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ePublications

MnROAD Cracking Group Experiment: Validation of Low-Temperature Cracking Tests for Balanced Mix Design

In 2014-2015, the Minnesota Road Research Facility (MnROAD) and the National Center for Asphalt Technology (NCAT) developed an experimental plan ...

Evaluation of IDEAL-CT Testing Equipment

The IDEAL-CT has become a popular cracking test in the asphalt industry. Many sources of variability in the IDEAL-CT testing results have been studied ...

In-Service Performance of Airport Flexible Pavements Constructed Following State Specifications for Highway Pavement Materials

Flexible pavements consisting of asphalt mixtures and granular bases are commonly used on airfields and highways. Although there are many similarities ...

Novel Methods for Adding Rejuvenators in Asphalt Mixtures with High Recycled Binder Ratios

The overall objective of this study was to explore three novel rejuvenator application methods using the emulsion and foaming technologies and determine ...

LCCA Elements: Recommendation for Discount Rate

The missions of transportation agencies across the United States are inextricably connected to the welfare of the people in the communities they serve. Many will find this statement unsurprising ...

Phase VII (2018-2021) NCAT Test Track Findings

The National Center for Asphalt Technology (NCAT) Test Track is a successful pavement proving ground originally constructed in 2000. The 1.7-mile oval track is a unique accelerated pavement testing ...

NCAT Performance Testing Round Robin

A round robin study was conducted by the National Center for Asphalt Technology (NCAT) to assist with the implementation of mixture performance testing for balanced mix design (BMD) efforts ...

Implementation Spotlight: Paving Thick Lifts for Deep Rapid Rebuilds

Research has shown that the minimum thickness of a plant-mix asphalt paving lift should be three times the nominal maximum aggregate size (NMAS) of the aggregate blend for fine-graded mixtures ...

Effect of Pavement Roughness on User Costs
After the construction of a pavement system, deterioration occurs because of traffic loading and weathering action and results in the formation of various types of distresses ...
Using Existing Pavement in Place and Achieving Long Life
America’s highway system is critical to meeting the mobility and economic needs of local communities, regions, and the nation. Developments in research and technology—such as advanced ...
Influence of Asphalt Pavement Characteristics on Vehicular Rolling Resistance
Rolling resistance is typically considered to be the longitudinal force resisting a vehicle’s tires as they roll across the pavement surface ...
Benefits of Rehabilitating Concrete Pavements with Slab Fracturing and Asphalt Overlays
The benefits of using asphalt overlays for rehabilitation of Portland cement concrete (PCC) pavements are grounded in economics and long-term ...
Phase IV (2015-2017) NCAT Test Track Findings Report Available
Six cycles of research have now been completed at the NCAT Test Track, and the findings have helped sponsors refine their materials specifications, construction practices and pavement design procedures for asphalt pavements ...
Recalibration Procedures For The Structural Asphalt Layer Coefficient In The 1993 AASHTO Pavement Design Guide
Pavement thickness design in the U.S. has been predominantly empirically‐based since the 1960’s.  The American Association of State Highway and Transportation Officials (AASHTO) pavement design guides published from ...
Material Selection Guidance for Asphalt Pavement Design
Over the years, the asphalt industry has developed and quickly adopted a number of innovative and sustainable materials and technologies (hereinafter referred to as materials) for use in flexible pavements. While sustainability is a broadly-used term ...
Best Practices for Determining Life Cycle Costs of Asphalt Pavements
State highway agencies (SHAs) continually face important financial decisions when planning a new or reconstructed highway. For example, what is the initial investment for the highway? How much is needed periodically to maintain the highway ...