Salt-Mediated Asphalt Mixture for Regenerated Aggregate Durability
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Solution Overview
Problem
Asphalt pavements using regenerated aggregates suffer from deteriorated properties due to thermal degradation and ultraviolet exposure, leading to reduced durability and flexibility, and existing methods do not effectively address these issues.
Innovation Solution
An asphalt mixture containing new asphalt, a salt of an inorganic acid-derived anion and a metal cation, or its hydrate, and asphalt-regenerated aggregate is used, with the salt enhancing dispersibility through cation-π interaction to revive the asphalt's binder function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If asphalt-regenerated aggregate is used to reduce cost and promote sustainability, then material cost and environmental impact are improved, but pavement durability and flexibility deteriorate due to thermal degradation and ultraviolet exposure
Solution Approach 1:
The patent introduces a salt of inorganic acid-derived anion and metal cation as an intermediary substance that mediates between the degraded asphalt in regenerated aggregate and the new asphalt binder. This intermediary salt restores the binder function by enhancing dispersibility through cation-π interaction, thereby improving pavement durability without compromising the benefits of using regenerated aggregate
Solution Approach 2:
The patent changes the chemical parameters of the asphalt mixture by adding specific salts (e.g., calcium sulfate, barium sulfate, strontium sulfate, lead sulfate, zinc sulfate, copper sulfate, aluminum sulfate, iron sulfate, magnesium sulfate, sodium sulfate, potassium sulfate, ammonium sulfate, calcium nitrate, barium nitrate, strontium nitrate, lead nitrate, zinc nitrate, copper nitrate, aluminum nitrate, iron nitrate, magnesium nitrate, sodium nitrate, potassium nitrate, ammonium nitrate, calcium chloride, barium chloride, strontium chloride, lead chloride, zinc chloride, copper chloride, aluminum chloride, iron chloride, magnesium chloride, sodium chloride, potassium chloride, ammonium chloride, calcium acetate, barium acetate, strontium acetate, lead acetate, zinc acetate, copper acetate, aluminum acetate, iron acetate, magnesium acetate, sodium acetate, potassium acetate, ammonium acetate, calcium formate, barium formate, strontium formate, lead formate, zinc formate, copper formate, aluminum formate, iron formate, magnesium formate, sodium formate, potassium formate, ammonium formate, calcium oxalate, barium oxalate, strontium oxalate, lead oxalate, zinc oxalate, copper oxalate, aluminum oxalate, iron oxalate, magnesium oxalate, sodium oxalate, potassium oxalate, ammonium oxalate, calcium carbonate, barium carbonate, strontium carbonate, lead carbonate, zinc carbonate, copper carbonate, aluminum carbonate, iron carbonate, magnesium carbonate, sodium carbonate, potassium carbonate, ammonium carbonate, calcium phosphate, barium phosphate, strontium phosphate, lead phosphate, zinc phosphate, copper phosphate, aluminum phosphate, iron phosphate, magnesium phosphate, sodium phosphate, potassium phosphate, ammonium phosphate, calcium silicate, barium silicate, strontium silicate, lead silicate, zinc silicate, copper silicate, aluminum silicate, iron silicate, magnesium silicate, sodium silicate, potassium silicate, ammonium silicate, calcium fluoride, barium fluoride, strontium fluoride, lead fluoride, zinc fluoride, copper fluoride, aluminum fluoride, iron fluoride, magnesium fluoride, sodium fluoride, potassium fluoride, ammonium fluoride, calcium hydroxide, barium hydroxide, strontium hydroxide, lead hydroxide, zinc hydroxide, copper hydroxide, aluminum hydroxide, iron hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, ammonium hydroxide, calcium oxide, barium oxide, strontium oxide, lead oxide, zinc oxide, copper oxide, aluminum oxide, iron oxide, magnesium oxide, sodium oxide, potassium oxide, ammonium oxide, calcium peroxide, barium peroxide, strontium peroxide, lead peroxide, zinc peroxide, copper peroxide, aluminum peroxide, iron peroxide, magnesium peroxide, sodium peroxide, potassium peroxide, ammonium peroxide). These parameter changes restore the binder function and improve pavement performance
2Reliability
If new asphalt is used to ensure good pavement properties, then durability and flexibility are improved, but material cost increases
Solution Approach 1:
The patent recovers and reuses degraded asphalt binder from old pavement through regeneration processes to create asphalt-regenerated aggregate. Instead of discarding this recovered binder, it is incorporated into new pavement mixtures with the help of restoring salts, thereby reducing the need for new expensive asphalt binder while maintaining pavement quality
Solution Approach 2:
The patent creates a composite asphalt mixture combining new asphalt, regenerated aggregate containing recovered binder, and inorganic salt additives. This composite material leverages the cost-effectiveness of regenerated materials while using the salt additive to restore binder function, achieving both economic and performance goals
3Reliability
If salt of inorganic acid-derived anion and metal cation is added to enhance dispersibility and binder function, then pavement flexibility and durability are improved, but mixture complexity increases
Solution Approach 1:
The patent uses small amounts of inorganic salt additives (typically 0.1-10% by mass of total mixture) that act as temporary mediators during the mixing process. These salts are inexpensive compared to the value of the asphalt binder they restore, and their role is limited to enhancing dispersibility and binder function during construction, after which they become part of the permanent pavement structure
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 pavements with superior durability and flexibility, as evidenced by improved Marshall stability and crack resistance.
Implementation Method 1
a salt composed of a strong acid-derived anion and a metal cation or a salt hydrate composed of an inorganic acid-derived anion and a metal cation, wherein the salt enhances dispersibility through cation-π interaction to revive the asphalt's binder function
Data Source
AI summary
The present invention relates to an asphalt mixture containing a new asphalt, a salt of an inorganic acid-derived anion and a metal cation or a hydrate thereof, and an asphalt-regenerated aggregate.