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FHWA 'Asphalt Pavement Principles' YouTube Series
The new "Asphalt Pavement Principles" online video series from the Federal Highway Administration highlights the innovation and collaboration that go into modern asphalt pavements. Developed with the cooperation of the National Asphalt Pavement Association (NAPA), the videos feature engineers, academics, and other industry figures discussing best practices for pavement performance.
"These videos help agencies and paving contractors alike better understand how to design and build asphalt pavements in a way that improves pavement performance and service life," said NAPA 2019 Chairman John Harper, Senior Vice President at Construction Partners Inc. in Dothan, Alabama. "Attention to best practices and applying innovative technologies and materials are an important part of ensuring the traveling public gets the highest level of performance that asphalt pavements can deliver."
Guidelines for RAS Use Publication Updated
Every year, about 13.2 million tons of asphalt roofing shingle waste is generated across the United States. This asphalt-rich material does not have to end up in landfills. Instead, the asphalt binder, aggregates, and fibers in waste shingles can be successfully put to use in new roads, parking lots, and other asphalt pavements. To aid in the further use of waste asphalt shingles in asphalt pavements, the National Asphalt Pavement Association (NAPA) has released an updated second edition of Guidelines for the Use of Reclaimed Asphalt Shingles in Asphalt Pavements (IS 136)
The publication covers sourcing of waste roofing shingles, inspection for contaminants, shingle processing, mixture design guidance, binder adjustments, and production and construction considerations. It also includes information on the sustainability and economic benefits of recycling asphalt shingles.
Thinlays for Pavement Preservation
Thinlays™, a suite of thin-asphalt overlays designed specifically for pavement preservation, provide road owners with a cost-effective way to preserve pavement life, correct minor distresses, and improve the performance and life of a road. With Thinlays, agencies can extend the life of pavements that are in good to fair condition, decreasing life-cycle costs, improving ride, and decreasing roadway noise.
Thinlays for Pavement Preservation provides comprehensive guidance on the proper use of Thinlays, including how they fit within pavement management systems, when and how they should be used, how to develop and specify Thinlay mixes, and best practices for Thinlay construction. It also helps users compare the cost and performance of common pavement preservation techniques.
Structural Design Guide for Porous Asphalt
Commonly used for parking lots and other light-duty applications, full-depth porous asphalt pavements are increasingly being used on roadways as part of efforts to mitigate flooding hazards, reduce hardscape, and improve sustainability. To help ensure these new porous asphalt roadways provide reliable performance under traffic, NAPA has published Structural Design Guidelines for Porous Asphalt Pavements.
Written by Charles W. Schwartz, Ph.D., and Kevin D. Hall, Ph.D., P.E., with the support of the NAPA–SAPA Pavement Economics Committee's Pavement Design Task Group, Structural Design Guidelines for Porous Asphalt Pavements discusses the structural design procedure for porous asphalt and the required inputs using the AASHTO 93 design method.