Sprayable Asphalt Coating Enhances Surface Friction
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Solution Overview
Problem
Existing asphalt spray coatings for roads and parking lots have a smoother micro-texture than the underlying pavement, resulting in reduced frictional resistance, making them unsuitable for high-speed vehicle traffic, and there is a lack of effective means to increase micro-texture roughness and surface friction.
Innovation Solution
A sprayable asphalt and aggregate coating composition using a fine, low bulk density aggregate material suspended in a cationic asphalt emulsion, which provides increased surface micro-texture roughness and durability, allowing for application using conventional equipment and maintaining performance over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional asphalt spray coatings are applied to seal and protect pavement surfaces, then water intrusion is sealed and appearance is improved, but surface micro-texture becomes smoother and frictional resistance is significantly reduced
Solution Approach 1:
The patent combines asphalt emulsion with fine aggregate particles to create a composite sprayable coating composition. The aggregate particles (sand, silica, or other fine materials) are suspended in the asphalt emulsion, creating a composite material that provides both sealing protection and enhanced surface friction through the rough texture of the embedded particles.
Solution Approach 2:
The patent modifies the surface properties locally by incorporating fine aggregate particles specifically at the coating surface. These particles create localized roughness and friction enhancement exactly where needed for vehicle traction, while the underlying asphalt emulsion provides the sealing and protective functions.
2Object-generated harmful factors
If aggregate material is added to increase surface friction, then frictional resistance is improved, but the coating becomes harder to spray and apply with conventional equipment
Solution Approach 1:
The patent changes the particle size parameter of the aggregate material, specifying fine particles with a D50 (median diameter) between 0.06mm and 0.15mm. This size reduction allows the aggregate to be suspended in the emulsion and sprayed through conventional equipment nozzles, while still providing effective surface friction enhancement when applied.
Solution Approach 2:
The patent uses fine aggregate particles that are specifically sized to provide the necessary friction enhancement while maintaining sprayability. The fine particle size allows uniform distribution and suspension in the emulsion, enabling easy application with conventional spray equipment, while the particles themselves provide the local roughness needed for friction.
3Object-generated harmful factors
If fine aggregate particles are used to enhance friction, then surface micro-texture roughness is increased, but the coating viscosity and handling properties may be affected
Solution Approach 1:
The patent optimizes the concentration parameter of aggregate particles in the coating composition, specifying a range of 5-20% by weight. This controlled concentration provides sufficient surface roughness and friction enhancement while maintaining appropriate viscosity for spray application and proper handling during storage and transport.
Solution Approach 2:
The patent uses fine aggregate particles that provide surface roughness primarily at the coating layer rather than throughout the bulk material. This localized roughness enhancement minimizes the impact on overall coating viscosity and handling properties, as the fine particles are distributed throughout the emulsion but primarily affect surface characteristics.
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 composition significantly enhances surface micro-texture roughness, restoring and exceeding the original frictional resistance of the pavement, enabling its use on high-speed roads and maintaining durability and other benefits of a superior seal coating.
Implementation Method 1
A sprayable asphalt and aggregate coating composition using a fine, low bulk density aggregate material suspended in a cationic asphalt emulsion
Data Source
AI summary
A sprayable coating composition, and method of application, for coating asphalt paving surfaces. In the coating composition, a low bulk density aggregate material of sprayable particle size is suspended in a sprayable asphalt emulsion in an amount sufficient to increase the micro-texture surface roughness of the cured coating.