Roughened Waterproofing Membrane for Early Concrete Adhesion
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Solution Overview
Problem
Current waterproofing membranes in the construction industry face challenges with poor early adhesion strength to fresh concrete, leading to potential detachment when formwork is removed within 24 hours, especially in pre-applied waterproofing applications.
Innovation Solution
A sealing device comprising a barrier layer and a functional layer based on a highly-filled thermoplastic polymer composition with increased surface roughness, achieved through a foam extrusion process, which enhances early adhesion strength to concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-applied waterproofing membrane is used with smooth surface, then production cost is reduced, but early adhesion strength to concrete is insufficient causing detachment when formwork is removed
Solution Approach 1:
The patent changes the surface roughness parameter of the functional layer from smooth to increased roughness (Ra ≥ 0.4 μm) to improve early adhesion strength. This parameter change allows the membrane to maintain strong adhesion to concrete even after 24 hours, preventing detachment when formwork is removed, while still using cost-effective thermoplastic polymer compositions.
Solution Approach 2:
The functional layer is designed with a porous structure containing voids and cavities that increase surface roughness. These pores enable mechanical interlocking with fresh concrete, significantly improving early adhesion strength without requiring expensive alternative materials or complex multi-layer constructions.
2Reliability
If a non-woven fabric contact layer is added to improve bonding, then adhesion strength is improved, but seam sealing capability is lost and production cost increases
Solution Approach 1:
The functional layer serves multiple functions simultaneously: it provides adhesion promotion through increased surface roughness, maintains seam sealing capability through its thermoplastic composition that can be heat-welded, and reduces production cost by eliminating the need for separate non-woven fabric and adhesive layers. This multi-functional design simplifies the overall structure while achieving all required performance targets.
Solution Approach 2:
The patent merges the functions of the contact layer, adhesive layer, and barrier layer into a single integrated functional layer with unique dual-functionality. This consolidation eliminates the need for separate non-woven fabric and adhesive layers, reducing structural complexity while maintaining or improving adhesion performance and preserving seam sealing capability.
3Reliability
If highly-filled thermoplastic polymer composition is used with increased surface roughness, then early adhesion strength is improved, but production cost increases
Solution Approach 1:
The patent optimizes the filler content parameter within specific ranges (20-75 wt.% thermoplastic polymer, 25-80 wt.% solid filler) to achieve the desired surface roughness and adhesion performance. By carefully controlling these parameters, the formulation achieves high early adhesion strength without excessive filler content that would significantly increase production costs or compromise processability.
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 sealing device achieves high early adhesion strength, allowing formwork removal after 24 hours without detachment, and is produced with minimal increased production costs compared to traditional methods.
Implementation Method 1
increased surface roughness, achieved through a foam extrusion process
Data Source
AI summary
A sealing device includes a functional layer having a first major surface and a second major surface and a barrier layer directly or indirectly connected to the second major surface of the functional layer, wherein the functional layer has a surface roughness having a waviness factor Wf. Also disclosed is a method for producing a sealing device and the use of a sealing device for waterproofing of a substrate.