|February 2017 Newsletter|
Best Practices for Asphalt Overlays and Thin Lifts
Sarah Redohl – Asphalt Pro
When it comes to minor surface distress, sometimes the best option is to perform an overlay.
“Overlays have some distinct advantages compared to less costly surface maintenance treatments,” said Terry Humphrey, a training consultant at Caterpillar Paving Products, Peoria, Illinois. “In addition to sealing shallow fatigue cracks, overlays add strength to the existing structure and provide support for heavier loads with less chance of stress failures in the bottom layer of asphalt. Overlays can restore the proper transverse profile (slope) and improve longitudinal profile (smoothness).”
Overlays are an ideal tool to upgrade the existing pavement’s structure, as long as the increase in elevation doesn’t create a drainage or clearance issue, Humphrey said.
Failure to Act on Infrastructure Investment
The American Society of Civil Engineers (ASCE) has quantified the magnitude of the problem with its “Report Card for America’s Infrastructure,” which is issued every four years. Since 1998, America’s infrastructure has persistently received “D” averages. The failure to make sufficient investment to maintain and improve the infrastructure, though well identified, has been allowed to continue.
Now, ASCE has developed a series of reports that answer the key question: How does the failure to improve the condition of the infrastructure affect the nation’s future economic prosperity? The ASCE “Failure to Act” series, which began in 2011, has been recently updated with the report, “Failure to Act: Closing the Infrastructure Gap for America’s Economic Future.” The most-recent report details the economic impact of the current under-investment in infrastructure improvement.
In the report, ASCE predicts that between 2016 and 2025 inefficiencies caused by inadequate infrastructure will cost American families an average of $3,400 per year. During that same period, infrastructure needs will total $3.3 trillion, but planned investment is only $1.8 trillion. Closing the investment gap would cost every household $3 per day. The report can be found at http://www.asce.org/ failuretoact/.
Temperature, Temperature, Temperature
James A. Scherocman, P.E.
The purpose of this article is to discuss the importance of temperature, temperature and temperature on the ability of a contractor to obtain density in an asphalt concrete mixture when placed on the roadway. It is often stated, quite correctly, that density is the most important factor that affects the long-term performance of an asphalt pavement.
Minnesota weather is often variable with either extremely hot temperatures in the summer, rapidly cooling temperatures in the fall season to frigid cold temperatures in the winter. Fall seasons mean for nicer air temperatures for the paving crew to work in, it also means that the asphalt pavement mixture will cool more quickly. This results in more difficulty to compact and to obtain the desired level of density.
Back to Basics Webinar Series – National Asphalt Pavement Association (NAPA)
Producing quality asphalt pavement starts with a solid grasp of the basics. NAPA’s new Back to Basics webinar series helps you and your employees brush up on the fundamentals for success. Do you have a new employee who needs specialized training, or do you need to brush up on your fundamentals?
As the asphalt industry continues to advance both in technology and mix design methods, there are fundamental principles that remain the same and that should never be forgotten. The Back to Basics webinar series reinforces these fundamentals to ensure they are a part of your everyday operations.
Whether you need to learn how a drum plant operates or how to choose the right roller to ensure compaction, Back to Basics will remind you and your employees of the little things we do every day to ensure we produce quality asphalt mixtures and pavements.
PaveXpress 3.0 Launched
The latest update to PaveXpress, the free, Web-based pavement design tool, includes new modules for estimating material costs and conducting layered elastic analysis of a pavement structure. These new modules build on PaveXpress’s existing tools for designing new flexible and rigid pavements, as well as asphalt overlays for maintenance and rehabilitation. The update went live on Nov. 1 with an improved user experience, particularly on smaller screens, such as smartphones, Developed through the PEC, more than 15,000 people worldwide have registered as PaveXpress users since its launch in September 2014.
2016 NAPA Quality in Construction Awards Earned by Minnesota ContractorsNAPA’s Quality in Construction Awards Program recognizes pavements constructed in sustainable and/or innovative ways. Each pavement has to qualify for an award in the Quality in Construction categories — Airport Pavements, General Pavements (under 50,000 tons), or Highway Pavements (over 50,000 tons). An optional section on the nomination form allows applicants to highlight the adaptability and sustainability of the asphalt used on the project. The Green Award is earned by contractors for their use of sustainable practices in the construction of an asphalt pavement.
Video of the Month: Drivability Is What Matters
Asphalt pavements are the best solution when you want high performance. They are smooth, quiet, and safe. They can reduce noise at the point where the tire meets the road, and they are quick and easy to construct and maintain.
61st Annual MN Asphalt Construction & Quality WorkshopThis workshop is a technology exchange of new developments and strategies for asphalt pavements. This year the topics are focused on the 2017 Legislative Session, MnDOT Funding, MnROAD/NRRA, State Aid/Local Asphalt Projects, MnDOT Specs 101, Safety, Material Uniformity at the Paving Train, Life Cycle Cost for Pavement Overlays, Thinlay, Performance Testing and Intelligent Compaction/Infrared Thermal Bar. Personal Development Hours (PDH’s) will be available for attendees at this workshop.
Wednesday, March 29, 2017
Earle Brown Heritage Center, 6155 Earle Brown Drive in Brooklyn Center, MN
Fee Reduced to $100/regsitration