Induction Heated Asphalt Repair Composition
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Solution Overview
Problem
Conventional methods for repairing damaged runways require heating asphalt concrete, which is time-consuming and disrupts airfield operations, while cold compositions do not compact properly, leading to unsuitable temporary repairs for high-traffic areas.
Innovation Solution
A novel asphalt repair composition combining an asphalt binder, aggregate particles, and induction particles, where the induction particles are heated by an induction heater generating a magnetic field, allowing rapid heating of the composition to achieve compaction temperature without closing airfields for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used to heat asphalt repair composition, then the composition reaches compaction temperature, but the heating process takes several hours causing runway closure
Solution Approach 1:
The patent replaces conventional thermal conduction heating with electromagnetic induction heating. The induction heater generates a magnetic field that directly induces eddy currents in the conductive aggregate particles, converting electromagnetic energy directly into heat within the material itself rather than heating from the outside in. This substitution of heating mechanism reduces heating time from several hours to a fraction of that time.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the asphalt composition by incorporating conductive aggregate particles with specific properties (electrical conductivity, size distribution 0.075mm to 19mm, making up 10-50% of total aggregate). These parameter changes enable the material to interact with electromagnetic fields and generate heat internally through eddy currents, fundamentally changing the heating behavior from slow external conduction to rapid internal generation.
2Loss of time
If cold compositions are used for rapid repair, then heating time is reduced, but the composition does not compact properly and develops deep ruts
Solution Approach 1:
The patent changes the thermal state parameter of the composition by incorporating conductive particles that enable rapid electromagnetic heating. This allows the composition to be applied in a cooler state (reducing thermal stress and rutting) while still achieving proper compaction temperature quickly through induction heating, thus maintaining both speed and quality.
Solution Approach 2:
The patent replaces slow thermal conduction with rapid electromagnetic induction heating, enabling the composition to achieve compaction temperature in minutes rather than hours. This substitution allows cold or cool composition application without sacrificing compaction quality, as the material reaches optimal working temperature rapidly after placement.
3Productivity
If induction particles with different size than aggregate are used, then heating efficiency may improve, but the composition structure and strength are compromised
Solution Approach 1:
The patent optimizes the size parameter of induction particles to be within 0.075mm to 19mm, making up 10-50% of total aggregate by volume. This parameter range balances two competing requirements: small enough particles heat more efficiently through eddy currents, while large enough particles maintain structural integrity and proper composition mechanics. The specific size range represents an optimized compromise between heating efficiency and structural strength.
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
Enables rapid and effective repair of runway damage, ensuring structural integrity and safety by achieving proper compaction and binding of the repair material, suitable for both military and civilian air traffic.
Implementation Method 1
An induction heater heats the composition within a container by generating a magnetic field that penetrates the container. The magnetic field creates eddy currents in the induction particles; these eddy currents in turn heat the composition.
Implementation Method 2
The magnetic field creates eddy currents in the induction particles; these eddy currents in turn heat the composition.
Implementation Method 3
An induction heater heats the composition within a container by generating a magnetic field that penetrates the container.
Data Source
AI summary
The present invention is a system for repairing asphalt. The system includes a discrete quantity of an asphalt repair composition located within a container and an induction heater. The composition is a combination of an asphalt binder, aggregate particles, and induction particles. The average diameter of the induction particles ranges from approximately 10% above to approximately 10% below an average diameter of the aggregate particles used in the composition. The induction heater heats the composition within the container by generating a magnetic field that penetrates the container. The magnetic field creates eddy currents in the induction particles. These eddy currents in turn heat the composition. Because the induction particles are distributed throughout the composition, the composition heats rapidly.