Foam Board Building Panel with Embedded Concrete Bars
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Solution Overview
Problem
Building panels with foam cores and single-sided rigid facers lack dimensional stability and flatness, especially under varying weather conditions due to differing thermal expansion properties between the foam and facer materials.
Innovation Solution
Embedding reinforcing concrete bars with fibers into the foam board, either on the front or rear side, to enhance rigidity, bending strength, and prevent warping, while maintaining low weight and improved flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid thin facers are applied on one side of the foam layer to achieve required rigidity and strength, then mechanical strength is improved, but dimensional stability and flatness deteriorate under varying weather conditions
Solution Approach 1:
The patent applies asymmetric reinforcement by embedding reinforcing concrete bars only on one side of the foam board (either front or rear side), rather than symmetric reinforcement on both sides. This asymmetric configuration provides the necessary mechanical strength while minimizing the negative thermal expansion effects, as the single reinforced side acts as a stable reference plane that counteracts foam expansion without creating differential stress across the panel.
Solution Approach 2:
The patent changes the material parameters by using concrete bars with specific thermal expansion coefficients that better match the foam board than traditional rigid facers. The concrete bars have intermediate thermal expansion properties between the foam and traditional cement facers, reducing differential thermal stress. Additionally, the bars are embedded at optimized depths and spacing to balance mechanical support with thermal compatibility.
2Strength
If traditional rigid facers are used, then mechanical strength is improved, but thermal expansion compatibility deteriorates due to significant differences in expansion coefficients
Solution Approach 1:
The reinforcing concrete bars function as an intermediary element between the foam board and the external environment. Rather than using traditional rigid facers with highly incompatible thermal expansion coefficients, the concrete bars provide a intermediate thermal bridge that reduces differential expansion. The bars are embedded within the foam board structure, creating a graduated transition zone that mediates the thermal stress between the expanding foam and the more stable concrete reinforcement.
3Use of energy by moving object
If foam board thickness is increased to improve insulation, then thermal insulation is improved, but weight and susceptibility to warping increase
Solution Approach 1:
The patent creates a composite structure combining foam board with embedded reinforcing concrete bars. This composite configuration allows the use of thinner foam boards for the same insulation performance, as the concrete bars provide structural rigidity that prevents warping and bowing. The composite design optimizes the weight-insulation-strength triad by allowing reduced foam thickness (less weight) while maintaining insulation through the composite thermal barrier and providing warping resistance through the embedded bars.
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 solution provides improved mechanical properties, including high tensile and compressive strength, low thermal expansion, and water resistance, minimizing warping and bowing under changing weather conditions, making the panel suitable for various building applications.
Implementation Method 1
The coefficient of linear thermal expansion of polystyrene foam, for example, is about 6 times higher than the coefficient of linear thermal expansion of a facing based on cement mortar
Data Source
Figure 1(a)~1(g)
Figure 2(a)~2(e)
Figure 3(a)~3(d)
AI summary
The invention relates to a building panel (1) comprising a foam board (2) having a front side and a rear side opposite to the front side. According to the invention, it is proposed that at least one reinforcing concrete bar (3) is embedded into the foam board (2), in particular at the front side or rear side of the foam board (2). The invention furthermore relates to a method of manufacturing a building panel.