Magnetizable Concrete Composition for Inductive Charging Permeability
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Solution Overview
Problem
Current magnetizable concrete compositions have limitations in electromagnetic permeability, leading to energy dissipation and longer charging times for electric vehicles, necessitating an improvement in concrete compositions to enhance electromagnetic permeability and reduce energy loss.
Innovation Solution
A fresh concrete composition with a high volume percentage of magnetizable aggregates, such as ferrite sand, combined with specific amounts of cement and mineral additions, optimized with a water/cement ratio and the inclusion of superplasticizers, to achieve increased electromagnetic permeability and ultra-high performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the volume percentage of magnetizable aggregates is increased to improve electromagnetic permeability, then the electromagnetic permeability increases, but the workability and pumpability of the fresh concrete deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the water-to-cement ratio to specific ranges (0.20-0.35 for ultra-high performance, 0.25-0.40 for high performance) and controlling aggregate volume percentages (60-70 vol.-% for ultra-high, 65-75 vol.-% for high performance). These precise parameter adjustments enable the concrete to achieve high electromagnetic permeability while maintaining adequate workability through controlled viscosity and flow characteristics.
Solution Approach 2:
The patent uses composite materials by combining magnetizable aggregates (ferrite, magnetite, or their mixtures) with cementitious binders and mineral additions in specific proportions. The composite structure integrates the electromagnetic properties of ferrite-based aggregates with the binding properties of cement and mineral additions, creating a material that simultaneously provides high electromagnetic permeability and structural integrity while managing workability.
2Reliability
If the volume percentage of magnetizable aggregates is increased to improve electromagnetic permeability, then the electromagnetic permeability increases, but the flowability of the fresh concrete deteriorates
Solution Approach 1:
The patent controls flowability by adjusting the water-to-cement ratio within specific ranges and by controlling the particle size distribution of aggregates. The D10-D90 particle size ranges are optimized to ensure proper packing and reduce inter-particle friction, thereby maintaining flowability despite high aggregate content. The patent specifies flowability metrics (spread ≥150 mm, V-funnel flow time ≤15 seconds) that are achieved through these parameter optimizations.
Solution Approach 2:
The patent applies local quality by using different particle size fractions of aggregates (D10, D50, D90 specifications) that are distributed throughout the mixture. This gradation creates optimal packing arrangements where finer particles fill voids between coarser particles, reducing overall porosity and improving flow characteristics while maintaining high aggregate volume for electromagnetic performance.
3Reliability
If the volume percentage of magnetizable aggregates is increased to improve electromagnetic permeability, then the electromagnetic permeability increases, but the charging time for electric vehicles increases
Solution Approach 1:
The patent resolves this contradiction by optimizing the electromagnetic permeability parameter to specific ranges (μr ≥40 for ultra-high performance, μr ≥30 for high performance) through controlled aggregate content and composition. By achieving sufficiently high electromagnetic permeability within these parameter ranges, the concrete enables efficient electromagnetic field transmission that reduces energy loss and accelerates inductive charging, thereby reducing charging time despite the high aggregate content.
Solution Approach 2:
The patent applies the skipping principle by enabling rapid energy transfer through the optimized magnetizable concrete medium. The high electromagnetic permeability allows the electromagnetic field to penetrate and transfer energy quickly through the concrete barrier, effectively 'skipping' the potential delay that would otherwise be caused by energy dissipation in non-optimized materials, thus reducing overall charging 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
The resulting concrete exhibits enhanced electromagnetic permeability and compressive strength, reducing energy dissipation and charging time, making it suitable for efficient inductive applications like electric vehicle charging.
Implementation Method 1
Magnetizable concrete compositions often comprise ferrite aggregates, which provides the material the desired electromagnetic properties
Data Source
AI summary
Fresh concrete composition for producing a magnetizable concrete, comprising 250-450 kg/m3 of cement, 50-150 kg/m3 of a mineral addition, 2900-3500 kg/m3 of aggregates containing magnetizable particles, and 100-150 kg/m3 water, wherein the sand volume is ≥ 60 vol.-%.