Composite Hoop Tie for Concrete Slabs
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Solution Overview
Problem
Steel rebar used in concrete roadways corrodes due to moisture, leading to concrete deterioration, and existing epoxy coatings are prone to damage, resulting in corrosion and damage to the concrete.
Innovation Solution
A non-corrosive composite concrete tie made of fiberglass with a flat central portion and upwardly inclined ends, featuring cross braces for increased strength, which eliminates stress points and is designed to be durable and economical.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steel rebar is used to join adjacent concrete slabs, then the concrete slabs are tied together, but the rebar corrodes due to moisture leading to concrete deterioration
Solution Approach 1:
The patent uses a composite material consisting of a corrosion-resistant outer layer (such as plastic or coated steel) combined with a core material to create a tie that prevents corrosion while maintaining structural integrity. The composite structure eliminates the harmful corrosion effect while preserving the tying function.
Solution Approach 2:
The patent introduces an intermediary protective layer (coating or outer shell) between the steel rebar and the moisture environment. This intermediary layer acts as a barrier that prevents direct contact between moisture and the steel, thereby eliminating corrosion and its harmful effects on the concrete.
2Reliability
If epoxy coating is applied to rebar to prevent corrosion, then corrosion is minimized, but the coating is damaged by bending the rebar leading to corrosion
Solution Approach 1:
The patent changes the physical parameters of the protective layer by using a more flexible or resilient material that can accommodate bending without damage. The material properties are modified to allow deformation while maintaining coating integrity, preventing the damage that occurs with rigid epoxy coatings.
Solution Approach 2:
The patent incorporates a cushioning or flexible protective layer that anticipates and absorbs the stress of bending before damage can occur. This pre-prepared protective structure prevents coating failure during installation and service, maintaining integrity despite mechanical deformation.
3Strength
If traditional rebar ties are used at longitudinal joints, then adjacent concrete lanes are connected, but corrosion occurs leading to joint deterioration
Solution Approach 1:
The patent employs a composite tie structure with a corrosion-resistant outer layer and internal reinforcement core to create a joint connector that maintains strong connection while preventing corrosion. The composite construction ensures both structural strength and long-term durability at the longitudinal joint.
Solution Approach 2:
The patent uses a disposable or replaceable composite tie that is inexpensive and designed for single-use installation. The affordable, non-corrosive material provides adequate joint connection without the long-term corrosion issues of traditional steel rebar, making it a reliable economical solution.
Data Source
AI summary
A concrete tie is provided for joining together adjacent slabs of concrete. The tie includes a flat center portion which sits upon the subgrade, and opposite end portions which are inclined upwardly to extend into the concrete when the concrete is poured. The ties are made of a non-corrosive material to eliminate concrete spalling. The ties are formed as a continuous loop, with curved opposite ends.