Non-solidifying Rubberized Asphalt Intermediate Layer
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Solution Overview
Problem
Conventional drainage asphalt pavements face issues with water or moisture penetration, early damage, low inter-aggregate coupling strength, and high repair costs due to inadequate intermediate layers, which compromise drainage and noise-reducing performances.
Innovation Solution
A non-solidifying rubberized asphalt composition is used to form an impermeable drainage intermediate layer through a single paving process, enhancing adhesive strength and coupling between layers, while providing waterproofing and noise-reducing functions, and reducing the thickness and cost of the pavement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional drainage asphalt pavement is used with traditional intermediate layer, then drainage function is provided, but water penetration and moisture damage occur due to poor waterproofing
Solution Approach 1:
The patent changes the physical and chemical parameters of the asphalt binder by using a non-solidifying rubberized asphalt with specific viscosity range (3,000 to 10,000 cP at 15°C) and softening point (70°C to 95°C). This parameter optimization enables the asphalt to remain flexible and adhesive at low temperatures while maintaining waterproofing effectiveness, preventing water penetration that occurs with conventional solidifying asphalts
Solution Approach 2:
The patent creates a composite material by incorporating rubber particles (5% to 20% by weight of asphalt binder) into the asphalt matrix. This rubberized asphalt composite provides enhanced elasticity, adhesion, and waterproofing properties, effectively preventing water penetration while maintaining the drainage function of the pavement structure
2Strength
If conventional drainage pavement is used, then drainage function is achieved, but inter-aggregate coupling strength is low causing early damage
Solution Approach 1:
The patent optimizes the viscosity parameter of the asphalt binder to a specific range (3,000 to 10,000 cP at 15°C), which is higher than conventional asphalts. This increased viscosity provides better adhesion to aggregates, enhancing inter-aggregate coupling strength and preventing early damage while maintaining the drainage function
Solution Approach 2:
The rubberized asphalt composite material provides enhanced mechanical properties including improved elasticity and tensile strength. The rubber particles act as flexible binders that strengthen the bond between aggregates, increasing inter-aggregate coupling strength and resistance to early damage
3Ease of repair
If conventional drainage pavement is used, then drainage performance is provided, but repair costs are high and repair process is complex
Solution Approach 1:
The non-solidifying rubberized asphalt provides multiple functions simultaneously: it acts as a binder, waterproofing agent, and adhesive in a single material. This multi-functionality eliminates the need for separate intermediate layers and simplifies the pavement structure, making both construction and repair processes easier and more cost-effective while maintaining high durability
Solution Approach 2:
The non-solidifying property of the rubberized asphalt (maintained through controlled viscosity and softening point parameters) allows the material to remain workable and adhesive over extended periods. This enables easier repair operations without requiring complete removal and replacement of the pavement structure, reducing repair costs and complexity
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 effectively prevents water penetration, enhances durability, and maintains stability against load and impacts, extending the lifespan of the pavement while reducing repair costs and complexity.
Implementation Method 1
the non-solidifying rubberized asphalt in the paving material melts down and moves upwards from the bottom of the drainage pavement to firmly bind with the overlying layer
Implementation Method 2
applying a road pavement adhering to the underlying base layer to offer a waterproof performance, protect the base layer from penetration of water or moisture and prevent erosion of the road and adhering to the overlying surface layer
Data Source
AI summary
The present invention relates to a paving method of forming an intermediate layer, where a non-solidifying rubberized asphalt penetrates, on an asphalt mixture for base layer or a cement concrete to provide a permeable layer and an impermeable (intermediate) layer simultaneously with a single paving process for surface layer. The waterproofing and draining functions of the non-solidifying rubberized asphalt layer completely block water or moisture from penetrating into the underlying layer and protect the roads from damage due to freezing temperature with the moisture penetrating into the group in winter. The non-solidifying rubberized asphalt layer constituting the intermediate layer has the non-solidifying rubberized asphalt melt down and move upwards under the paving temperature and pressure applied during the paving process of forming a surface layer and firmly bind with the base layer, thereby completing an integrated pavement structure with enhanced water resistance and durability.