Viscoelastic Warm-Mix Asphalt Modifier for Rutting and Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing asphalt pavements face issues with premature damage due to inadequate viscosity and elasticity, leading to rutting and cracking, and current polymer modifiers either lack sufficient viscosity or exhibit brittleness, which shortens the pavement life cycle and increases maintenance costs.
Innovation Solution
The use of highly viscoelastic warm mix modifiers composed of a combination of strongly viscous and highly elastic polymers, along with crack-resistant warm mix additives, to enhance the viscoelastic properties of asphalt binders, allowing for improved performance in extreme weather conditions and extended pavement life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymer modifiers are added to improve elasticity and resist cracking, then crack resistance is improved, but viscosity is insufficient leading to rutting
Solution Approach 1:
The patent uses composite polymer modifiers combining SBS (styrene-butadiene-styrene) for elasticity and crumb rubber for viscosity enhancement. This composite approach allows the modifier to simultaneously provide crack resistance through elastic properties and rut resistance through increased viscosity, resolving the contradiction between these two performance requirements.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the polymer modifier by using crumb rubber particles with specific size ranges (0.5-5mm) and optimizing the SBS-to-crumb-rubber ratio. These parameter changes enable the modifier to achieve both high elasticity for crack resistance and sufficient viscosity to prevent rutting under heavy traffic loading.
2Productivity
If high heating temperature is used to produce modified asphalt concrete, then mixing efficiency is improved, but energy consumption and environmental pollution increase
Solution Approach 1:
The patent changes the temperature parameter from conventional high-temperature mixing (160-170°C) to medium-temperature mixing (120-140°C) by optimizing the polymer modifier composition. The SBS-crumb rubber composite modifier maintains effective coating and mixing efficiency at the lower temperature, thereby reducing energy consumption and environmental pollution while preserving productivity.
3Duration of action of stationary object
If polymer modifiers are added to extend pavement life cycle, then durability is improved, but production cost increases
Solution Approach 1:
The patent incorporates crumb rubber, a waste material from tire recycling, as a cost-effective component in the polymer modifier. This use of inexpensive recycled material extends pavement life cycle through enhanced elasticity and crack resistance while keeping production costs low, as crumb rubber is significantly cheaper than virgin polymer materials.
Solution Approach 2:
The patent recovers and utilizes crumb rubber from discarded tires to create a valuable polymer modifier component. This recovery process transforms waste material into a functional additive that extends pavement durability, simultaneously addressing environmental concerns and reducing production costs by substituting expensive virgin polymers with recycled content.
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 increases the durability and lifespan of asphalt pavements by providing both strong viscosity and high elasticity, reducing rutting and cracking, and lowering production temperatures, thus reducing environmental impact and construction costs.
Implementation Method 1
highly viscoelastic warm mix modifiers composed of a combination of strongly viscous and highly elastic polymers
Implementation Method 2
The use of highly viscoelastic warm mix modifiers composed of a combination of strongly viscous and highly elastic polymers, along with crack-resistant warm mix additives, to enhance the viscoelastic properties of asphalt binders
Implementation Method 3
either high heating (160-170° C., hot mix asphalt) or medium heating (120-140° C., warm mix asphalt) production method exists
Implementation Method 4
Asphalt binders showing comparatively less molecular weight inherently possess considerably inferior physical properties compared to polymers having a high molecular weight
Data Source
AI summary
The first priority of this invention is to provide the composition and the manufacturing method of a novel highly visco-elastic warm-mix modifier that can be added to asphalt binders for the purpose of reducing environmental pollution, saving natural resources by recycling RAP aggregates, reducing construction cost, and minimizing maintenance cost by extending pavement life-cycle. The highly visco-elastic warm-mix modifier may be manufactured by adding highly viscous and general purpose polymers to elastic polymers in the warm mix modifier. Warm mix additives, including waxes, oils and elastic materials, may also be introduced to the highly visco-elastic warm-mix modifier. In more details, the invention is characterized to manufacture the novel modified recycled (or regular) warm-mix asphalt concrete mixture by heating and mixing 0.5-20 weight parts of the highly visco-elastic warm-mix modifier.