Adherent Layer for Geo-Membrane Bonding and Sag Prevention
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Solution Overview
Problem
Geo-membranes used to prevent moisture and soil gases from penetrating concrete slabs often sag due to soil settlement, leading to separated seams and inadequate sealing, and the low surface friction between concrete and geo-membranes results in uneven cracking and structural issues.
Innovation Solution
An adherent layer with a textured surface and adhesive properties is applied to the geo-membrane and concrete slab, forming a mechanical and adhesive bond to prevent sagging and ensure a continuous seal, thereby maintaining the geo-membrane's contact with the concrete and preventing moisture infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a geo-membrane is laid on the ground to prevent moisture and soil gases from penetrating concrete slabs, then moisture and soil gas infiltration is prevented, but the geo-membrane sags due to soil settlement causing seam separation and sealing failure
Solution Approach 1:
An adherent layer is introduced as an intermediary between the geo-membrane and the concrete slab. This adherent layer has adhesive properties that bond to both the geo-membrane and the concrete, providing mechanical anchorage that prevents the geo-membrane from sagging and separating at seams when soil settlement occurs.
Solution Approach 2:
The surface friction parameter between the geo-membrane and the underlying surface is modified by adding the adherent layer. This layer increases the friction and bonding capability, transforming the smooth, low-friction geo-membrane surface into one with enhanced adhesion to the concrete slab, thereby maintaining seam integrity during soil settlement.
2Ease of manufacture
If the geo-membrane surface has low friction to allow concrete placement, then concrete installation is facilitated, but the concrete slab does not crack evenly at control joints causing structural issues
Solution Approach 1:
The adherent layer provides locally varied friction characteristics - it maintains low friction where concrete needs to slide for placement, but provides high friction and bonding at control joint locations to ensure even cracking. This spatial variation in friction quality allows both easy concrete placement and uniform crack patterns.
Solution Approach 2:
The friction parameter of the geo-membrane surface is modified by the adherent layer to achieve optimal values for both concrete placement and crack control. The adherent layer creates a balanced friction environment that facilitates concrete installation while ensuring proper stress distribution for uniform cracking at control joints.
3Ease of manufacture
If single-sided adhesive tape is used to seal geo-membrane sections, then installation is simple, but the seal fails when soil settles or shifts unevenly
Solution Approach 1:
The adherent layer serves as a robust intermediary bonding system between geo-membrane sections, replacing the inadequate single-sided adhesive tape. This adherent layer provides superior mechanical anchorage and adhesion that maintains seam integrity under soil settlement and uneven shifting conditions, while still being relatively simple to install.
Solution Approach 2:
The adherent layer appears to be a composite material combining adhesive properties with mechanical reinforcement characteristics. This composite structure provides both the simplicity of adhesive application and the durability needed to maintain seam seals under varying soil conditions, overcoming the limitations of simple adhesive tape.
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 adherent layer effectively prevents water and moisture penetration, reducing the risk of mold, structural damage, and promoting even cracking patterns in concrete slabs by maintaining the geo-membrane's integrity and enhancing its sealing capabilities.
Implementation Method 1
an adherent layer with a textured surface and adhesive properties is applied to the geo-membrane and concrete slab, forming a mechanical and adhesive bond
Implementation Method 2
a textured surface on the other side, to attach the adherent layer to the concrete slab
Data Source
AI summary
The present disclosure describes embodiments of an adherent layer that may be used to attach a geo-membrane to a concrete slab and methods that include installation of the adherent layer. The adherent layer can be used to inhibit the geo-membrane from becoming disengaged with the concrete slab and can thereby help prevent water from penetrating the geo-membrane and causing moisture damage to the structure above.