Bitumen Stability Assessment via Near IR Inflection Point
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Solution Overview
Problem
The compatibility of bitumen streams, particularly when mixed with recycled and virgin streams, is difficult to predict, leading to potential premature failure of road paving materials due to instability issues.
Innovation Solution
A method involving the determination of an inflection point value for mixed bitumen product streams using near IR laser light and non-solvent addition, allowing for the assessment of stability and modification by adjusting the bitumen feed streams or adding stabilizing additives when the inflection point occurs at a ratio of less than 2 mL of non-solvent per gram of bitumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bitumen streams are mixed without stability assessment, then manufacturing process is simple and fast, but product reliability deteriorates due to incompatibility and premature failure
Solution Approach 1:
The patent applies preliminary action by performing stability assessment through inflection point determination before the bitumen blend is used in road paving applications. The method measures the inflection point of asphaltene precipitation as a function of non-solvent addition in advance, allowing compatibility issues to be detected and addressed before final product deployment, thus preventing premature failure while maintaining relatively simple processing.
2Reliability
If inflection point measurement is performed to assess bitumen stability, then product reliability is improved, but measurement precision requirements increase
Solution Approach 1:
The patent uses an intermediary approach by introducing a non-solvent as a mediator substance to induce controlled asphaltene precipitation. The non-solvent acts as a probe that interacts with the bitumen system, causing measurable changes in light transmission as asphaltenes precipitate. This intermediary substance enables the detection of inflection points that indicate stability thresholds, providing reliable stability assessment through controlled interaction rather than direct measurement of inherent properties.
3Productivity
If bitumen compatibility is not assessed, then manufacturing time is reduced, but product durability worsens due to premature failure
Solution Approach 1:
The patent replaces complex mechanical or chemical compatibility testing methods with an optical measurement system. By using light transmission measurements to detect inflection points during non-solvent addition, the method substitutes traditional time-consuming rheological or chemical analysis with faster optical detection. This substitution maintains manufacturing efficiency while providing reliable stability assessment to ensure long-term product durability.
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 approach enables reliable determination of bitumen stability, preventing asphaltene precipitation and improving the longevity and performance of road paving materials by ensuring stable bitumen blends.
Implementation Method 1
transmitting near IR laser light through the mixed bitumen product stream sample
Implementation Method 2
transmitting near IR laser light through the mixed bitumen product stream sample, and determining that inflection point value
Data Source
AI summary
Bitumen may be prepared by obtaining an inflection point value for a mixed bitumen product stream sample, and modifying the mixed bitumen product stream when the inflection point value occurs at a ratio of less than about 2 mL of added non-solvent per 1 gram of the mixed bitumen product stream sample. The inflection point value may correlate to the stability of the mixed bitumen product stream based on the amount of added non-solvent. The mixed bitumen product stream may have or include at least two bitumen feed streams.