Rubber-modified asphalt is a proven circular solution for used tires that saves money, extends pavement life and reduces noise.
more research needed to fill data gaps
WASHINGTON – July 22, 2021 – The US Tire Manufacturers Association (USTMA), in partnership with the University of Missouri and The Ray, a nonprofit proving ground for sustainable transportation technologies, today released a state of knowledge who evaluated existing research on the economic, performance and environmental benefits of using ground tire rubber (RPG) in asphalt. The report finds that rubber-modified asphalt is a resilient pavement solution for rebuilding American roads and a promising, sustainable and circular end-of-life market for used tires. The report also provides recommendations for further research to ensure a comprehensive understanding of the impact of the technology.
Developing sustainable end-use markets for the 260 million used tires generated each year in the United States is a top industry priority. Rubber-modified asphalt, which incorporates crushed tire rubber made from used tires into asphalt, offers proven economic, performance and environmental benefits. Compared to traditional asphalt, rubber-modified asphalt saves asphalt life, extends pavement life, and reduces noise, CO2 emissions and wear particles. tires and the road. Rubber-modified asphalt also results in lower rolling resistance, which helps improve fuel economy.
Dr Bill Buttlar, director of the Missouri Center for Transportation Innovation and the report’s principal investigator, worked to answer a critical question: Can rubber-modified asphalt help clear the inventory of used tires in the United States, increase the durability and longevity of the pavement and allow more kilometers of roads to be repaired?
“This research provides those who make infrastructure decisions – road operators, state and federal regulators and legislators, contractors and researchers in pavement and road construction – with important information about efficiency and effectiveness. environmental impact of rubber-modified asphalt, ”said Dr Buttlar. “It explains why states should review and expand asphalt specifications to incorporate this proven alternative. We must continue to research rubber-modified asphalt to better understand the full picture of the environmental impacts and benefits of this pavement.
“The report demonstrates the value of recycling tires on better performing roads that will help states save money over the life of the pavement and make our roads quieter, ”said Allie Kelly, executive director of The Ray. “Our work with USTMA and the University of Missouri shows how we can work together to find safe and sustainable solutions. The opportunity to expand and expand the use of rubber-modified asphalt in all 50 states has arrived, with congressional action on transportation and infrastructure funding, and the publication of this inventory of the best research and RMA analyzes.
“Review of research from the University of Missouri proves that rubber-modified asphalt is a strong and viable application for advancing the durability and circularity of used tires, ”said Anne Forristall Luke, president and chief executive officer. direction of USTMA. “To help develop this market in a safe and responsible manner, USTMA supports infrastructure legislation increase opportunities for university and government research, regional innovation hubs for rubber-modified asphalt, and federal purchases of rubber-modified asphalt. We also advocate that states and municipal communities consider expanding asphalt specifications to include rubber modified asphalt as a possible coating choice.
Equally important, the state-of-the-knowledge report identified data gaps that should be filled to better inform modern pavement design software, including the need for further research on the impact of the lifecycle of the pavement. rubber modified asphalt and its properties and characteristics.
the research has been peer– reviewed by a technical advisory committee regulators, researchers and scientists who provided support, ideas and comments. The study examined more than 300 researchers articles and reports and interviewed 26 state road agencies to identify knowledge gaps and barriers to more widespread adoption of rubber-modified asphalt nationwide.
USTMA, Ray and University of Missouri will discuss report findings in a online seminar today at 11:00 a.m. EST. RSVP at the July 22 webinar to learn more.