Self-Heating Cold Recycled Asphalt Pavement
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Solution Overview
Problem
The existing cold mix asphalt pavement systems face limitations in curing time and environmental impact, which hinders their widespread adoption and efficient utilization compared to traditional hot mix asphalt methods.
Innovation Solution
An electrically conductive pavement system is developed by incorporating carbon black material into a cold recycled asphalt mixture, which can be heated using an energy source, such as an electrical power source or magnetic field, to accelerate curing and enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cold mix asphalt is used, then environmental impact is reduced and energy consumption is lower, but curing time increases and mechanical characteristics develop slowly
Solution Approach 1:
The patent changes the temperature parameter of the asphalt mixture by incorporating heating elements that can heat the cold mix asphalt in-situ. This allows the material to temporarily reach temperatures that accelerate curing and mechanical property development, then return to cold operation for environmental benefits. The heating capability enables parameter transformation that resolves the contradiction between cold operation (low environmental impact) and fast curing (short time).
Solution Approach 2:
The patent introduces dynamic temperature control through heating elements embedded in or applied to the cold mix asphalt. The system can dynamically adjust temperature based on curing requirements, transitioning from cold state during mixing/placement to heated state during curing, then back to cold state for service. This dynamic approach allows the system to achieve fast curing when needed while maintaining low environmental impact during operation.
2Use of energy by moving object
If cold mix asphalt is used, then energy consumption is reduced, but mechanical strength and durability are compromised
Solution Approach 1:
The patent applies temperature parameter changes through integrated heating elements that can raise the temperature of cold mix asphalt during curing. This temporary thermal input accelerates binder recovery and mechanical property development without requiring sustained high-energy heating. The system achieves high strength development during curing while maintaining low overall energy consumption by limiting heating to specific time windows.
Solution Approach 2:
The patent incorporates heating elements into the cold mix asphalt during production or placement, preparing the material with embedded thermal capability before it is needed. This preliminary action enables rapid strength development when environmental conditions are unfavorable or when fast curing is required, while the heating elements remain dormant during normal operation, preserving low energy consumption characteristics.
3Loss of time
If traditional hot mix asphalt is used, then mechanical characteristics are achieved quickly, but environmental impact increases and energy consumption rises
Solution Approach 1:
The patent enables cold mix asphalt to achieve hot-mix-like curing characteristics by incorporating heating elements that can temporarily raise material temperature. This allows the cold mix to undergo accelerated curing similar to hot mix asphalt, achieving fast mechanical property development without the continuous high-temperature processing that causes environmental harm. The selective heating approach captures the speed advantage of hot mix while eliminating its environmental drawbacks.
Solution Approach 2:
The patent makes the cold mix asphalt self-heating capable through embedded heating elements or conductive additives that enable the material to generate or retain heat for curing purposes. This self-service heating capability allows the material to achieve fast curing independently of external hot mix plants, eliminating the need for continuous high-temperature production and transportation that cause environmental impact while maintaining quick strength development.
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 allows for faster curing and improved mechanical performance, reducing construction time and environmental impact while extending pavement service life and enabling self-healing capabilities.
Implementation Method 1
The heating element may couple the energy source to the pavement system. In a specific example, the energy source may include an electrical power source and/or a magnetic field. In a more specific example, the heating element may be directly coupled to an electrically conductive cable or wire
Implementation Method 2
The electrically conductive pavement system includes a cold recycled asphalt mixture and a carbon black material. The carbon black material is mixed with the cold recycled asphalt mixture.
Implementation Method 3
the energy source may include an electrical power source and/or a magnetic field. In a more specific example, the heating element may be directly coupled to an electrically conductive cable or wire or may be coupled indirectly through a magnetic field
Data Source
AI summary
The electrically conductive pavement system includes a cold recycled asphalt mixture and a carbon black material. The carbon black material is mixed with the cold recycled asphalt mixture. The pavement system is configured to be heated. For instance, the pavement system includes a heating element and an electrical power source. The heating element may couple the electrical power source to the pavement system. In a more specific example, the heating element may include an electrical probe that include an electrically conductive cable or wire. The electrically conductive cable or wire may be selectively heated when the electrical power source is engaged. Once heated, the pavement system may have faster curing times and enhanced compaction over known pavements. The heating functionality also permits self-healing capabilities for more efficient repairs and enhanced durability. The heating functionality may also be utilized to melt ice and/or snow from a surface of the pavement system.