Abstract
Thermo-oxidative ageing is one of the main factors affecting bitumen performance. At present, the research on bitumen ageing has entered the micro stage. The purpose of this paper was to study the relationship between nano-morphology parameters and properties of bitumen of bitumen during the ageing process. To this end, bitumen with different ageing degrees was prepared in this paper, and Atomic force microscopy samples with different cooling rates were prepared. The relationship between ageing degree of bitumen and nano-morphology parameters was analyzed. A functional relationship model between nano-morphology parameters and properties of bitumen was established. The results show that the percentage of bee-like structure area (), maximum amplitude () and roughness () increased with the increase of ageing degree. the percentage of bee-like structure area, the maximum amplitude and the roughness increase with the increase of cooling rate. With the increase of the percentage of bee-like structure area, the maximum amplitude and the roughness, the viscosity of bitumen at 60 °C increases, penetration decreases, and softening point increases. There is a nonlinear relationship between the nano-morphology parameters and properties of bitumen.
Highlights
The ageing of bitumen is the result of components changes [1]
Xu et al [13] used molecular dynamics to study the effect of thermal-oxidative ageing on bitumen properties, including the nano-aggregation behaviour of asphaltene molecules and the translation ability of asphalt molecules
The research method of this paper provides a reference for improving the calculation accuracy of the bitumen nano-morphology parameters, and the research results provide a new idea for the study of the quantitative relationship between the technical properties and the nano-morphology parameters of bitumen, which is of great significance
Summary
The ageing of bitumen is the result of components changes [1]. Light, heat, oxygen, water and other factors can cause the ageing of bitumen, which accounts for most of the total ageing [2,3,4]. Atomic force microscopy (AFM) is becoming more and more popular among professionals in the field of bitumen micro-detection [33,34,35]. Bitumen with different ageing degree was prepared, and Atomic force microscopy (AFM) samples with different cooling rates were prepared respectively. It has been difficult for researchers to establish a quantitative relationship between the nano-morphology parameters and the technical properties of bitumen. The research method of this paper provides a reference for improving the calculation accuracy of the bitumen nano-morphology parameters, and the research results provide a new idea for the study of the quantitative relationship between the technical properties and the nano-morphology parameters of bitumen, which is of great significance
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