SBS-Modified Asphalt Rejuvenator Dosage from FTIR Peak Ratios
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Solution Overview
Problem
Existing methods for determining the optimum dosage of synchronous rejuvenators for aged SBS-modified asphalt are time-consuming and imprecise, relying on empirical judgments or physical tests, and fail to accurately account for the aging degree of the asphalt.
Innovation Solution
A method using Fourier Transform Infrared Attenuated Total Reflection (FTIR-ATR) to measure infrared spectral characteristic absorption peaks before and after rejuvenation, establishing regression equations to quickly calculate the theoretical optimum dosage of the SBS molecular chain rejuvenator and pure asphalt component regulator based on peak area ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If empirical judgment or physical test methods are used to determine rejuvenator dosage, then the determination process is simple to operate, but the accuracy and efficiency are low and time-consuming
Solution Approach 1:
The patent replaces traditional mechanical/physical test methods with infrared spectral analysis. By using FTIR to detect characteristic absorption peaks of SBS molecular chains and establishing regression equations, the system achieves rapid, accurate dosage determination without time-consuming physical tests, thereby improving productivity while maintaining operational simplicity
Solution Approach 2:
The patent creates a mathematical model (regression equation) that copies the relationship between infrared peak area ratios and optimal rejuvenator dosage. This mathematical copy allows direct calculation of dosage from spectral data, eliminating the need for iterative physical testing and significantly improving determination efficiency
2Measurement precision
If traditional physical and rheological performance tests are conducted to determine optimum dosage, then comprehensive performance evaluation is achieved, but the process is time-consuming and laborious
Solution Approach 1:
The patent extracts the key diagnostic information from the complex aging process by focusing on specific infrared spectral characteristics (peak area ratios of SBS molecular chains). This extraction allows direct correlation with optimal dosage without requiring comprehensive time-consuming performance tests, achieving both accuracy and speed
Solution Approach 2:
The patent performs preliminary infrared spectral analysis to determine dosage before conducting any performance tests. By using the regression equation based on spectral data, the optimal dosage is determined in advance, eliminating the need for iterative testing and significantly reducing time loss
3Reliability
If macroscopic performance recovery tests are conducted with different proportions of rejuvenators, then the optimum dosage can be determined, but the process cannot quickly and accurately determine dosage based on aging degree
Solution Approach 1:
The patent replaces macroscopic performance recovery tests with infrared spectral analysis. By detecting characteristic absorption peaks and using regression equations, the system directly determines reliable dosage based on aging degree without requiring multiple trial tests, achieving both reliability and high productivity
Solution Approach 2:
The patent changes the measurement parameter from macroscopic performance properties to infrared spectral characteristics (peak area ratios). This parameter change enables direct, rapid determination of dosage based on aging degree while maintaining high reliability through the established regression model
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
Enables rapid and accurate determination of the optimum dosage for rejuvenators, achieving high rejuvenation efficiency up to 96.39% by precisely restoring the infrared spectral characteristic absorption peaks, thereby improving the performance of aged SBS-modified asphalt.
Implementation Method 1
detect the vibration intensity of its infrared spectral characteristic functional group polybutadiene at 968cm−1 by the Fourier Transform Infrared Attenuated Total Reflection (FTIR-ATR) module test
Implementation Method 2
Fourier Transform Infrared Attenuated Total Reflection (FTIR-ATR)
Implementation Method 3
the hydroxyl and carboxyl groups at the end of the aged and broken SBS molecular chain react with 1,4-butanediol diglycidyl ether, diisocyanate and diepoxy substances, epoxidized polybutadiene resin, trithiocyanuric acid, genipin, and triallyl isocyanurate under certain conditions so as to reconnect the broken SBS molecular chains
Implementation Method 4
the C—C group on the polybutadiene block that constitutes the three-dimensional network molecular structure of the SBS has relatively high bonding activity and is easily oxidized by thermal fracture to form oxidizing groups such as hydroxyl and carboxyl groups
Implementation Method 5
the unstable colloidal structure of the aged pure asphalt is rebalanced by small molecules pure asphalt component regulators, such as catalytic cracking oil slurry, aromatic oil, epoxidized soybean oil, waste oil, and other substances
Data Source
AI summary
The present invention precisely concerns the calculation method for the optimum two-component synchronous rejuvenator dosage for aged SBS-modified asphalt, including the following steps: (1) calculating the characteristic peak area ratio of unaged SBS molecular chain IB0 and unaged pure asphalt IB, aI0 and ARI0; (2) selecting four types of SBS-modified asphalt with different aging degrees and calculating their IBA, IB, aIA and ARIA; (3) adding the rejuvenator to above asphalts and calculating their post-rejuvenation BR, IB, aIR and ARIR; (4) establishing the regression equation between optimum rejuvenator dosage and characteristic peak area ratio requiring restoration due to aging; (5) as the given aged SBS-modified asphalt, substituting the characteristic peak area ratio requiring restoration into the equation to calculate the required optimum rejuvenator dosage. The invention can quickly and accurately determine the optimum SBS molecular chain rejuvenator dosage and pure asphalt component regulator in the aged SBS-modified asphalt.