5% Polyester-Modified Bitumen for Low-Temperature Flexibility
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Solution Overview
Problem
Bituminous pavements in regions with high temperature differences and low winter temperatures face issues such as cracking, deterioration, and shortened service life due to the inability of pure bitumen to maintain flexibility at lower temperatures.
Innovation Solution
Modification of bitumen with 5% isophthalic acid-based isophthalic unsaturated polyester resin to enhance its flexibility and durability, allowing it to maintain a flexible structure at temperatures approximately 10°C lower than pure bitumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure bitumen is used as binder in road pavements, then the material is simple and cost-effective, but it loses flexibility and becomes brittle at low temperatures, causing cracking and deterioration
Solution Approach 1:
The patent applies composite materials by combining bitumen with polyester resin (specifically isophthalic acid-based isophthalic unsaturated polyester resin) to create a modified bitumen compound. This composite material maintains the flexibility benefits of bitumen while adding the low-temperature resistance properties of polyester resin, resolving the contradiction between reliability at low temperatures and material simplicity.
Solution Approach 2:
The patent changes the chemical composition parameters of bitumen by adding 5% polyester resin by weight. This parameter change modifies the glass transition temperature and brittleness point of the bitumen, enabling it to maintain flexibility at approximately 10°C lower temperatures than pure bitumen, thus improving reliability without excessive complexity.
2Duration of action of stationary object
If bitumen is used alone, then the pavement structure is simple, but the service life is shortened due to cracking and deterioration in cold regions
Solution Approach 1:
By creating a composite binder system of bitumen and polyester resin, the patent extends the service life of pavements in cold regions. The polyester resin component prevents brittle cracking at low temperatures, directly addressing the durability issue while maintaining reasonable compositional complexity through a straightforward 5% addition ratio.
Solution Approach 2:
The patent modifies the thermal and mechanical parameters of the bitumen binder through chemical composition adjustment. The addition of polyester resin changes the glass transition temperature and elasticity modulus, enabling the pavement to withstand temperature cycling without cracking, thus extending service life.
3Ease of manufacture
If pure bitumen is used, then maintenance costs are low initially, but frequent renewal is required due to deterioration from temperature variations
Solution Approach 1:
The patent uses composite materials to achieve a balance between initial cost and long-term reliability. The 5% polyester resin addition is relatively small in cost but provides significant improvement in resistance to temperature-induced cracking, reducing the frequency of pavement renewal and associated maintenance costs over time.
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 modified bitumen maintains its flexible structure at lower temperatures, increasing its durability and suitability for use in regions with significant temperature variations, thereby extending the service life and reducing maintenance costs.
Implementation Method 1
determination that bitumen modified with 5% Polyester Resin can still maintain its flexible structure at temperatures approximately 10° C. lower compared to pure bitumen
Data Source
AI summary
A determination of dielectric loss, glass transition temperature, and brittleness of modified bitumen is provided. Bitumen modified with 5% polyester resin can still maintain its flexible structure at temperatures approximately 10° C. lower compared to pure bitumen and this modified bitumen can be used in regions where temperature differences are high.