Embedded Attachments in Precast Concrete with Carbon Fiber Reinforcement
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Solution Overview
Problem
Existing concrete structures reinforced with steel rebar face degradation issues due to corrosion, and carbon fiber rebar lacks sufficient bond strength and shear resistance, while attaching components to pre-stressed pre-cast concrete structures is challenging due to differential contraction rates.
Innovation Solution
A system and method involving resin-impregnated carbon fiber reinforcing bars with a predetermined twist pattern to enhance bond strength and shear resistance, and a process for attaching components by applying stress to reinforcing members within a pre-cast concrete structure, allowing uncured cement to encase and cure around them, ensuring mechanical bonding and uniform contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel rebar is used to reinforce concrete structures, then the concrete structure gains strength and integrity, but the steel rebar degrades over time due to corrosion into rust, diminishing the integrity of the concrete structure
Solution Approach 1:
The patent changes the material parameter of the reinforcing bar from steel to carbon fiber, fundamentally altering the chemical composition to eliminate corrosion susceptibility. This material substitution transforms the reinforcing bar into a corrosion-resistant component that maintains its mechanical properties over time, directly resolving the reliability issue while preserving strength requirements
Solution Approach 2:
The patent employs carbon fiber as a composite material to replace traditional steel rebar. Carbon fiber reinforced polymer (CFRP) provides the necessary mechanical strength while being inherently resistant to corrosion, thus achieving both strength and long-term reliability without the degradation problems associated with steel
2Ease of operation
If an embedded substrate is attached to pre-stressed pre-cast concrete structure, then components can be fastened to the structure, but the substrate may warp and the concrete structure may be weakened due to differential contraction rates
Solution Approach 1:
The patent ensures that the embedded substrate has similar elastic properties and contraction characteristics to the pre-stressed concrete structure. By matching the material properties and thermal expansion/contraction coefficients, the substrate contracts uniformly with the concrete when tension is released, preventing warping and maintaining structural integrity while still providing attachment capability
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 solution provides enhanced mechanical bonding and uniform contraction of reinforcing bars within pre-cast concrete structures, improving the integrity and durability of concrete structures and facilitating efficient attachment of components by ensuring consistent mechanical properties and reduced shear loads.
Implementation Method 1
the uncured cement is poured into the concrete form and bonds to the reinforcing members and the attachment members
Data Source
AI summary
System and method allows a component to attach to a pre-cast, pre-stressed concrete structure. The system includes a first attachment part, a pre-cast, pre-stressed concrete member and first and second reinforcing members. A first body of a first attachment part has a first concrete structure facing side and a first plurality of attachment members. The pre-cast, pre-stressed concrete member is formed from uncured cement. At least a portion of the attachment members are embedded within the pre-cast, pre-stressed concrete member. The first reinforcing member is placed under a first tension load and the second reinforcing member is placed under a second tension load. The pre-cast, pre-stressed concrete member is formed from uncured cement poured about at least a portion of the first and second reinforcing members while the first and second reinforcing members are under stress.