Rubber Asphalt Using Hexanediol Crosslinking
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Solution Overview
Problem
Existing rubber asphalt technologies require a large amount of asphalt, result in high costs, and have complex processes with strict quality control, leading to reduced flowability and increased adhesiveness, making them uneconomical and environmentally polluting.
Innovation Solution
A rubber asphalt composition with a higher content of waste tire powder and hexanediol as a crosslinking agent, allowing for a reduced asphalt-aggregate ratio and improved flowability while maintaining adhesiveness, using a simplified wet mixing process that avoids desulfuration and melting steps, utilizing a ratio of 4-1 matrix asphalt to rubber modifier and 94-96 waste tire powder to hexanediol, and heating to 190-210°C to produce a more penetrable and cost-effective product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of rubber powder is increased to improve pavement performance, then the adhesiveness of rubber asphalt is increased, but the flowability is reduced and construction workability is reduced
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific crosslinking agents (metal salts, organic compounds, or their combinations) and controlling their content (0.1-5% of rubber powder mass). This chemical modification enables the rubber powder to achieve both high adhesiveness and acceptable flowability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite system by combining rubber powder with crosslinking agents and optional助agents in specific ratios. This composite approach allows the rubber-modified asphalt to simultaneously exhibit enhanced adhesiveness from rubber powder and maintained flowability through the chemical action of crosslinking agents, thus resolving the contradiction.
2Strength
If the content of rubber powder is increased to improve pavement performance, then the adhesiveness is improved, but the construction cost is increased due to high asphalt requirement
Solution Approach 1:
The patent modifies the chemical parameters of the rubber modification system by adding crosslinking agents that enable effective rubber-asphalt interaction at lower rubber powder contents (5-30% by weight). This chemical enhancement reduces the need for excessive asphalt to achieve adequate adhesiveness, thereby reducing overall material costs.
Solution Approach 2:
The patent employs inexpensive crosslinking agents (metal salts, organic compounds) that can be added in small quantities to achieve significant performance improvement. These low-cost additives replace the need for large amounts of expensive asphalt, thus reducing the quantity of substance required while maintaining adhesiveness.
3Strength
If the existing rubber asphalt process is used with strict quality control, then the adhesiveness is improved, but the process complexity is increased and environmental pollution is caused
Solution Approach 1:
The patent extracts and eliminates the complex desulfuration step from the traditional rubber modification process. By using crosslinking agents that work directly with raw or minimally processed rubber powder, the method removes the need for sulfur removal equipment and complex multi-stage processing, thereby reducing device complexity while maintaining adhesiveness.
Solution Approach 2:
The patent converts the traditionally harmful sulfur content in rubber powder from a nuisance requiring complex removal into a beneficial component. The crosslinking agents utilize the sulfur in rubber to form crosslinked structures that enhance adhesiveness, thus eliminating the need for desulfuration equipment and reducing process complexity while improving performance.
4Strength
If the existing rubber asphalt process is used with strict quality control, then the adhesiveness is improved, but the environmental pollution is increased
Solution Approach 1:
The patent transforms the environmentally problematic desulfuration process into a beneficial crosslinking process. By using crosslinking agents that react with rubber components in a controlled manner, the method eliminates the need for harsh desulfuration chemicals and high-temperature processing that cause pollution, while still achieving high adhesiveness.
Solution Approach 2:
The patent removes the polluting desulfuration step from the production process. By directly using rubber powder with crosslinking agents, the method eliminates the generation of harmful byproducts and reduces environmental pollution while maintaining the required adhesiveness performance.
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 increases the use quantity of rubber powder modifier, reduces asphalt usage, enhances penetrability, and balances adhesiveness and flowability, meeting industrial standards with improved pavement performance and reduced environmental impact.
Implementation Method 1
hexanediol as a crosslinking agent
Implementation Method 2
heating to 190-210°C to produce a more penetrable and cost-effective product
Data Source
AI summary
A rubber asphalt and a preparation method thereof are disclosed. The rubber asphalt comprises matrix asphalt and rubber powder modifier in a ratio of 4:1-4, wherein the rubber powder modifier comprises waste tire rubber powder and hexanediol in a ratio of 94-96:6-4. The method comprises the following steps: mixing the hexanediol with the waste tire rubber powder according to the ratio and stirring and wetting to obtain the rubber powder modifier; placing the matrix asphalt into a reaction kettle and heating to 90-170° C.; adding the rubber powder modifier into the reaction kettle according to the ratio; and raising the temperature to 190-210° C. under the stirring state to obtain the rubber asphalt. The rubber asphalt has an extensibility of 13-19 cm at 5° C., a penetration of 68-75 at 25° C. and a softening point of 53-90° C. The asphalt-aggregate ratio of a mixed material on the subsequent work section can be reduced to 6-8 from 8-10. The rubber asphalt can be used for producing a mixture for highway construction and preventing water and leakage of roofing and tunnel.