Hybrid-Treated Plastic Granules for Asphalt Binder Compatibility
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Solution Overview
Problem
Plastic waste, particularly non-recycled plastics, poses significant environmental challenges due to its long lifespan and inadequate recycling rates, leading to landfills and incineration, and lacks effective methods for resource conservation and performance enhancement in construction materials.
Innovation Solution
Treating waste plastic granules with bio-oil and a carbon coating, such as graphene nanoparticles, to compatibilize them with asphalt or concrete binders, enhancing surface energy and interactions, thereby improving pavement performance and reducing separation tendencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waste plastic granules are used in construction materials, then resource conservation is promoted, but compatibility with asphalt binder is poor leading to phase separation
Solution Approach 1:
The patent introduces a surface treatment layer comprising silane-modified polyethylene terephthalate and a silane coupling agent as an intermediary between the waste plastic granules and the asphalt binder. This treatment layer acts as a compatibilizer that improves interfacial adhesion, reduces phase separation, and enhances the overall compatibility between the plastic granules and binder system.
Solution Approach 2:
The patent creates a composite structure by coating waste plastic granules with a surface treatment layer that combines silane-modified PET and silane coupling agent. This composite approach integrates multiple functional components to simultaneously improve compatibility, reduce phase separation, and enhance mechanical properties of the final construction material.
2Object-affected harmful factors
If waste plastic granules are used to replace aggregates, then environmental impact is reduced, but strength and durability of pavement are insufficient
Solution Approach 1:
The surface treatment layer comprising silane-modified PET and silane coupling agent serves as an intermediary that transfers and distributes mechanical stresses uniformly throughout the pavement structure. This reduces stress concentration at the interface between plastic granules and binder, thereby improving overall strength and durability while maintaining the environmental benefits of using waste plastic.
Solution Approach 2:
The patent modifies the surface properties of waste plastic granules through chemical treatment, changing parameters such as surface energy, surface area, and chemical composition. These parameter changes enhance the mechanical interlocking and adhesion between plastic granules and binder, resulting in improved strength and durability without compromising the environmental advantages.
3Ease of manufacture
If untreated plastic granules are used in binder, then manufacturing simplicity is maintained, but viscosity and low-temperature properties deteriorate
Solution Approach 1:
The patent applies surface treatment to the plastic granules before incorporating them into the binder mixture. This preliminary action of coating the granule surface with silane-modified PET and silane coupling agent ensures that the improved viscosity and low-temperature properties are achieved without adding complex processing steps during the actual binder manufacturing process.
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 treated plastic granules demonstrate increased surface energy, reduced phase separation, improved viscosity, and enhanced resistance to fatigue cracking, resulting in better performance of construction materials while diverting waste from landfills.
Implementation Method 1
irradiating the mixture with microwave radiation to yield oil-treated plastic particles
Implementation Method 2
contacting the oil-treated plastic particles with carbon-containing nanoparticles to yield hybrid-treated plastic particles
Data Source
AI summary
Preparing hybrid-treated plastic particles from waste plastic includes combining waste plastic particles with bio-oil to yield a mixture, irradiating the mixture with microwave radiation to yield oil-treated plastic particles, and contacting the oil-treated plastic particles with carbon-containing nanoparticles to yield hybrid-treated plastic particles. The hybrid-treated plastic particles have a bio-oil modified surface and a coating comprising carbon-containing nanoparticles on the bio-oil modified surface of the plastic particle. In some examples, a diameter of the plastic particle is in a range between 250 μm and 750 μm, and a thickness of the coating is in a range of 1 nm to 20 nm. A modified binder includes an asphalt binder or a concrete binder and a multiplicity of the treated plastic particles. The modified binder typically includes 5 wt % to 25 wt % of the hybrid-treated plastic particles.