Particulate Bitumen Joint Filler for Pavement
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Solution Overview
Problem
Existing joint materials for pavement blocks, such as gravel and cement-based materials, lack the necessary strength, flexibility, and water resistance for heavily trafficked areas, and bitumen-based solutions require labor-intensive heating and can be messy and risky when applied in liquid form.
Innovation Solution
A method for preparing a particulate joint filler using an elastoplastic bitumen-based material that becomes sticky between 0°C and 40°C, allowing particles to be cooled and stored at a low temperature to prevent fusion, then heated to adhere to adjacent surfaces, forming a homogeneous mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bitumen-based material is used in liquid form for joint filling, then strong and flexible joints are achieved, but labor-intensive heating and messy application are required
Solution Approach 1:
The invention changes the temperature parameter of the bitumen-based material from liquid state (requiring heating to 120-140°C) to solid particulate state at ambient temperature. The particles are designed to melt and flow only when heated during application, transforming the material's physical state from liquid (difficult to handle) to solid particles (easy to apply) and back to liquid (for bonding) at the application stage.
Solution Approach 2:
The invention uses short-living heated state during application - the particles are heated temporarily just long enough to melt and fill the joints, then cool and solidify. This avoids the need for continuous heating infrastructure and reduces safety risks associated with prolonged handling of hot liquid bitumen.
2Ease of manufacture
If liquid bitumen is heated to flowing state for application, then joints can be filled, but fire danger and safety risks increase
Solution Approach 1:
The bitumen-based material is prepared in advance as solid particles with controlled melting properties. Instead of heating large quantities of liquid bitumen during application (creating fire hazards), the pre-formed particles are simply heated in situ to their melting point, significantly reducing the volume of material in liquid state and thus minimizing fire danger.
Solution Approach 2:
The invention replaces the traditional mechanical heating system (heating tanks, pumps, and distribution of hot liquid) with a simpler thermal treatment of solid particles. The particles are heated directly in the joints or in containers just before application, eliminating the need for complex heated delivery systems and reducing fire risks associated with large volumes of hot liquid.
3Strength
If cement-based materials are used for joint filling, then joints gain strength, but flexibility and water resistance are insufficient
Solution Approach 1:
The invention uses composite bitumen-based material that combines the adhesive properties of bitumen with reinforcing aggregates or modifiers. This composite structure provides both the strength needed for traffic areas and the flexibility required for thermal expansion and contraction, while the bitumen matrix ensures water resistance by creating a continuous waterproof barrier that cement-based materials cannot provide.
4Stability of the object's composition
If particulate joint filler is stored at ambient temperature, then particles may fuse together, but storage and handling become difficult
Solution Approach 1:
The invention controls the temperature parameter during storage to maintain particles in a stable solid state. By storing particles at temperatures below their melting point but above the Fraas breaking point, the material remains stable and free-flowing without fusing, enabling easy handling and application while preventing premature bonding.
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 method provides a strong, flexible, and water-resistant joint filler that can be easily applied without the labor and safety hazards of heating liquid bitumen, ensuring stable and durable joints in traffic areas.
Implementation Method 1
the adhesive properties of the joint filler particles are then activated so that the material particles gradually melts to a homogenous mass
Implementation Method 2
the particles are then heated. Thereby the particles adhere to each other and to adjacent surfaces
Implementation Method 3
to cool the separated particles to a solid phase; and to store the particles at a first temperature sufficiently low to hinder fusion melting
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Method for preparation of a particulate joint filler comprising at least an elastoplastic binder (11 ), adapted to be used for shaping of a joint sealing or continuous cover, distinctive in that the method comprises the steps: to shape particles (1, 1 ',1 ") from a bitumen based material by separating the particles (1,1 ',1 ") from a viscous phase of the bitumen based material; to cool the separated particles (1,1 ',1 ") to a solid phase; and to store the particles at a first temperature sufficiently low to hinder fusion melting of the particles (1,1 ",1 "). Method of preparing a joint seal using the joint filler material. Particulate joint filler material for use with the method.