Rejuvenated Asphalt Mixture Using Polymer Metal Salt Dispersion
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Solution Overview
Problem
Asphalt-regenerated aggregates used in pavement construction suffer from deteriorated properties due to thermal and ultraviolet degradation, leading to reduced durability and flexibility, and existing methods require curing with additives, which can affect performance.
Innovation Solution
An asphalt mixture containing new asphalt, a polymer metal salt derived from an aromatic monomer with an acidic group, and asphalt-regenerated aggregate, which enhances dispersibility and improves durability and flexibility through n-n interaction and ionized acid anion repulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asphalt-regenerated aggregate is used to reduce material cost and environmental impact, then sustainability and cost-effectiveness are improved, but durability and flexibility deteriorate due to thermal and ultraviolet degradation
Solution Approach 1:
A polymer metal salt is introduced as an intermediary substance between the degraded asphalt binder and the aggregate. This polymer metal salt contains aromatic structural units that interact with asphaltene through n-n interactions, and its metal salt component provides ionized acid anion groups that create repulsion forces. This intermediary compound rejuvenates the degraded asphalt, restoring its durability and flexibility without requiring complete replacement of the regenerated aggregate.
Solution Approach 2:
The chemical and physical parameters of the degraded asphalt binder are modified by adding the polymer metal salt. The polymer metal salt changes the molecular structure and interaction forces within the asphalt matrix, transforming the degraded state into a rejuvenated state with improved durability and flexibility. This parameter change approach allows the use of asphalt-regenerated aggregate while overcoming its inherent degradation issues.
2Reliability
If polymer metal salt with aromatic monomer and acidic group is added to rejuvenate degraded asphalt, then durability and flexibility are improved, but mixture complexity increases
Solution Approach 1:
The polymer metal salt serves multiple functions simultaneously: it acts as a dispersant for asphaltene, a rejuvenator for degraded asphalt, and a bonding agent between aggregate and asphalt binder. By combining these functions into a single compound with specific molecular structure (aromatic monomer units with acidic groups), the invention reduces the need for multiple separate additives, thereby simplifying the overall mixture composition while maintaining improved pavement properties.
3Stability of the object's composition
If asphaltene dispersibility is enhanced through n-n interaction and ion repulsion, then mixture homogeneity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The polymer metal salt is designed with specific molecular parameters including aromatic structural units for n-n interactions and metal salt components providing ionized acid anion groups. These parameter choices create strong intermolecular forces that enhance asphaltene dispersibility. The specific chemical structure and dosage recommendations provide clear manufacturing guidelines, balancing the need for homogeneity with practical manufacturing precision requirements.
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
The asphalt mixture provides superior pavement properties, such as increased durability and flexibility, by adsorbing asphaltene in degraded asphalt, thereby improving the performance of asphalt pavements.
Implementation Method 1
The polymer metal salt (P) has a structural unit derived from an aromatic monomer and has an acidic group, and the asphalt mixture has superior pavement properties, such as durability and flexibility, due to adsorption of asphaltene in the degraded asphalt and dispersibility of the polymer metal salt (P)
Implementation Method 2
the asphalt mixture has superior pavement properties, such as durability and flexibility, due to adsorption of asphaltene in the degraded asphalt and dispersibility of the polymer metal salt (P)
Data Source
AI summary
The present invention relates to an asphalt mixture containing a new asphalt, the following polymer metal salt (P), and an asphalt-regenerated aggregate. The polymer metal salt (P) is a metal salt of a polymer having a structural unit derived from an aromatic monomer and having an acidic group.