Textured Adhesive Mortar for Wood-Concrete Composite Ceilings
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Solution Overview
Problem
Existing methods for producing wood-concrete composite ceilings are dependent on weather conditions, require complex mechanical processing, or necessitate the use of devices for granule distribution, leading to potential bond defects and inefficiencies in force transmission.
Innovation Solution
Applying adhesive mortar to the wood surface with a textured structure, allowing flowable concrete to penetrate and interlock, forming a positive connection, and using screws for additional support, while ensuring dimensional stability and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied and granules are sprinkled to create bond, then bond strength is improved, but device complexity increases due to requirement of granule distribution device
Solution Approach 1:
The patent removes the granule distribution device from the system by directly applying textured adhesive mortar that creates mechanical interlocking through its surface texture. The adhesive mortar itself provides the rough surface that interlocks with concrete, eliminating the need for separate granules and their distribution apparatus.
Solution Approach 2:
The invention uses composite adhesive mortar combining adhesive material with textured surface structure. This composite material provides both bonding function and mechanical interlocking capability through its textured surface, replacing the need for separate granules and distribution devices.
2Productivity
If wet-on-wet bonding is used to speed up process, then productivity is improved, but reliability deteriorates due to weather dependence and adhesive shift
Solution Approach 1:
The adhesive mortar is applied with pre-formed texture structure before concrete placement. This preliminary texturing creates immediate mechanical interlocking capability, allowing the adhesive to maintain its position and bonding effectiveness without requiring immediate concrete coverage, thus reducing weather dependence and adhesive shift risks.
Solution Approach 2:
Instead of making the adhesive layer thin and relying on rapid setting, the invention inverts the approach by creating a thick textured layer that derives its bonding strength from mechanical interlocking of the texture rather than solely from adhesive chemistry. This allows more time for proper bonding without weather sensitivity.
3Strength
If mechanical processing is used to create slots for sheet metal, then bond strength is improved, but ease of manufacture deteriorates due to milling or sawing requirements
Solution Approach 1:
The patent replaces mechanical processing (milling or sawing slots) with direct application of textured adhesive mortar. The texture is created by the application process itself rather than by removing material, eliminating the need for complex mechanical processing equipment and steps.
Solution Approach 2:
The invention changes the parameter of surface preparation from material removal (milling/sawing) to material addition (applying textured adhesive). This parameter change transforms a complex subtractive manufacturing process into a simpler additive process that achieves equivalent or superior bonding.
4Strength
If precast elements with recesses are used, then bond strength is improved, but device complexity increases due to requirement of turning elements and special formwork
Solution Approach 1:
Instead of creating recesses in precast elements and turning them over, the invention inverts the approach by applying textured adhesive directly to the wood surface in the desired orientation. This eliminates the need for complex formwork and element manipulation while achieving the same mechanical interlocking effect.
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
Enables reliable shear force transfer and load-bearing capability in wood-concrete composite slabs, suitable for on-site application and renovation, with improved bond strength and reduced mechanical processing requirements.
Implementation Method 1
an adhesive mortar is applied to a top surface of a wood slab, thereby creating a material-bonded connection between the top surface of the wood slab and the adhesive mortar
Implementation Method 2
the surface of the adhesive mortar facing away from the wood slab is textured, particularly during the application of the adhesive mortar, so that the textured surface has raised areas and/or depressions. Finally, flowable concrete is applied to form a concrete layer on the textured surface of the adhesive mortar, so that after the concrete has hardened, a positive connection is formed between the textured surface of the adhesive mortar and the concrete layer
Data Source
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AI summary
The invention relates to a method for producing a wood-concrete composite ceiling, in which the application of an adhesive mortar to a top surface of a wood ceiling and thereby the creation of a material-bonded connection between the top surface of the wood ceiling and the adhesive mortar, the structuring of a surface of the adhesive mortar facing away from the wood ceiling, in particular during the application of the adhesive mortar, so that the structured surface has elevations and/or depressions, and the application of flowable concrete to form a concrete layer on the structured surface of the adhesive mortar is provided, so that after the concrete has hardened a positive fit is formed between the structured surface of the adhesive mortar and the concrete layer.