Polyester-Modified Asphalt Composition for Durable Aggregate Bonding
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Solution Overview
Problem
Asphalt pavements deteriorate over time, leading to the generation of microplastics and the need for frequent repairs, which generate additional abrasion dust.
Innovation Solution
An asphalt composition containing a polyester polycondensate of polyethylene terephthalate, an alcohol, and a carboxylic acid compound, with specific heat and viscosity values, is used to enhance bonding between aggregates, reducing microplastic generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional asphalt composition is used, then construction is easy and paving is quick, but bonding strength between aggregates deteriorates over time leading to microplastic generation
Solution Approach 1:
The patent changes the chemical composition parameters of the asphalt binder by incorporating polyester resin (1-20 parts by mass per 100 parts by mass of asphalt) with specific molecular weight and softening point characteristics. This parameter change in the binder composition enhances the bonding strength between aggregates while maintaining durability, resolving the contradiction between initial strength and long-term durability.
Solution Approach 2:
The patent creates a composite asphalt material by combining conventional asphalt with polyester resin to form a modified asphalt composition. This composite material exhibits improved bonding strength and durability compared to conventional asphalt alone, as the polyester resin forms a more resilient matrix that maintains aggregate bonding over time, thereby resolving the contradiction between strength and durability.
2Reliability
If asphalt pavement is used, then good hardness and durability are achieved, but microplastics are generated through abrasion and deterioration
Solution Approach 1:
The patent converts the harmful effect of asphalt deterioration into a beneficial outcome by using polyester resin-modified asphalt that deteriorates more gracefully. The polyester component reduces the generation of microplastics during abrasion and deterioration while maintaining the durability benefits, effectively converting the harm of material degradation into a benefit of reduced microplastic pollution.
Solution Approach 2:
By changing the chemical parameters of the asphalt binder through polyester resin addition, the patent modifies the deterioration mechanism of the pavement. The modified composition maintains durability while reducing microplastic generation during wear, as the polyester resin creates a more stable matrix that degrades into larger, less harmful particles rather than fine microplastics.
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 composition improves bonding strength, thereby reducing microplastic generation and enhancing the durability of asphalt pavements.
Implementation Method 1
an asphalt composition containing an asphalt and a polyester... enhance bonding between aggregates
Data Source
AI summary
The present invention provides an asphalt composition containing an asphalt and a polyester, the polyester being a polycondensate of a polyethylene terephthalate, an alcohol, and a carboxylic acid compound, the polyethylene terephthalate having a value of [(a quantity of heat absorbed in a DSC measurement)−(a quantity of heat generated in a DSC measurement)] of 5 J/g or more and 30 J/g or less and having an intrinsic viscosity (IV) of 0.6 or more and 1.05 or less.