Anti-Aging Additives for Bitumen Aging Delay
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Solution Overview
Problem
Bitumen aging leads to reduced mechanical performance and lifespan of road surfaces, particularly due to increased asphaltene content, which results in cracking and loss of sealing integrity, necessitating the development of additives to delay aging and improve longevity.
Innovation Solution
The use of specific anti-aging additives, such as compounds of formula (1) and (2), in concentrations between 0.01% and 10% by weight, which include alkylene oxide-based polymers and amidoamine derivatives, are added to bitumen to slow down degradation and extend its lifespan, both in new and recycled bituminous materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bitumen is used in road construction without additives, then initial mechanical performance is achieved, but aging occurs leading to cracking and loss of sealing integrity over time
Solution Approach 1:
The patent applies preliminary action by adding anti-aging additives to bitumen before it is used in road construction. These additives prevent aging-related degradation from occurring in the first place, rather than treating it after cracking appears. The additives are incorporated into the bitumen mix during production, ensuring protective action is already in place before the road is laid, thereby extending lifespan while maintaining sealing integrity.
2Ease of repair
If bitumen is heated for recycling, then degraded bituminous material can be returned to appropriate form, but additional degradation occurs during heating
Solution Approach 1:
The patent applies beforehand cushioning by incorporating anti-aging additives that provide protective action before thermal degradation can occur during recycling. These additives cushion against the harmful effects of high-temperature heating, preventing additional degradation that would normally occur during the recycling process. This allows bitumen to be recycled multiple times while maintaining mechanical performance and reliability.
3Strength
If asphaltene content increases due to aging, then bitumen hardens, but this leads to cracking and degraded properties
Solution Approach 1:
The patent applies blessing in disguise by using anti-aging additives that interfere with the aging process itself. Instead of accepting increased asphaltene content as an inevitable consequence leading to cracking, the additives prevent the chemical reactions that cause asphaltene precipitation and aggregation. This converts the potential harm of aging into a benefit by maintaining the original balanced composition, thereby preserving both appropriate hardness and crack resistance simultaneously.
Data Source
AI summary
The invention relates to the use of an additive chosen from the compounds of formula (1) and the compounds of formula (2) as follows: in which A, B, E, Y, Z and d and j are as defined in the description, the anti-ageing additive being present in an amount of between 0.01% and 10% by weight, relative to the total weight of the bituminous product, in order to delay the ageing of the bitumen. The invention also relates to a composition comprising:—a bituminous product,—at least one anti-ageing additive as described above, and—at least one anti-oxidant agent, the anti-ageing additive being present in an amount of between 0.01% and 10% by weight, relative to the total weight of the bituminous product.