Asphalt Binder Viscosity Control via Epoxidized Fatty Acid Esters
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Solution Overview
Problem
Asphalt pavements face issues with oxidative aging, leading to brittleness and eventual cracking, due to environmental factors and high production costs of bio-based chemical products, which limits their adoption in warm mix asphalt technologies.
Innovation Solution
The use of epoxidized fatty acid esters as additives in asphalt production, which reduce mixing and compaction temperatures, improve low-temperature binder performance, and enhance the longevity and performance of asphalt pavements by mixing with asphalt at lower temperatures and incorporating mineral aggregates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high temperatures are used for asphalt mixing and compaction, then the asphalt binder viscosity is reduced and workability is improved, but oxidative aging accelerates leading to brittleness and cracking
Solution Approach 1:
The patent applies preliminary action by adding antioxidants to the asphalt binder before mixing and compaction operations. This pre-treatment ensures that the antioxidant is already present in the binder to counteract oxidative aging that occurs during high-temperature processing and throughout the pavement service life, thereby maintaining both workability and long-term durability
Solution Approach 2:
The patent converts the harmful effect of high temperature (which causes oxidative aging) into a benefit by using antioxidants that actually require the thermal energy present during mixing to become activated and effective. The heat that would normally accelerate degradation is instead utilized to enhance the antioxidant's protective function
2Reliability
If bio-based chemical products are used as warm mix asphalt additives, then environmental friendliness and performance are improved, but production costs increase
Solution Approach 1:
The patent employs cheap short-living objects by using cost-effective antioxidants that can be added in small quantities to provide sufficient protection during the critical mixing and compaction phases. These antioxidants are designed to be economical additives that deliver maximum benefit at minimal dosage, reducing the overall production cost compared to expensive bio-based alternatives
Solution Approach 2:
The patent applies parameter changes by optimizing the chemical composition and molecular structure of the antioxidant to achieve maximum protective effect at the lowest possible concentration. By adjusting parameters such as antioxidant type, dosage rate, and timing of addition, the patent achieves cost-effective performance enhancement without requiring expensive bio-based materials
3Duration of action of stationary object
If antioxidants are added to asphalt binder, then oxidative aging is delayed and pavement longevity is extended, but the complexity of the production process increases
Solution Approach 1:
The patent merges the antioxidant addition step with the existing asphalt binder preparation process. Rather than creating a separate, complex production line, the antioxidant is incorporated into the binder mixing operation that already exists in asphalt plants, thereby extending pavement longevity without significantly increasing production process complexity
Solution Approach 2:
The patent applies universality by using antioxidants that serve multiple functions: they protect against oxidative aging during mixing, compaction, and long-term service; they maintain binder workability at elevated temperatures; and they prevent both short-term and long-term deterioration. This multi-functionality reduces the need for multiple separate additives and simplifies the overall production process
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 reduces emissions, lowers production costs, extends the paving season, and improves the durability and performance of asphalt pavements by reducing asphalt binder viscosity and increasing the incorporation of recycled materials, while being environmentally friendly.
Implementation Method 1
reduces asphalt binder viscosity
Implementation Method 2
The oxidation of asphalt binder caused by chemical reactions causes transformations in the asphalt components
Data Source
AI summary
The present invention relates to a method of producing an improved asphalt. The method involves providing an asphalt and providing a compound of formula (I), as described herein. The asphalt is mixed with the compound of formula (I) under conditions effective to produce an improved asphalt. Also disclosed are an asphalt product and a method of making asphalt material. The invention further discloses a method of producing an improved asphalt comprising providing a polymer modified asphalt and providing a compound of formula (IIa) or formula (II). The polymer modified asphalt is mixed with the compound of formula (IIa) or formula (IIb) under conditions effective to produce an improved asphalt, which is yet another aspect of the present invention.