Water-Activated Expansion Joint Seal System for Remote Installation
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Solution Overview
Problem
Conventional expansion joint seal systems face challenges in remote environments due to packaging issues, environmental changes affecting fillers and retardants, and the need for pre-compressed foam, which can lead to unusable products and logistical problems during delivery and installation.
Innovation Solution
A water-activated impregnation solute with a solute volume weight at least twice that of the foam body, providing a peel strength of 1.71-28.55 lb/in, is used to create a resiliently-compressible foam seal system that can be assembled on-site, eliminating the need for pre-compression and packaging, allowing for easy transport and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foam-based joint seals are pre-compressed and packaged to maintain compression ratio, then sealing performance is improved, but packaging failures and logistical problems occur in remote environments
Solution Approach 1:
The joint seal system is divided into separate components: an unexpanded foam member and a separate expansion agent contained in a breakable container. This segmentation allows the foam to be transported in an unexpanded state (improving logistics) while still achieving the required compression ratio when assembled (maintaining sealing performance).
Solution Approach 2:
The foam member is pre-prepared with embedded breakable containers holding expansion agent, but the actual expansion action is deferred until installation. This preliminary preparation allows the foam to be manufactured and transported in a stable, unexpanded state, then activated on-site when needed.
2Reliability
If fillers, retardants, coatings and membranes are incorporated into foam, then fire-rating and performance requirements are met, but environmental changes cause drying and hardening during shipping
Solution Approach 1:
The foam member is designed with controlled porosity and the expansion agent is contained in breakable containers, allowing the foam to maintain an unexpanded state during transport. This parameter control prevents premature drying and hardening while still enabling the foam to achieve proper density and performance after expansion and compression at installation.
3Ease of operation
If foam is provided in pre-compressed form, then installation is simplified, but the product becomes unusable if packaging fails during transport
Solution Approach 1:
The breakable containers containing expansion agent are embedded within the foam member during manufacturing. This beforehand preparation ensures that if packaging fails during transport, the foam remains in a stable unexpanded state and can still be activated on-site by simple mechanical compression, preventing complete product failure.
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 ensures a durable, water-resistant seal that maintains flexibility and adhesion, reducing logistical issues and environmental sensitivity, while allowing for on-demand assembly and installation in remote areas.
Implementation Method 1
the water-activated impregnation solute is adapted to provide a peel strength of 1.71-28.55 lb/in (3.0-50.0 N/cm) at an outer surface of the body of the foam after the volume of the water-activated impregnation solute is combined with water and manually impregnated into the body of the foam
Implementation Method 2
a body of an open-celled and resiliently-compressible foam
Data Source
AI summary
An expansion joint seal system with a water-activated impregnation solute, and a body of an open-celled and resiliently-compressible foam, where the volume of the water-activated impregnation solute may be combined on-site and on-demand with water and manually impregnated into the body of the foam for insertion.