Asphalt Paving Material Layer with Polyester Stress Relaxation
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Solution Overview
Problem
Conventional asphalt pavement methods fail to provide stability and stress relaxation simultaneously, leading to damage under high loads and increased maintenance costs due to cracking.
Innovation Solution
A road paving method involving a mixture of asphalt, thermoplastic elastomer, and polyester, where the polyester has a softening point of 90°C to 140°C and a glass transition point of 40°C to 80°C, with a ratio of 17 to 50 parts by mass based on 100 parts of asphalt, to enhance intermolecular interactions and absorption on aggregates, improving stability and stress relaxation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional asphalt pavement is used, then construction is easy and traffic start is quick, but cracks and ruts are generated due to long-term use
Solution Approach 1:
The patent applies composite materials by combining asphalt with a polyester resin having specific properties (softening point 90-140°C, glass transition point 40-80°C) and controlled molecular weight. This composite asphalt-polyester mixture provides both the ease of construction of conventional asphalt and enhanced durability, crack resistance, and stress relaxation properties that prevent crack formation under long-term use.
2Strength
If asphalt pavement is used, then good hardness and durability are achieved, but stress relaxation is insufficient leading to crack formation
Solution Approach 1:
The patent applies parameter changes by carefully controlling the softening point (90-140°C) and glass transition point (40-80°C) of the polyester resin, as well as its molecular weight (100-1000). These parameter adjustments enable the asphalt-polyester composite to maintain adequate hardness while significantly improving stress relaxation capabilities, preventing crack formation under repeated loading.
3Reliability
If polyester with specific properties is added to asphalt, then stability and stress relaxation are improved, but mixture complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for the polyester resin properties (softening point 90-140°C, glass transition point 40-80°C, molecular weight 100-1000) and their optimal ratios in the asphalt mixture. These controlled parameter adjustments improve pavement stability and stress relaxation while maintaining manageable mixture composition complexity through defined specifications.
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 method results in an asphalt paving material layer that maintains stability and flexibility, reducing the formation of cracks and enhancing durability under high loads and high temperatures.
Implementation Method 1
the polyester has a softening point of 90° C. or higher and 140° C. or lower and a glass transition point of 40° C. or higher and 80° C. or lower
Implementation Method 2
enhancing intermolecular interactions and absorption on aggregates
Data Source
AI summary
The present invention relates to a road paving method enabling one to provide an asphalt paving material layer in which both excellent stability and stress relaxation can be made compatible with each other, the method includingStep 1: a step of mixing asphalt, a thermoplastic elastomer, a polyester, and an aggregate to obtain an asphalt mixture, andStep 2: a step of laying the asphalt mixture obtained in Step 1 on a road, thereby forming an asphalt paving material layer, whereinthe polyester has a softening point of 90° C. or higher and 140° C. or lower and a glass transition point of 40° C. or higher and 80° C. or lower, anda ratio of the polyester is more than 17 parts by mass and 50 parts by mass or less based on 100 parts by mass of the asphalt.