Concrete Body Surface Smoothing via Particle Segregation
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Solution Overview
Problem
Existing methods for producing concrete roof tiles result in a rough, porous surface due to the use of coarse-grained concrete, requiring additional coatings for sealing and smoothing, and involve complex processes with separate fine-grained top layers, which are difficult to manufacture and prone to porosity.
Innovation Solution
A method and system that utilize a single concrete mixture for extruded concrete bodies, where a profiling unit separates sand particles by size to create a grooved profile, and a leveling unit smooths the surface, distributing fine-grained concrete evenly to achieve a smooth, flat top with reduced surface roughness and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coarse-grained fresh concrete mixture is used for extrusion, then the manufacturing process is simple, but the surface becomes rough and porous requiring additional coatings
Solution Approach 1:
The concrete body is divided into two distinct zones based on sand particle distribution: a lower area with coarser sand particles and an upper cover layer with finer sand particles. This segmentation is achieved through the profiling unit that creates a groove profile, causing size-dependent separation where larger particles settle in the lower area and finer particles form the upper layer. This resolves the contradiction by maintaining simple single-mixture manufacturing while achieving differentiated surface quality.
Solution Approach 2:
Different regions of the concrete body are given different local qualities through particle size distribution. The cover layer (upper area) contains only fine sand particles creating a smooth surface, while the lower area contains coarser particles providing structural integrity. This local differentiation resolves the contradiction between manufacturing simplicity and surface quality by applying different material characteristics to different zones without requiring separate mixing processes.
2Manufacturing precision
If a separate fine-grained top layer is applied, then surface quality improves, but the production process becomes complex
Solution Approach 1:
The profiling unit combines multiple functions into a single device: it creates the groove profile for later painting, performs size-dependent separation of sand particles, and forms the cover layer with fine particles all in one operation. This merging eliminates the need for separate applications of fine-grained top layers and reduces production process complexity while maintaining improved surface quality.
Solution Approach 2:
The concrete mixture itself performs the separation function through the profiling unit. The size-dependent separation occurs automatically as the concrete is extruded and profiled, with finer particles naturally forming the cover layer and coarser particles remaining in the lower area. This self-service mechanism eliminates the need for additional equipment or processes to apply separate top layers.
3Manufacturing precision
If very fine sand is used in the concrete mixture, then surface smoothness improves, but porosity and air pocket formation increase
Solution Approach 1:
Very fine sand is used locally in the cover layer (upper area) to achieve surface smoothness, while coarser sand particles are concentrated in the lower area to provide structural integrity and reduce porosity. This local quality differentiation allows the use of very fine sand where needed for smoothness without the harmful porosity effects throughout the entire concrete body.
Solution Approach 2:
The concrete is segmented into a porous lower area with coarser particles and a dense cover layer with very fine particles. This segmentation allows the fine sand to be used in the cover layer for smoothness while the coarser particles in the lower area provide porosity resistance, resolving the contradiction between surface smoothness and porosity prevention.
4Object-generated harmful factors
If a grooved profile is applied to the surface, then mechanical grip for coating is improved, but surface roughness increases
Solution Approach 1:
The grooved profile is segmented into two functional zones: the groove crevices provide mechanical grip for coating adhesion, while the groove elevations (ridges) consist of fine-grained concrete that forms a smooth cover layer after leveling. This segmentation allows the profile to simultaneously improve coating adhesion through groove geometry while maintaining surface smoothness through the fine particle composition of the elevations.
Solution Approach 2:
Different parts of the grooved profile have different local qualities: the groove valleys provide mechanical interlocking for coating adhesion, while the groove elevations are composed of fine sand particles that create a smooth surface after leveling. This local quality differentiation resolves the contradiction between improving coating adhesion and maintaining surface smoothness.
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 method produces concrete bodies with significantly reduced surface roughness, allowing for less paint application and preventing air pockets, while enabling the use of very fine sand without increased porosity, resulting in improved surface quality and manufacturing ease.
Implementation Method 1
By means of the profiling unit and depending on their profile, the sand particles are separated according to their particle size, with large sand particles being displaced inwards from the surface area of the concrete body
Implementation Method 2
The elevations are crushed, whereby the fine-grained concrete of the elevations is distributed into a top layer
Data Source
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AI summary
The invention relates to a method for producing a concrete body (2) having a planar upper side (1), wherein a high surface quality is obtained. In the method, a concrete body (2) is extruded from unset concrete and is provided with a groove profile at the upper side (1) thereof by means of a profiling unit. By means of the profiling unit and depending on the comb-shaped profile thereof, the sand particles are separated according to size, wherein large sand particles are displaced from the surface area of the concrete body (2) toward the inside, this being toward the interior of the concrete body (2). Only fine sand particles can pass the profile, whereby raised areas of the groove profile are formed, which are made of extremely fine-grained unset concrete. Subsequently, the upper side (1) of the concrete body (2) is leveled by means of a leveling unit, wherein the raised areas of the groove profile are crushed and the fine-grained unset concrete of the raised areas of the groove profile is distributed to form a cover layer (19).