Fluorescence Spectroscopy for Bitumen Aging Assessment
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Solution Overview
Problem
Current methods for determining the aging resistance of bitumen materials are time-consuming and lack a reliable, rapid testing method for quality control, particularly in the recycling of road construction bitumen, where the reuse rate is low due to inadequate quality control.
Innovation Solution
A method involving exposure to monochromatic excitation radiation at specific wavelengths to measure fluorescence intensities, with ratios between these intensities used as key figures to assess the aging state and resistance of bitumen, allowing for quick and easy analysis of bitumen materials using a portable device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional time-consuming tests are used to determine aging resistance, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent replaces traditional mechanical/chemical testing methods with fluorescence spectroscopy. The aging resistance of bitumen is determined by measuring fluorescence intensity ratios at different excitation wavelengths (e.g., 270 nm and 360 nm), which provides rapid, non-destructive analysis without requiring time-consuming laboratory tests.
Solution Approach 2:
The patent changes the measurement parameter from traditional physical/chemical properties to fluorescence spectral characteristics. By monitoring changes in fluorescence intensity ratios at specific wavelengths, the method provides a rapid indicator of aging state that correlates with bitumen quality without requiring extensive testing time.
2Productivity
If fluorescence spectroscopy is used to rapidly assess aging state, then productivity is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent employs a feedback mechanism by measuring fluorescence intensity ratios at multiple excitation wavelengths and comparing them against reference values or established ranges. This allows for rapid assessment while maintaining accuracy through systematic comparison and validation of the fluorescence characteristics against known standards.
Solution Approach 2:
The patent segments the fluorescence spectrum analysis into specific wavelength regions (e.g., UV region around 270 nm and visible region around 360 nm). By focusing on discrete, characteristic wavelength ranges rather than analyzing the entire spectrum, the method achieves rapid measurement while preserving diagnostic precision for aging detection.
3Reliability
If comprehensive quality control is implemented for recycled bitumen, then reliability is improved, but device complexity and time investment increase
Solution Approach 1:
The patent extracts the essential aging detection capability from complex comprehensive quality control systems. By using fluorescence spectroscopy to measure specific spectral characteristics (intensity ratios at defined wavelengths), the method isolates the key indicator of aging resistance, enabling reliable quality assessment without requiring complex multi-parameter analysis systems.
4Measurement precision
If detailed analysis of bitumen microstructure is performed, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies partial action by measuring fluorescence intensity ratios at specific, strategically selected wavelengths (such as 270 nm and 360 nm) rather than performing comprehensive spectral analysis across the entire range. This selective measurement approach provides sufficient precision for aging detection while significantly reducing the time required compared to full spectral characterization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces testing time, enabling real-time assessment of bitumen aging resistance, facilitating decision-making on initial use or reuse, and improving the selection process by distinguishing between aging-resistant and non-resistant bitumen samples.
Implementation Method 1
exposure of the bitumen material with a substantially monochromatic first excitation radiation of a first excitation wavelength; measurement of the intensity of a first fluorescence radiation excited by the first excitation radiation
Data Source
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AI summary
The invention relates to a method and to a device (1) for determining a material property, in particular the aging state or the aging resistance, of a bitumen material (2), comprising the steps: applying a substantially monochromatic first excitation radiation (4) of a first excitation wavelength (λ1) to the bitumen material (2); measuring the intensity (II) of a first fluorescence radiation, excited by the first excitation radiation (4), at a measurement wavelength; applying a substantially monochromatic second excitation radiation (6) of a first excitation wavelength (λ2) to the bitumen material (2); measuring the intensity (12) of a second fluorescence radiation, excited by the second excitation radiation (6), at the measurement wavelength; determining a first key figure (K1) for the material property of the bitumen material (2) from the ratio between the intensity (12) of the second fluorescence radiation to the intensity (II) of the first fluorescence radiation.