Infrared Emitter Asphalt Heating for Pavement Binding
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Solution Overview
Problem
Conventional methods for maintaining and repairing asphalt/concrete pavement are costly and inefficient, leading to a rapidly failing infrastructure, as they fail to extend the lifespan of pavements effectively due to issues like waterproofing loss, mechanical stress, and delamination.
Innovation Solution
An emitter system that uses radiation with a peak wavelength of 1,000 to 10,000 nm to heat the asphalt independently of the stone, creating a temperature differential that disintegrates stone gradations while keeping them fully coated with asphalt, thereby extending the pavement's lifespan and improving resistance to mechanical stress and waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional heating methods are used to heat asphalt and aggregate together, then the heating process is simple, but the asphalt and stone are heated uniformly without creating temperature differential, resulting in poor binding properties
Solution Approach 1:
The patent applies local quality by heating the asphalt locally using infrared emitters positioned close to the asphalt layer, while the aggregate remains at ambient or lower temperature. This creates a temperature differential between the asphalt coating and the stone aggregate, allowing the asphalt to become sufficiently fluid for coating without overheating the aggregate, thereby improving binding properties while maintaining a relatively simple heating system.
2Strength
If conventional heating methods heat asphalt and aggregate uniformly, then the heating process is simple, but the nesting of stone gradations is not disintegrated, resulting in reduced resistance to mechanical stress
Solution Approach 1:
The infrared heating system applies local quality by selectively heating the asphalt coating to a temperature sufficient to fluidize it and allow it to penetrate and disintegrate the nesting of stone gradations. The aggregate itself remains cooler, preventing excessive thermal stress while still achieving the desired breakdown of stone nesting through the action of the fluidized asphalt, thereby improving resistance to mechanical stress.
3Ease of manufacture
If recycled asphalt/concrete pavement is used as aggregate, then cost is reduced, but the material requires temperature treatment to achieve proper fluxing and coating
Solution Approach 1:
The patent replaces conventional thermal heating systems with infrared radiation emitters that directly heat the asphalt coating on recycled aggregate. This substitution allows for precise temperature control and rapid heating of only the asphalt binder, achieving proper fluxing and coating without the need for extensive heating of the entire recycled material mass, thereby maintaining cost effectiveness while meeting temperature treatment requirements.
4Duration of action of stationary object
If infrared radiation with peak wavelength of 1,000 to 10,000 nm is used to heat asphalt independently, then temperature differential is achieved improving binding and lifespan, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by selecting specific infrared radiation wavelengths (peak wavelength of 1,000 to 10,000 nm) that are optimally absorbed by asphalt materials. This wavelength selection enables efficient heating of the asphalt coating to achieve proper fluxing and binding properties, extending pavement lifespan. The emitter system complexity is managed by using standard infrared heating technology with controlled radiation parameters rather than more complex heating mechanisms.
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 system significantly extends the lifespan of asphalt/concrete pavements by enhancing binding properties, resistance to mechanical stress, and waterproofing, while reducing maintenance costs by using recycled asphalt/concrete pavement as a cost-effective aggregate.
Implementation Method 1
each emitter panel is configured to emit a peak wavelength of radiation of from 1,000 to 10,000 nm
Implementation Method 2
the asphalt coating on the stone surface, including pores, is elevated in temperature ahead of the stone medium
Implementation Method 3
conveying the recycled asphalt/concrete pavement at a speed sufficient to achieve a flux of the asphalt in the recycled asphalt/concrete pavement by absorption of the radiation emitted by the emitter panels
Data Source
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AI summary
An asphalt and aggregate mixture and methods for preparing and using same are provided which utilize solid phase auto regenerative cohesion and homogenization by liquid asphalt oligopolymerization technologies. The mixtures are suitable for use in installing asphalt/concrete pavement, repairing asphalt/concrete pavement, and providing overlays to existing asphalt/concrete pavement. The slurries can contain recycled asphalt/concrete pavement subject to treatment.