Naphthenic Acid Esters in Asphalt Binders
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Solution Overview
Problem
There is a need for novel rheology modifiers to enhance the viscoelastic properties of asphalt binder compositions, particularly to improve low-temperature performance and facilitate the reclamation and integration of aged bitumen from recycled asphalt materials into new asphalt mixes, reducing reliance on virgin, non-renewable materials.
Innovation Solution
The use of naphthenic esters, such as naphthenic polyol esters, as rheology modifiers in bituminous binder compositions to improve the low-temperature performance and rejuvenate aged binders, allowing for the effective incorporation of recycled asphalt materials into new asphalt mixes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional asphalt binders are used, then high-temperature performance is maintained, but low-temperature cracking resistance is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the asphalt binder by incorporating naphthenic acid esters with specific molecular structures and ratios. This changes the physical properties of the binder to improve low-temperature flexibility while maintaining high-temperature stability through controlled composition adjustments.
Solution Approach 2:
The patent creates a composite asphalt binder system by combining conventional bitumen with naphthenic acid esters and other additives. This composite approach leverages the complementary properties of each component to achieve both low-temperature cracking resistance and high-temperature performance stability.
2Reliability
If virgin asphalt materials are used, then new pavement performance is optimized, but reliance on non-renewable resources increases
Solution Approach 1:
The patent enables the recovery and reuse of aged bitumen from recycled asphalt materials through the use of naphthenic acid esters as rejuvenators. This process restores the functional properties of aged binder, allowing it to be incorporated into new asphalt mixes and reducing the need for virgin materials.
Solution Approach 2:
The patent changes the chemical and physical parameters of aged bitumen through treatment with naphthenic acid esters, transforming it from a degraded state to a functional state suitable for reuse in new pavement constructions.
3Loss of substance
If aged bitumen is recycled, then material sustainability is improved, but integration into new asphalt mixes is difficult
Solution Approach 1:
The patent adjusts the rheological and chemical parameters of aged bitumen through naphthenic acid ester treatment, making it more compatible with new asphalt components and facilitating seamless integration into fresh asphalt mixes.
Solution Approach 2:
The naphthenic acid esters act as intermediary agents that bridge the compositional gap between aged and virgin bitumen, enabling effective integration and uniform distribution within the new asphalt mixture.
Data Source
AI summary
Asphalt binders and bituminous compositions comprising additives such as naphthenic acid esters. In certain embodiments the ester compounds may be useful as rheology modifiers for use in bituminous binders in road paving applications.