Method for evaluating water damage resistance of asphalt mixture based on molecular dynamics

An asphalt mixture and molecular dynamics technology, which is applied in the field of highway transportation, can solve the problems of data discreteness, inability to accurately and quantitatively operate the water damage resistance test method, and complexity, and achieve the effect of high test threshold.

Active Publication Date: 2020-05-15
CHANGAN UNIV
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Problems solved by technology

[0004] In order to overcome the existing asphalt mixture water damage resistance test method cannot be accurately quantified and the operation is complicated, the data is more affected by the external co

Method used

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  • Method for evaluating water damage resistance of asphalt mixture based on molecular dynamics
  • Method for evaluating water damage resistance of asphalt mixture based on molecular dynamics
  • Method for evaluating water damage resistance of asphalt mixture based on molecular dynamics

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Embodiment 1

[0043] The 90# asphalt commonly used in China was used as the prototype to establish the asphalt binder unit cell model, and the common acidic aggregate granite main mineral component SiO was used. 2 The aggregate unit cell model is established, and 150 water molecules are used as a water molecule layer to insert between the asphalt and the aggregate, and the water resistance of the asphalt mixture is determined by calculating the ratio of the adhesion work of the asphalt-aggregate interface in the anhydrous and water-containing states. Compromise performance, good or bad.

[0044] Step 1: According to the mass ratios of 90# asphalt four-component asphaltene, colloid, saturated phenol and aromatic phenol, which are 9.43%, 29.67%, 12.86% and 48.04%, assemble the asphalt binder molecular model in the Amorphous Cell module, asphalt Molecular models such as figure 1 As shown, the glial molecular model is as figure 2 As shown, the molecular model of saturated phenol is as imag...

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Abstract

The invention discloses a method for evaluating water damage resistance of an asphalt mixture based on molecular dynamics. The method is mainly characterized in that an asphalt-aggregate two-phase interface model and an asphalt-water-aggregate three-phase interface model are constructed by means of a molecular dynamic theory and simulation calculation software; the adhesion strength of asphalt andaggregate in the asphalt mixture is judged by calculating the adhesion work of the asphalt and the aggregate; and the water damage resistance of the asphalt mixture is quantitatively evaluated by calculating the ratio of the adhesion work of the asphalt mixture in a water-free state to the adhesion work of the asphalt mixture in a water-containing state, and the larger the ratio is, the strongerthe water damage resistance of the asphalt is. The method overcomes the defects that a water immersion method can only realize qualitative and experimental evaluation, cannot realize quantification and is greatly influenced by human subjective factors; and a surface energy method and an atomic force microscope method are complex in operation, high in technical requirements, long in consumed time,high in manufacturing cost, difficult to control experimental conditions and the like. The method can provide a basis and a foundation for material selection of the asphalt mixture, and thus has goodapplication prospects.

Description

technical field [0001] The invention relates to a technology for predicting water stability of asphalt mixture, in particular to a testing technology for quantitatively evaluating the adhesion strength of asphalt-aggregate interface by using molecular dynamics method, which belongs to the field of road traffic and surface technology. Background technique [0002] Asphalt pavement is comfortable to drive and easy to maintain, so it has become one of the main forms of high-grade pavement. However, the current service life of asphalt pavement is far below the design period, which also greatly increases the cost of maintenance. One of the main reasons is that water damage seriously affects the life of asphalt pavement. Therefore, before constructing asphalt pavement, it is first necessary to evaluate the water damage resistance (also known as water stability) of asphalt mixture. At present, the evaluation methods of asphalt mixture water stability are mainly divided into two c...

Claims

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Application Information

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IPC IPC(8): G16C10/00G16C20/20
CPCG16C10/00G16C20/20
Inventor 张洪亮黄嫚吕文江赖峰
Owner CHANGAN UNIV
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