Use of Recycled Asphalt Shingles (RAS) in an Asphalt Mix as a Compaction Aid

Unmet Need:  Innovative methods for incorporating waste materials into durable asphalt pavement

Asphalt paving offers the opportunity to recycle waste materials that otherwise end up in landfills. This method can reduce the need to produce costly virgin component materials with a significant environmental footprint. Using too much recycled material can also reduce the performance of paved surfaces, causing issues like increased air voids or decreased elasticity, which lead to premature deterioration.

Many factors can affect the compaction of an asphalt mix, including field conditions, compaction method, aggregate gradations and properties, and asphalt binder amount and properties. Among these factors, the binder content greatly affects the compactibility of an asphalt mix. Thus, seeking continuous and effective methods to achieve optimal compaction is important.  Researchers at WSU have proposed a novel approach that uses RAS as a compaction additive in asphalt mixtures, extending pavement life and promoting more widespread and effective use of RAS.

The Technology: Incorporating waste-recycled asphalt shingles and waste plastics in new asphalt mixes enhancing the durability of asphalt paving

Mixing Recycled asphalt shingle with new asphalt can potentially decrease the use of virgin binder and construction costs, while also reducing RAS disposal and protecting the environment. Achieving adequate compaction density during asphalt mix construction is crucial for optimal pavement performance. WSU researchers identified a novel approach that utilizes RAS as a compaction additive in asphalt mixes. Additionally, incorporating Polyethylene (PE) flakes into asphalt mixtures using a dry process can help achieve good compaction of asphalt mixture and thus extend pavement life, as well as enable large-quantity use of waste plastics.

Researchers identified that the use of RAS as compaction aid did not adversely affect the laboratory cracking and rutting performances and enhanced the compactibility of the mix. Additionally, RAS improved the compactibility of the mix, making it easier to achieve the desired density and quality during construction.

Applications:

• Facilitate compaction under difficult site conditions
• Contributes sustainable construction and waste management practices
• Enhances the durability and longevity of the road surfaces
• Minimize the need for new materials, reducing overall project costs

Advantages:

• A cost-effective approach for contractors to achieve project performance goals and in-turn qualify for incentives.
• Reduce landfill waste and promote recycling
• Reduce costs and benefits resource conservation

Patent Information:

A provisional patent application has been filed.

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