Bituminous Additive with Graphene and PVB for Pavement Strength
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Solution Overview
Problem
Existing bituminous conglomerate additives fail to simultaneously enhance mechanical properties and reduce environmental impact by minimizing raw material usage and carbon footprint.
Innovation Solution
A composition combining recycled or virgin thermoplastic polymers, polyvinylbutyral, and graphene, specifically a mixture of polyethylene and polypropylene with polyvinylbutyral and graphene, added to bituminous conglomerates to improve mechanical properties and reduce environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional additives comprising thermoplastic polymers and plasticizers are used to improve mechanical properties of bituminous conglomerates, then tensile strength and crack resistance are enhanced, but environmental impact increases due to use of non-recycled materials and harmful plasticizers
Solution Approach 1:
The invention changes the chemical composition parameters by eliminating harmful plasticizers (dioctylphthalate) and using environmentally friendly alternatives (polyethylene glycol, vegetable oils). It also changes the source of polymers from virgin to recycled materials, transforming the additive from environmentally harmful to sustainable while maintaining mechanical performance improvements in bituminous conglomerates
Solution Approach 2:
The invention creates a composite additive system combining recycled thermoplastic polymers (polyethylene, polypropylene) with natural plasticizers (polyethylene glycol, vegetable oils) and optional reinforcing agents (graphite, carbon black). This composite approach achieves both mechanical property enhancement and environmental sustainability by synergistically combining multiple recycled and natural components
2Object-affected harmful factors
If recycled thermoplastic polymers are used in the additive composition, then environmental sustainability is improved, but mechanical performance enhancement may be compromised
Solution Approach 1:
The invention changes the physical and chemical parameters of recycled polymers through controlled granulation (0.5-5mm size) and blending with plasticizers. This processing transforms recycled materials with potentially degraded properties into an effective additive that restores and enhances mechanical performance while maintaining environmental benefits
Solution Approach 2:
The invention uses plasticizers (polyethylene glycol, vegetable oils) as intermediary substances that mediate between recycled thermoplastic polymers and bitumen. These intermediaries improve compatibility, dispersion, and bonding, ensuring that recycled polymers effectively enhance mechanical performance without compromising sustainability
3Reliability
If the additive composition comprises multiple components (thermoplastic polymers, polyvinylbutyral, graphene), then mechanical properties and fatigue resistance are significantly improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges multiple functional components (recycled thermoplastic polymers, polyvinylbutyral, graphene) into a single integrated additive composition. This combined approach achieves synergistic effects where each component contributes specific properties (polymer provides base structure, PVB enhances adhesion, graphene improves fatigue resistance) while the overall manufacturing process remains simple through direct mixing and granulation
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 additive composition significantly increases tensile strength, stiffness, and fatigue resistance, reducing the rutting phenomenon and extending the service life of road pavements while minimizing material usage and emissions.
Implementation Method 1
The additive composition comprises... graphene... The additive composition significantly increases tensile strength, stiffness, and fatigue resistance
Implementation Method 2
such additives can be compositions comprising thermoplastic polymers for improving the mechanical properties of the bituminous asphalt containing such additives, in particular the breaking strength and resistance to cracks formation
Implementation Method 3
a polymeric compound selected from the group consisting of polyvinylbutyral (PVB)... suitable for improving the mechanical properties of said bituminous conglomerate
Data Source
AI summary
Additive composition intended to be mixed into bituminous conglomerates for road paving, comprising a thermoplastic polymer, a polymeric compound selected from the group consisting of polyvinylbutyral (PVB), polyethylacrylate (PEA) polymethylacrylate (PMA), polybutylacrilate (PBA), lignin and mixtures thereof, and graphene, preferably wherein the graphene is contained in quantity between 0.005 and 1% by weight based on the total weight of the composition; it is also described a bituminous conglomerate suitable for making a road paving, comprising aggregates, filler, bitumen and said additive.