FTIR Detection of SBS-Modified Asphalt Aging Stages
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Solution Overview
Problem
Existing methods for detecting the aging stages of SBS-modified asphalt are inefficient, requiring large-scale core drilling and suffering from low accuracy due to scattering effects, and fail to accurately characterize the aging stages of SBS-modified asphalt.
Innovation Solution
A detection and analysis method using FTIR that delineates the aging stages of SBS-modified asphalt by analyzing the changes in infrared spectrum characteristic functional groups of SBS copolymer and neat asphalt, eliminating the need for core drilling and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ATR-FTIR detection module is used to detect aging degree of asphalt, then detection speed is improved, but measurement precision deteriorates due to scattering effect and limited detection depth
Solution Approach 1:
The patent segments the complex asphalt aging detection into three distinct stages (SBS polymer swelling, SBS polymer degradation, and asphalt component imbalance) with specific functional group index thresholds for each stage. This segmentation enables rapid identification of the current aging stage while maintaining precision through stage-specific detection criteria.
Solution Approach 2:
The patent transforms the detection approach by monitoring multiple functional group index parameters (carbonyl index, sulfoxide index, aromatic index, aliphatic index) simultaneously rather than relying on a single parameter. This multi-parameter approach compensates for scattering effects and improves measurement precision while maintaining rapid detection capability.
2Reliability
If core drilling sampling method is used to obtain asphalt samples, then sample representativeness is improved, but productivity deteriorates due to heavy workload and transportation efficiency loss
Solution Approach 1:
The patent extracts the essential detection function from complex core drilling operations by using portable FTIR equipment to directly analyze asphalt samples obtained through simple sampling methods. This extraction eliminates the need for heavy core drilling, sample transportation, and laboratory processing while maintaining reliable detection results through on-site analysis.
Solution Approach 2:
The patent replaces the mechanical core drilling system with a chemical/optical detection system (FTIR spectroscopy). Instead of physically extracting large asphalt core samples through mechanical drilling, the system uses infrared radiation to obtain spectral information from minimal samples, dramatically improving productivity while maintaining reliability through molecular-level analysis.
3Measurement precision
If multiple repeated ATR tests are performed to accurately capture functional group changes, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent performs preliminary classification by identifying the current aging stage based on characteristic functional group patterns before conducting detailed quantitative analysis. This preliminary action reduces the need for multiple repeated tests by providing a rapid initial assessment that guides subsequent precision measurements, thereby reducing time loss while maintaining measurement precision.
Solution Approach 2:
The patent creates a universal detection framework that simultaneously determines aging stage, calculates multiple functional group indexes, and assesses overall aging degree in a single integrated process. This multi-functional approach eliminates the need for multiple separate repeated tests, achieving both high measurement precision and reduced time loss through consolidated analysis.
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 accurately determines the aging stages of SBS-modified asphalt with high detection accuracy, eliminating the need for large-scale core drilling and enabling timely maintenance measures to prolong the durability of the asphalt pavement.
Implementation Method 1
the attenuated total internal reflectance (ATR) module of Fourier transform infrared spectroscopy (FTIR) detection device has been widely employed to quantify the aging degree of the asphalt through detecting the functional group changes during the aging stages
Implementation Method 2
the attenuated total internal reflectance (ATR) module of Fourier transform infrared spectroscopy (FTIR) detection device
Data Source
AI summary
The present disclosure provides a detection and analysis method for rapid delineation of aging stages of styrene-butadiene-styrene (SBS) modified asphalt, including the following steps: performing a Fourier transform infrared spectroscopy (FTIR) test on unaged SBS-modified asphalt samples to obtain a copolymer index of IB0/S0 and neat asphalt functional group indexes, including the SI0, IB, aI0, ARI0, and CI0; performing the FTIR test on the aged SBS-modified asphalt samples to obtain an actual index of IB/S, SI, IB, aI, ARI, and CI; and delineating three aging stages of SBS-modified asphalt, including a polymer swelling stage, a polymer degradation stage and a component imbalance stage according to changes of functional group indexes. According to the present disclosure, the actual aging stages of the SBS-modified asphalt can be determined rapidly and accurately, providing a reasonable basis for the decision on pavement maintenance timing and mode.