Waterproofing System Mechanical Interlocking Bond
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Solution Overview
Problem
Current waterproofing membranes in the construction industry face challenges such as poor bonding properties, increased complexity and costs due to the use of adhesives, and difficulty in detecting leaks, which can lead to water infiltration and loss of watertightness.
Innovation Solution
A waterproofing system comprising a functional layer with a thermoplastic polymer and solid particulate filler dispersed in a continuous thermoplastic phase, providing enhanced bonding to concrete and maintaining watertightness, even after infiltration, through its surface roughness and mechanical interlocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are used to bond the barrier layer to the contact layer and fresh concrete, then bonding strength is improved, but device complexity and production costs increase
Solution Approach 1:
The patent removes the adhesive layer from the waterproofing membrane structure. Instead of using adhesives to bond the barrier layer to the contact layer and fresh concrete, the invention relies on the mechanical interlocking capability of the contact layer itself, which is designed with a specific surface roughness and porous structure that enables direct bonding without additional adhesive materials.
Solution Approach 2:
The contact layer is designed to perform multiple functions simultaneously: it provides bonding to the barrier layer, bonding to fresh concrete, and mechanical interlocking all through its own structural properties (surface roughness, porosity) rather than requiring separate adhesive layers. This multi-functionality eliminates the need for additional adhesive components.
2Strength
If adhesive layers are used to bond the barrier layer to the contact layer and fresh concrete, then bonding strength is improved, but production costs increase
Solution Approach 1:
The patent removes the adhesive layer from the waterproofing membrane structure. Instead of using adhesives to bond the barrier layer to the contact layer and fresh concrete, the invention relies on the mechanical interlocking capability of the contact layer itself, which is designed with a specific surface roughness and porous structure that enables direct bonding without additional adhesive materials.
Solution Approach 2:
The invention eliminates the need for expensive adhesive materials by using a cost-effective contact layer design with optimized surface roughness and porosity. The contact layer's structural features provide sufficient bonding strength without requiring additional adhesive additives, thereby reducing production costs.
3Strength
If a contact layer with high bonding capability is used, then bonding to concrete is improved, but difficulty in detecting leaks increases
Solution Approach 1:
The contact layer is designed with localized functional zones: a porous outer surface for mechanical interlocking and bonding to fresh concrete, and an inner layer with specific surface roughness for bonding to the barrier layer. This local differentiation of properties allows strong bonding while maintaining leak detection capability through the porous structure that can indicate infiltration paths.
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 system achieves full and permanent bonding to concrete and other cementitious compositions, retains watertightness after infiltration, and reduces production costs by simplifying the membrane build-up process while ensuring reliable sealing.
Implementation Method 1
providing enhanced bonding to concrete and maintaining watertightness, even after infiltration, through its surface roughness and mechanical interlocking capabilities
Implementation Method 2
The adhesive should also enable the fresh concrete to penetrate deeply into to contact layer before hardening in order to provide high resistance to penetrating water
Implementation Method 3
a network of sealant between the barrier layer and the composite layer. The network of sealant is said to limit the size of area affected by penetrating water in case of water leakage in the barrier layer
Data Source
AI summary
A waterproofing system including a functional layer S1 including 10-80 wt.-% of at least one thermoplastic polymer P1 and 10-80 wt.-% of at least one solid particulate filler F, wherein the surface of the functional layer S1 has an Auto-correlation length of waviness W(Sal) of at least 50 μm. Further, a method for producing a waterproofing system and to the use of a mechanical surface treatment step to increase the waviness factor, determined as the ratio of the Root mean square roughness of waviness W(Sq) to the square of the Auto-correlation length of waviness W(Sal), of a surface of a functional layer S1.