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Characterization method of asphalt nanoscopic aggregation state

A technology of aggregate state and asphalt, which is applied in the field of characterization of nano-scale aggregate state of asphalt, which can solve the problems of complex molecular species and difficult chemical structure of asphalt.

Active Publication Date: 2020-10-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The molecular types of asphalt are complex, and it is difficult to study its chemical structure by experimental means

Method used

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  • Characterization method of asphalt nanoscopic aggregation state
  • Characterization method of asphalt nanoscopic aggregation state
  • Characterization method of asphalt nanoscopic aggregation state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] At T=298K, the effect of SBS modifier on the nanoscopic aggregation state of asphalt was evaluated. The centroid radial distribution functions of asphaltene, oil, and colloids of ordinary asphalt and SBS modified asphalt after smoothing are obtained as follows: figure 1 , 2 shown.

[0051] The aggregation of asphaltene molecules is characterized by the ratio of the sum of the 0.8-2nm asphaltene-colloid radial distribution function to the sum of the 0.8-2nm asphaltene-oil radial distribution function, as shown in image 3 shown.

[0052] It can be seen from the figure that the SBS modifier has a certain influence on the aggregation state of asphalt molecules at T=298K. The specific performance is: compared with ordinary asphalt molecules, there is no significant change in the aggregation of colloid molecules in SBS asphalt molecules. The molecular distribution is more uniform; the colloidal structure formed between asphaltene and pectin is more uniform.

Embodiment 2

[0054] The nanoscopic aggregation state of SBR modified asphalt was characterized at T=358K. The centroid radial distribution function of asphaltene, oil and colloid of SBR modified asphalt after smoothing treatment is obtained as Figure 4 shown.

[0055] Such as Figure 5 As shown, the asphaltene nano-aggregation state of SBR modified asphalt presents an obvious layered structure.

[0056] The aggregation of asphaltene molecules is characterized by the ratio of the sum of the 0.8-2nm asphaltene-colloid radial distribution function to the sum of the 0.8-2nm asphaltene-oil radial distribution function, as shown in Figure 6 shown.

Embodiment 3

[0058] The effect of SBS-MAH modifier on asphalt nano-aggregation state was evaluated at T=418K. The centroid radial distribution function of the smoothed SBS-MAH modified asphaltene, oil and colloid is obtained as follows: Figure 7 shown.

[0059] The aggregation of asphaltene molecules is characterized by the ratio of the sum of the 0.8-2nm asphaltene-colloid radial distribution function to the sum of the 0.8-2nm asphaltene-oil radial distribution function, as shown in Figure 8 shown.

[0060] It can be seen from the figure that the SBS-MAH modifier has a certain influence on the aggregation state of asphalt molecules at T=418K. The specific performance is: compared with ordinary asphalt molecules, the aggregation of oil molecules in SBS-MAH asphalt molecules is more significant, and the asphaltene 1. There was no significant change in the distribution of colloid molecules; there was no significant change in the colloidal structure formed between asphaltenes and colloids...

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Abstract

The invention discloses a characterization method of an asphalt nanoscopic aggregation state. The method belongs to the technical field of molecular dynamics simulation, is realized on the basis of amolecular dynamics theory and simulation calculation software MS (Matriales Studio) software, and comprises the following steps: (1) asphalt and modifier molecular modeling, including asphalt molecular construction and modified asphalt molecular construction; and (2) characterization of the asphalt nano aggregation state: calculation and analysis of a radial distribution function (RDF) are carriedout. The invention provides a method for simulating an asphalt nano aggregation state in Matriales Studio software. The problem that the asphalt nano-structure aggregation condition is difficult to evaluate in actual engineering or technical research is solved, so that a basis and a foundation are provided for judging the influence of the modifier on the asphalt nano-structure and further designing, researching and developing novel high-performance modified asphalt, and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of molecular dynamics simulation, and in particular relates to a method for characterizing the nanoscopic aggregation state of asphalt. Background technique [0002] Asphalt concrete pavement is the main form of expressways in my country. At present, asphalt is generally graded and evaluated according to the physical properties of asphalt. However, even asphalt of the same grade will show different road performance due to the differences in their chemical structures. , it is necessary to study its chemical structure. This is mainly because the chemical composition of the material plays a decisive role in the properties of the material; and the microstructure of the material is an important factor affecting the macroscopic properties of the material such as strength, hardness, elastic-plasticity, melting point, and thermal conductivity. The aggregation of asphalt molecules is the basis of asphalt colloidal st...

Claims

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Application Information

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IPC IPC(8): G06F30/25G06T17/00
CPCG06F30/25G06T17/00
Inventor 徐光霁马涛曹心原丁非凡傅子建张钰钦
Owner SOUTHEAST UNIV
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