Sulfur-Extended Asphalt Binder Temperature Control
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Solution Overview
Problem
High temperatures during the processing of asphalt materials lead to the formation of toxic hydrogen sulfide and sulfur dioxide gases, posing health risks to workers and environmental hazards, while elemental sulfur, a potential waste product, lacks effective commercial applications.
Innovation Solution
Development of a Performance Grade sulfur-extended asphalt binder and emulsion that incorporates free sulfur, a linear alkane material, and base asphalt, maintaining temperatures below 275°F to prevent harmful gas formation and utilizing a significant amount of elemental sulfur, thereby enhancing safety and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If asphalt processing temperatures are increased to improve workability and bonding, then the bonding performance is improved, but toxic hydrogen sulfide and sulfur dioxide gases are formed posing health and environmental risks
Solution Approach 1:
The patent changes the temperature parameter from traditional high temperatures (>300°F) to reduced temperatures (below 275°F), fundamentally altering the processing conditions to prevent harmful gas formation while maintaining adequate bonding performance through optimized binder composition
Solution Approach 2:
The patent creates a composite asphalt binder system combining base asphalt with sulfur-modified components and linear alkane materials, where the synergistic interaction of these materials enables effective bonding at lower temperatures without generating toxic gases
2Adaptability or versatility
If elemental sulfur is incorporated into asphalt binders to create commercial value from waste product, then the economic value is improved, but the sulfur content is limited to small percentages
Solution Approach 1:
The patent changes the sulfur content parameter from trace amounts ( <1%) to significant concentrations (10-50% by weight), transforming the approach to sulfur incorporation and enabling both economic value creation and effective bonding performance
Solution Approach 2:
The patent converts waste elemental sulfur into a beneficial binding agent by incorporating it at high concentrations into the asphalt binder system, where it serves dual purposes: creating commercial value from waste and contributing to bonding performance at reduced processing temperatures
3Quantity of substance
If sulfur reactions are allowed to proceed at high temperatures to utilize sulfur content, then the sulfur utilization is improved, but hydrogen sulfide gas is formed which is toxic to humans
Solution Approach 1:
The patent changes the temperature parameter to below 275°F, which is sufficient to activate sulfur-modified asphalt binder components and achieve effective bonding while preventing the thermal decomposition that produces toxic hydrogen sulfide gas
Solution Approach 2:
The patent introduces linear alkane materials as intermediary substances that facilitate sulfur incorporation and bonding at lower temperatures, acting as mediators between the sulfur-modified asphalt binder and the aggregate or pavement structure
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 solution allows for safer and more environmentally friendly processing and application of asphalt materials, utilizing waste sulfur effectively and reducing energy consumption, while meeting and exceeding AASHTO Performance Graded Asphalt Binder specifications for improved physical and chemical properties.
Implementation Method 1
maintaining temperatures below 275°F to prevent harmful gas formation
Implementation Method 2
A Performance Grade sulfur-extended asphalt binder emulsion includes a viscosifier in a range of from about 0.1% to about 3%, an emulsifier in a range of from about 0.1% to about 5%
Data Source
AI summary
A Performance Grade sulfur-extended asphalt binder emulsion is made by combining a viscosifier, an emulsifier, a Performance Grade sulfur-extended asphalt binder, optionally a saponification agent, and a base aqueous solution. During creation of the asphalt emulsion, none of the components or combinations of them exceeds 275° F. The Performance Grade sulfur-extended asphalt binder composition is made by combining free or element sulfur, a linear alkane material, optionally a saturated-backbone polymer modifier, optionally a non-aqueous acid, and a base asphalt. The disclosed Performance Graded sulfur-extended asphalt binder and Performance Graded asphalt sulfur-extended asphalt binder emulsion allow operators using these products directly or in combination with aggregates and other materials to mix and blend the compositions, and apply the compositions in the field, at temperatures less than 300° F.