Coated Aggregate Roadway Layer Induction Heating
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Solution Overview
Problem
Existing methods for producing electrically conductive roadways face issues such as interrupted electrical conductivity due to non-conductive binders, limited induction power from small additive surface areas, and poor heat transfer, requiring excessive energy consumption and large amounts of inductive material.
Innovation Solution
A method involving mixing mineral aggregates with different grain sizes, where large-grain rock grains coated with induction-capable materials are compacted to create electrical contact between them, utilizing ferromagnetic materials like aluminum with corrosion protection to enhance conductivity and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If induction-capable additives are added to the binder mixture, then electrical conductivity is achieved, but the electrical conductivity is interrupted by the non-conductive binder and the induction power is insufficient due to small surface area
Solution Approach 1:
The invention changes the parameter of surface area by using large-grained aggregates (2-45 mm) coated with ferromagnetic material instead of small additives. This increases the surface area from small additive particles to large aggregate surfaces, enabling sufficient induction power generation while maintaining electrical conductivity through the coated surfaces.
Solution Approach 2:
The invention creates a composite structure where ferromagnetic material is coated on the surface of rock grains or aggregates. This composite combines the structural properties of the aggregate with the electromagnetic induction properties of the ferromagnetic coating, achieving both mechanical strength and electrical conductivity with sufficient induction power.
2Temperature
If induction-capable aggregates are used to generate heat, then heating effect is achieved, but thermal conductivity is limited by the binder causing poor heat transfer to surrounding material
Solution Approach 1:
The invention changes the thermal conductivity parameter by using metallic binders instead of conventional organic binders. Metallic binders have significantly higher thermal conductivity, enabling efficient heat transfer from the heated aggregates to the surrounding road layer material, thus improving heat distribution and reducing energy loss.
3Power
If large amounts of inductive material are added to generate desired induction power, then induction power is sufficient, but the amount of material and complexity increase
Solution Approach 1:
The invention changes the parameter of grain size to large dimensions (2-45 mm) for the induction-capable aggregates. This allows sufficient induction power to be generated with a reasonable quantity of material, as the large surface area of each aggregate particle provides adequate interaction area with electromagnetic fields without requiring excessive amounts of inductive material.
4Power
If ferromagnetic material is used for coating, then additional heat is generated through magnetic reversal, but corrosion protection is needed to maintain electrical conductivity
Solution Approach 1:
The invention creates a multi-layer composite structure with ferromagnetic material coated on the aggregate surface, optionally with additional protective coatings. This composite structure combines the heat generation capability of ferromagnetic materials with the corrosion protection of protective coatings, maintaining both electrical conductivity and structural integrity over time.
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
This approach results in an electrically conductive roadway with optimal induction power consumption and efficient heat transfer, maintaining conductivity and protecting the induction material from corrosion after installation.
Implementation Method 1
The material capable of electrical induction is expediently ferromagnetic. Due to the ferromagnetic property, a magnetic reversal ('hysteresis') occurs, which is caused by the alternating magnetic field and generates additional heat.
Implementation Method 2
at least the large-grain rock grains are coated with a material capable of electrical induction
Implementation Method 3
compacting the resulting mixture in such a way that at least some of the coated rock grains are pressed against one another and an electrically conductive contact is produced between them
Data Source
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AI summary
Disclosed is a mineral substance for producing a roadway layer, characterized in that said mineral substance is composed of an accumulation of pebbles of different sizes, at least the large-size pebbles being coated with an electrically inductive material. Also disclosed are a method for producing said mineral substance, a roadway layer comprising the same, and a method for producing the roadway layer.