Road Reinforcement Veil and Mat for Crack Resistance
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Solution Overview
Problem
Existing road surface reinforcement methods for cold surface coatings are inadequate in flexibility and ease of installation, particularly on irregular surfaces and bends, and fail to effectively impregnate fibers with the bonding layer, leading to rapid wear and decohesion of aggregates.
Innovation Solution
A reinforcement system comprising a permeable non-woven polyolefin veil-type support and a mat of high tenacity fibers without attachment, allowing the bonding binder to impregnate the fibers and aggregates, enhancing mechanical strength and flexibility, and facilitating easier unrolling and bonding of layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a veil-type support with attached mat is used, then the reinforcement structure is stable, but the flexibility and ease of installation on bends are reduced
Solution Approach 1:
The reinforcement is divided into two separate components: a veil-type support and a mat of high tenacity fibers. This segmentation allows each component to perform its specific function independently - the veil provides flexibility and conformability to irregular surfaces, while the mat provides tensile strength. The separate components can be installed independently, improving ease of installation on bends and irregular surfaces.
Solution Approach 2:
A permeable bonding binder acts as an intermediary between the veil-type support and the mat. This bonding binder impregnates the veil and bonds the mat to it, creating a stable composite structure while allowing the components to remain distinct during installation. The bonding binder enables the mat to conform to the irregularities of the road surface while maintaining structural integrity.
2Strength
If high tenacity fibers are used, then the resistance to crack propagation is improved, but the flexibility and ability to mix with bituminous materials is reduced
Solution Approach 1:
The reinforcement system separates the structural function (provided by the high tenacity fibers in the mat) from the adaptability function (provided by the veil-type support). The mat contains discrete high tenacity fibers that provide crack resistance, while the veil provides flexibility and the ability to conform to surfaces. This segmentation allows each component to optimize its specific function without compromise.
Solution Approach 2:
The veil-type support is designed with high porosity and permeability, allowing bonding binder and bituminous materials to pass through and impregnate the structure. This porous structure enables the reinforcement to mix with and bond to bituminous materials while the high tenacity fibers in the mat maintain their structural integrity and crack resistance properties.
3Strength
If an impermeable support is used, then the structural integrity is improved, but the impregnation with bonding layer is prevented
Solution Approach 1:
The system separates the impermeable structural support function (mat of high tenacity fibers) from the bonding function (veil-type support). The mat provides structural integrity and crack resistance, while the permeable veil allows bonding binder to pass through and create effective bonds with the underlying and overlying layers. This segmentation resolves the contradiction between impermeability and bondability.
Solution Approach 2:
The reinforcement system is a composite structure combining a permeable veil-type support made of synthetic fibers with a mat of high tenacity fibers. The composite structure leverages the complementary properties of each material: the veil provides permeability for bonding while the mat provides structural integrity. Together they create a reinforcement system that achieves both structural strength and effective bonding.
4Strength
If fibers are bonded together in a mat, then the structural strength is improved, but the ability to unroll and deform in bends is reduced
Solution Approach 1:
The reinforcement is segmented into a flexible veil-type support and a structurally strong but separate mat. The veil can be easily unrolled and deformed to conform to irregular surfaces and bends, while the mat provides structural strength when positioned and bonded. This segmentation allows the components to be optimized for their respective functions without compromising either flexibility or strength.
Solution Approach 2:
The veil-type support acts as a flexible thin film that can be easily unrolled, deformed, and conform ed to irregular road surfaces and bends. This flexible veil provides the necessary adaptability during installation, while the separately positioned mat of high tenacity fibers provides the structural strength needed for crack resistance.
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 a flexible and durable road surface reinforcement that effectively bonds layers, improves resistance to cracking and wear, and simplifies the installation process, offering a more economical and efficient alternative to existing solutions.
Implementation Method 1
a veil-type support comprising synthetic fibers made of non-woven polyolefins, this veil-type support also being permeable to the bonding binder
Implementation Method 2
this veil-type support also being permeable to the bonding binder
Data Source
Figure 1~2b
Figure 3~4
AI summary
The invention relates to a road surfacing reinforcement (10) of the cold surface dressing type comprising at least one layer of bonding binder (4) and a layer of aggregates (3), said reinforcement being intended for being deposited on said layer of bonding binder (4), characterised in that said reinforcement (10) comprises: - a web-like substrate (11) comprising non-woven polyolefin synthetic fibres; said web-like substrate being permeable to said bonding binder; and - a mat (13) consisting of high-tenacity fibres (12); said fibres (12) being intended for receiving the layer of aggregates (3); and in that said reinforcement (10) is not provided with means for bonding the mat (13) to the substrate (11).