Asphalt Binder Additives for Recycled Content
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Solution Overview
Problem
The reuse of reclaimed asphalt materials in paving and roofing is limited due to the stiffness of aged asphalt binders, which can lead to cracking and moisture damage in asphalt mixtures, and existing solutions fail to effectively incorporate higher contents of recycled materials without compromising durability.
Innovation Solution
The development of asphalt binder additive compositions comprising a carrier matrix and a curing or masked curing agent, which rejuvenate recycled asphalt binders, reducing the stiffness of the binder and allowing for increased recycled content in asphalt mixtures, improving mechanical properties and workability, and enabling the production of warm mix asphalt at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If higher content of reclaimed asphalt pavement (RAP) or recycled asphalt shingle (RAS) is incorporated into new asphalt mixtures, then the demand for natural resources is reduced and material reuse is increased, but the stiffness of the asphalt mixture increases and susceptibility to cracking and moisture damage increases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and physical properties of the aged asphalt binder through the addition of rejuvenating agents. These agents alter the stiffness parameter of the binder, transforming it from a harmful property (excessive stiffness) to a beneficial range, thereby enabling higher RAP/RAS content while maintaining mixture reliability
Solution Approach 2:
The patent uses rejuvenating agents as intermediary substances that mediate between the stiff aged binder and the desired flexible mixture properties. These agents act as chemical intermediaries that react with or blend with the aged binder to restore its workability and reduce stiffness without compromising the structural integrity provided by the recycled materials
2Strength
If a softer binder is used to mitigate stiffness increase from RAP/MSW/PCAS, then the stiffness problem is partially addressed, but incomplete blending occurs and the mixture remains susceptible to cracking, moisture damage, or rutting
Solution Approach 1:
The patent employs composite materials by creating a blended binder system that combines softer virgin binder with rejuvenating agents in specific proportions. This composite approach ensures complete blending and uniform distribution of properties throughout the mixture, achieving both stiffness control and reliability by leveraging the synergistic effects of multiple components
3Adaptability or versatility
If higher RAP or RAS content is used to reduce material burden, then sustainability is improved, but the asphalt mixture becomes high in stiffness and may fail in the field
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the chemical and physical parameters of the binder through rejuvenating agents. This enables the mixture to maintain optimal workability parameters even at high RAP/RAS content, resolving the contradiction between sustainability and ease of operation
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 compositions enhance the mechanical, aging, and wear properties of asphalt mixtures, allowing for higher recycled content, improved workability, and reduced production temperatures, thereby extending the life of asphalt surfaces and reducing environmental impact.
Implementation Method 1
an agent selected from the group consisting of a curing agent and a masked curing agent
Data Source
AI summary
The present application discloses compositions and methods for improving or enhancing the paving or re-paving of asphalt to road surfaces comprising the addition of the composition to the asphalt.