Polyester-Modified Asphalt Composition for Rutting and Storage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing asphalt compositions face challenges in simultaneously achieving high storage stability and suppressing rutting of paved surfaces, with previous technologies either failing to address both issues effectively.
Innovation Solution
An asphalt composition is developed containing a polyester derived from polyethylene terephthalate, an alcohol with an alkylene oxide adduct of bisphenol A, and a carboxylic acid compound, which undergoes polycondensation to form a finely dispersed and strongly interactive binder with asphaltene, enhancing both storage stability and rutting resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional asphalt compositions are used, then the pavement can be constructed easily and quickly, but the pavement develops ruts and cracks over time requiring frequent maintenance
Solution Approach 1:
The patent modifies the chemical composition parameters of the asphalt binder by incorporating specific polymers (SBS, SIS, SBR) and antioxidants (BHT, TBHQ) in optimized proportions. This changes the rheological properties and chemical stability of the asphalt, enabling it to resist rutting and cracking while maintaining workability during construction.
Solution Approach 2:
The invention creates a composite asphalt material by combining base asphalt with polymer modifiers and antioxidants. This composite structure integrates the adhesive properties of asphalt with the elastic recovery of polymers and the protective effects of antioxidants, achieving both durability and construction ease.
2Strength
If polyester resin is added to improve dry strength and water immersion strength, then the asphalt composition gains better mechanical properties, but the storage stability at high temperature deteriorates
Solution Approach 1:
The patent introduces antioxidants (BHT, TBHQ) as intermediary substances that mediate between the polyester resin and the asphalt base. These antioxidants prevent oxidative degradation of the polyester resin at high temperatures, thereby maintaining storage stability while preserving the strength-enhancing properties of the polyester.
Solution Approach 2:
The invention optimizes the molecular weight and structural parameters of the polyester resin, and controls its content within a specific range (5-50 parts per 100 parts asphalt). This parameter optimization ensures that the polyester provides sufficient strength improvement without causing excessive viscosity increase or storage instability.
3Strength
If polyester resin is added to suppress rutting, then the plastic flow resistance improves, but the storage stability at high temperature worsens
Solution Approach 1:
The antioxidants (BHT, TBHQ) act as intermediaries that protect the polyester resin from thermal oxidation during storage. This protection mechanism allows the polyester to maintain its rutting resistance properties without suffering from storage degradation, effectively decoupling these two previously conflicting properties.
Solution Approach 2:
The patent creates local quality differentiation by having the polyester resin concentrate in the asphaltene-rich phases where rutting resistance is needed, while the antioxidants distribute throughout the matrix to provide localized protection against oxidation. This spatial differentiation allows simultaneous optimization of both rutting resistance and storage stability.
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 achieves excellent storage stability and effectively suppresses rutting of paved surfaces by tightly binding asphalt and aggregate, improving the plastic flow resistance of the asphalt composition.
Implementation Method 1
the polyester being a polycondensate of a polyethylene terephthalate, an alcohol, and a carboxylic acid compound
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 alcohol containing an alkylene oxide adduct of bisphenol A.