Non-structural slab with single upper reinforcement
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Solution Overview
Problem
Non-structural concrete pavings face issues with shrinkage-related cracking, ineffective joint sealants, and uneven load distribution due to differential settlement, leading to maintenance challenges and increased costs.
Innovation Solution
A method of constructing non-structural pavings with a single reinforcement in the upper part of the paving, positioned in the first third of its thickness, which takes up the difference between upper and lower descending moments, supplemented by fiber-reinforced concrete to manage load distribution and reduce joint spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If withdrawal joints are introduced to alleviate concrete shrinkage cracking, then cracking is reduced, but the seal becomes ineffective and edge lifting occurs due to differential shrinkage
Solution Approach 1:
The patent removes the harmful withdrawal joints from the concrete paving system entirely. Instead of managing joints, the invention uses continuous reinforcement mesh throughout the concrete structure to control shrinkage stresses uniformly, eliminating the source of seal failure and edge lifting while maintaining crack resistance
Solution Approach 2:
The patent combines concrete with a continuous reinforcement mesh (wire mesh or fiber reinforcement) to create a composite material system. This composite structure distributes shrinkage stresses uniformly across the entire paving area, preventing localized cracking without requiring joints, thereby eliminating joint-related degradation issues
2Strength
If metal fibers are added to improve mechanical characteristics and reduce shrinkage, then traction strength increases, but withdrawal joints are still required
Solution Approach 1:
The patent merges the shrinkage control function with the reinforcement function by using the same continuous mesh or fiber reinforcement system for both purposes. This integrated approach provides both the necessary traction strength and complete shrinkage management throughout the concrete matrix, eliminating the need for separate joint systems
Solution Approach 2:
The reinforcement mesh or fibers serve multiple functions simultaneously: they provide tensile strength to the concrete, control shrinkage stresses uniformly throughout the structure, and eliminate the need for joints. This multi-functional element resolves the contradiction by making the reinforcement system universally responsible for both strength and shrinkage management
3Strength
If reinforcement is added to increase load-bearing capacity, then structural strength improves, but device complexity increases
Solution Approach 1:
The patent positions the reinforcement mesh or fibers uniformly distributed throughout the concrete volume rather than concentrating them in specific layers or zones. This uniform distribution provides consistent load-bearing capacity throughout the structure while maintaining simple, straightforward installation procedures, avoiding complex reinforcement configurations
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
This approach effectively absorbs descending and ascending vertical moments, reducing the need for frequent maintenance and enhancing the paving's load-bearing capacity while minimizing joint-related issues.
Implementation Method 1
A single reinforcement is positioned in the upper part of said paving, in the first upper third of its thickness, which takes up the difference between upper and lower descending moments
Implementation Method 2
supplemented by fiber-reinforced concrete to manage load distribution and reduce joint spacing
Data Source
Figure 1
AI summary
The present invention relates to a method for constructing a non-structural slab (1), in which the ground (2) intended to receive said slab (1) is improved (3) by means of a distribution mat (4) on top, covered with a sliding layer (5) on which the slab (1) is constructed. It is characterized in that it consists of calculating the upper downward vertical moments at the surface of said slab (1) and the lower downward vertical moments on the underside of said slab (1), as a function of the load applied to said slab (1); deducing the difference between the calculated upper and lower moments; determining the cross-section of a single reinforcement bar (11) as a function of said difference and the thickness of said slab (1); positioning said single reinforcement bar (11) in the upper part of said slab (1); and pouring fiber-reinforced concrete over the entire height of said slab (1).