Fused Ring Asphalt Additives for Aging Resistance
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Solution Overview
Problem
Current additives for retarding the aging of asphalt binders, such as plant sterols, do not fully address the environmental safety and efficacy in maintaining the properties of asphalt binders over time, particularly in high and low temperature applications.
Innovation Solution
Development of additives with a fused hydrocarbon ring structure, a polar element attached to the ring, and an aliphatic element, which are environmentally safe and do not degrade during the aging process, improving the aging resistance of asphalt binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plant sterol additives are used to retard aging of asphalt binders, then aging resistance is improved, but environmental safety and efficacy in maintaining properties over time are not fully addressed
Solution Approach 1:
The patent modifies the molecular structure of sterol additives by changing parameters such as the fused ring structure configuration, position of polar elements, and aliphatic chain length to optimize both aging resistance and environmental safety. Specifically, the invention uses saturated fused ring structures without aromatic rings to eliminate carcinogenic properties while maintaining the age-retarding effectiveness through carefully selected molecular weight ranges (250-650 g/mol) and melting points (150-500°F).
Solution Approach 2:
The patent creates composite molecular structures combining specific fused ring systems (such as gonane, steroid, or triterpenoid cores) with polar functional groups (hydroxyl, carboxyl, or amine) and aliphatic side chains. This composite approach allows the additive to simultaneously achieve multiple functions: retarding asphalt binder aging through the rigid fused ring structure that maintains molecular spacing, while the polar groups provide environmental safety by eliminating toxic aromatic rings and ensuring biodegradability.
2Reliability
If conventional additives are used, then some aging retarding effect is achieved, but they degrade during the aging process and do not maintain asphalt binder properties
Solution Approach 1:
The patent incorporates stabilizing features into the additive's molecular structure before the asphalt binder undergoes aging. The saturated fused ring structures and stable polar functional groups are pre-configured to resist oxidation and degradation during the aging process, allowing the additive to maintain its age-retarding function throughout the service life of the asphalt binder without degrading itself.
Solution Approach 2:
The rigid fused ring structure of the additive acts as a structural cushion that maintains molecular spacing in the asphalt binder even as the binder undergoes aging. This pre-positioned structural support compensates for the hardening and brittleness that develop during aging, allowing the additive to continuously protect the binder's flexibility and performance properties throughout its service life.
Data Source
AI summary
This disclosure describes further age retarding additives for asphalt binders. These additives comprise three structural elements i) a fused hydrocarbon ring structure, ii) a polar element attached to the ring structure, and iii) an aliphatic element attached to the ring structure opposite the polar element.