Layered Pavement Structure with Geotextile and Insulation
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Solution Overview
Problem
Existing pavement structures face damage due to frost heaving and thaw weakening, leading to increased maintenance and rehabilitation costs, as they lack simultaneous water-proofing, thermal insulation, and ground reinforcement, which are necessary to prevent damage from frost penetration.
Innovation Solution
A flexible pavement structure comprising a layered system with a geotextile fabric for ground stabilization, a cross-linked polyethylene foam laminated aluminum foil for waterproofing and thermal insulation, and a glass foamed insulation material for additional thermal insulation and reinforcement, all placed between the base and sub-base layers to limit frost penetration and enhance bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thermal insulation is used to limit frost penetration, then frost heaving is reduced, but the pavement structure lacks simultaneous water-proofing and ground reinforcement
Solution Approach 1:
The patent combines multiple functional layers (geotextile fabric for reinforcement, waterproof membrane for water-proofing, thermal insulation layer for frost protection) into a single integrated pavement structure system, allowing simultaneous achievement of ground reinforcement, water-proofing, and thermal insulation functions
Solution Approach 2:
The invention uses composite material construction with distinct layers serving different functions: geotextile fabric for mechanical reinforcement, waterproof membrane for moisture barrier, and thermal insulation material for frost protection, creating a multi-functional composite pavement structure
2Reliability
If multiple separate layers are added for water-proofing, thermal insulation, and reinforcement, then pavement durability is improved, but the device complexity increases
Solution Approach 1:
The patent divides the pavement structure into distinct functional segments or layers, where each layer (geotextile fabric, waterproof membrane, thermal insulation layer) performs a specific function, allowing for modular construction and maintenance while achieving comprehensive protection
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 layered system effectively reduces frost penetration, minimizes road network damage, and decreases rehabilitation costs by providing simultaneous water-proofing, thermal insulation, and reinforcement, thereby improving the durability and impermeability of the pavement structure.
Implementation Method 1
a cross-linked polyethylene foam laminated aluminum foil for waterproofing and thermal insulation
Implementation Method 2
a glass foamed insulation material for additional thermal insulation and reinforcement
Implementation Method 3
a geotextile fabric for ground stabilization, a cross-linked polyethylene foam laminated aluminum foil for waterproofing and thermal insulation
Implementation Method 4
a cross-linked polyethylene foam laminated aluminum foil for waterproofing and thermal insulation
Data Source
AI summary
A flexible pavement structure comprises a surface layer, a base layer, a sub-base layer, and a subgrade layer. Herein, the surface layer is adjacent to and above the base layer, and the sub-base layer is adjacent to and above the subgrade layer. The flexible pavement structure further comprises a layered system composed of first, second, and third materials different from each other, and is disposed as an interface layer between the base layer and the sub-base layer. The first material is a geotextile fabric selected from a group consisting of polypropylene and polyethylene, providing ground stabilization or reinforcement properties. The second material is a waterproof heat insulation material selected from a group consisting of cross-linked polyethylene foam and laminated aluminum foil, providing waterproofing or impermeability properties. The third material is a glass foamed insulation material.