Joint Sealing Profile for Precast Concrete Slabs
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Solution Overview
Problem
Existing joint filling solutions for precast concrete slabs often detach over time due to high pressures, leading to air leaks and contamination, and fail to meet requirements for durability, hygiene, and moisture sealing.
Innovation Solution
A joint filling profile with a widened horizontal section and a vertical leg made of epoxy resin-based compound, featuring a T-shaped cross-section with absorbent fabric and a foam insert to prevent adhesion to the substrate, and a coating that matches the surface level, minimizing detachment and enhancing elasticity and hygiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional joint filling methods are used with direct adhesion to concrete slabs, then initial sealing is achieved, but detachment occurs over time due to high pressures from vehicle traffic
Solution Approach 1:
The patent extracts the harmful adhesion function from the joint filling system by introducing a release agent layer between the joint compound and the concrete slab. This allows the joint compound to be applied without permanent bonding, preventing detachment under traffic loads while maintaining sealing functionality.
Solution Approach 2:
A release agent acts as an intermediary layer between the joint compound and the concrete slab surface. This intermediary prevents direct adhesion, allowing the joint filling to remain flexible and resistant to detachment from vehicle traffic pressures over time.
2Reliability
If joint filling is applied to seal the joint, then sealing is achieved, but edges create collection points for dirt and contamination
Solution Approach 1:
The patent applies a coating to the joint filling that creates a curved, rounded surface profile instead of sharp edges. This curved surface eliminates collection points for dirt and contaminants while maintaining the sealing function, as there are no ledges or sharp transitions where debris can accumulate.
Solution Approach 2:
The coating applied to the joint filling provides a finished surface that matches the surrounding floor appearance. This not only aesthetic purpose but also creates a seamless transition that prevents contamination accumulation by eliminating visual and physical edges.
3Strength
If joint compound adheres strongly to the substrate, then initial bond is achieved, but elasticity is reduced leading to detachment under pressure
Solution Approach 1:
The patent removes the adhesion function entirely by using a release agent, allowing the joint compound to maintain full elasticity without being constrained by strong bonding to the substrate. This enables the joint filling to flex and move with the joint while preventing detachment.
Solution Approach 2:
The release agent changes the adhesion parameter from high (strong bond) to low or zero (no bond), fundamentally altering the interaction between the joint compound and substrate. This parameter change preserves elasticity while preventing the detachment that would result from strong adhesion under cyclic loading.
4Reliability
If the joint surface is left exposed, then sealing function is maintained, but moisture infiltration and hygiene issues occur
Solution Approach 1:
The coating applied to the joint filling creates a finished, continuous surface that is flush with the surrounding floor. This coating acts as a protective barrier against moisture infiltration while maintaining the sealing function, and its appearance matches the floor to create a hygienic, seamless surface.
Solution Approach 2:
The joint filling system becomes a composite structure with the joint compound providing sealing and the coating providing moisture protection and hygiene. This composite approach combines the advantages of both materials to achieve superior performance in sealing, moisture resistance, and hygiene.
Data Source
AI summary
The method involves carrying out a joint enlargement at free upper edges of prefabricated plates adjacent to each other. The joint enlargement runs horizontally. The joint is filled in the joint enlargement with joint sealing compound in surface binding manner. An independent claim is included for a joint filling profile for forming a joint sealing suitable for prefabricated technique.