Magnetizable Concrete Composition for Low-Loss Inductive Charging
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Solution Overview
Problem
Existing concrete compositions do not adequately address the need for increased electromagnetic permeability and reduced energy dissipation, which is crucial for efficient inductive charging applications.
Innovation Solution
A fresh concrete composition comprising at least 60 vol.% aggregates with magnetizable particles, particularly sand, and a low paste volume, along with specific cement and mineral additions, enhances electromagnetic permeability and compressive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the aggregates volume is increased to ≥60 vol.-% to improve electromagnetic permeability, then the electromagnetic permeability increases, but the workability and pumpability of the fresh concrete deteriorate
Solution Approach 1:
The patent changes the water-to-binder ratio parameter to a low range (0.15-0.35) to reduce the paste volume and increase aggregates volume to ≥60 vol.-%. This parameter change improves electromagnetic permeability while the use of superplasticizers compensates for the workability reduction, resolving the contradiction between energy efficiency and ease of operation.
Solution Approach 2:
The patent uses composite material composition with specific combinations of cement, mineral additions (silica fume, fly ash, slag), and superplasticizers to create a concrete mix that achieves both high aggregates content for electromagnetic permeability and sufficient workability through chemical admixtures.
2Loss of energy
If the aggregates volume is increased to ≥60 vol.-% to improve electromagnetic permeability, then the electromagnetic permeability increases, but the fresh concrete becomes difficult to place and compact
Solution Approach 1:
The patent adjusts the water-to-binder ratio to a low range (0.15-0.35) and uses superplasticizers to modify the rheological properties of the fresh concrete, enabling proper placement and compaction despite the high aggregates volume of ≥60 vol.-% that is necessary for achieving the required electromagnetic permeability.
Solution Approach 2:
Superplasticizers act as intermediary chemical admixtures that facilitate the flow and compaction of fresh concrete with high aggregates content, mediating between the conflicting requirements of high electromagnetic permeability and ease of placement.
3Loss of energy
If the paste volume is reduced to increase aggregates volume, then the electromagnetic permeability increases, but the compressive strength may deteriorate
Solution Approach 1:
The patent employs composite material strategy by combining cement with multiple mineral additions (silica fume, fly ash, slag) in specific proportions. This composite binder system maintains compressive strength despite reduced paste volume, while allowing aggregates volume to reach ≥60 vol.-% for improved electromagnetic permeability.
Solution Approach 2:
The patent changes the chemical composition parameters of the binder system by incorporating mineral additions and adjusting the water-to-binder ratio, which enables the paste to provide sufficient strength development even at reduced volumes, thereby supporting the high aggregates content needed for electromagnetic performance.
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 composition achieves electromagnetic permeability greater than 40 and compressive strength above 100 MPa, enabling efficient inductive charging with reduced energy loss.
Implementation Method 1
One element affecting the performance of inductive chargers is the electromagnetic permeability of the concrete composition, which characterizes the capacity of a material to transmit electromagnetic energy generated by an electric coil.
Implementation Method 2
Magnetizable concrete compositions often comprise ferrite aggregates, which provides the material the desired electromagnetic properties.
Implementation Method 3
The transmitter unit comprises a molded body made of magnetizable concrete, which partially surrounds a primary coil. This provides an alternating magnetic field during operation, which interacts with the receiver unit.
Data Source
AI summary
A fresh concrete composition for producing a magnetizable concrete, including 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.-%.