q30/20G01Q60/24
CPCG01Q30/20G01Q60/24
Inventor 刘黎萍王明
Owner TONGJI UNIV
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