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June 2017 Paving Progress Newsletter

Topics Include:

  • Perpetual Pavement Award Section on I-35 Continues Long Life
  • Software Update Helps Ensure Long Life of Pavements
  • Cold In-Place Recycling Presentation & Project Visit
  • Balanced Mix Design for Asphalt Mixtures
  • Thinlay Projects On The Ground in Ohio
  • 2018 Specification Updates
  • National Road Research Alliance (NRRA) Pavement Workshop
  • Benefits of Asphalt Parking Lots
  • NACE Awards in MN
  • Lee Gustafson, P.E. Named One of Top Ten APWA Leaders in 2017
  • Calendar of Events

 

Perpetual Pavement Award Section on I-35 Continues Long Life

Brandon Brever, P.E. (MAPA) – In 2002 a section of I-35 was awarded a national Perpetual Pavement Award. This summer the same section of Interstate 35 from Willow River to Scanlon is undergoing full depth reclamation for nine miles on the north and southbound lanes to continue as a long life pavement. The section has been in service for 50 years from initial base construction followed by mill & overlays. Various innovative technology and construction techniques were used on this project to provide a long-lasting asphalt pavement for the traveling public.

Click here to read the full article

 

Software Update Helps Ensure Long Life of Pavements

The 4.3 version of PerRoad Perpetual Pavement design software has been released. Developed at Auburn University, PerRoad uses the mechanistic-empirical design philosophy to estimate stresses and strains that would prove detrimental for fatigue cracking or structural rutting.

PerRoad Version 4.3 incorporates recent research conducted on the Pavement Test Track at the National Center for Asphalt Technology at Auburn University and then validated with live traffic on Perpetual Pavement sections. The new features allow PerRoad to perform a conventional mechanistic-empirical (M-E) design to directly compare against Perpetual Pavement designs. It can also use strain distribution or a single endurance limit strain value to design a Perpetual Pavement.

“Perpetual Pavement designs allow us to limit distresses to the easily repaired surface,” stated David Timm, Ph.D., P.E., developer of PerRoad. “By coupling layered elastic analysis with a statistical analysis procedure, PerRoad helps a designer understand the layer thicknesses and other values that will ensure a long-life asphalt pavement.”

PerRoad is available for free at www.asphaltroads.org/perroad

Cold In-Place Recycling Presentation & Project Visit

On June 23rd Midstate Reclamation and Trucking hosted a presentation in Taylors Falls followed by a project visit to a nearby Cold-in-place Recycle (CIR) operation. CIR uses a train of equipment to mill, crush, inject additives, pave, and compact the mix. Once the existing old pavement is milled and crushed, additives are injected into the cold mix. Emulsion and foamed PG graded binder are commonly used additives in the process. Other modifiers are: portland cement, Quicklime/hydrated lime, lime slurry, and add rock.

CIR is a tool to be used at the right place and at the right time. Project selection is important in this process. The base needs to be structurally sound with adequate drainage. Coring, GPR, construction records and mix design should all be used in the selection process to determine if CIR is the correct choice. The depth of CIR is typically 3 to 4 inches but can also be done at 4 to 5 inches.

Click here to view the presentation

Balanced Mix Design for Asphalt Mixtures

Reprinted with permission from National Center for Asphalt Technology (NCAT) – In September 2015, the FHWA Expert Task Group on Mixtures and Construction formed a Balanced Mix Design Task Force. This group defined balanced mix design (BMD) as “asphalt mix design using performance tests on appropriately conditioned specimens that address multiple modes of distress taking into consideration mix aging, traffic, climate and location within the pavement structure.” In short, BMD incorporates two or more mechanical tests such a rutting test and a cracking test to assess how well the mixture resists common forms of distress. The Task Force identified three potential approaches to the use of BMD: volumetric design with performance verification, performance-modified volumetric mix design, and performance design.

Click here to read more.

Thinlay Projects On The Ground – Pavement preservation projects in Ohio

Thinlay asphalt mixtures made their debut this construction season beginning with the placement of Thinlay preservation treatments in Dark, Vinton, Clemont, and Preble counties in Ohio. The trials demonstrated Ohio’s Thinlay could be placed in a 0.75 inch thin course and with a consistently uniform texture –  a factor important to pavement preservation and overall pavement durability.

Click here to read the full article

Click here to view the MN Thinlay Specification information

2018 Specification Updates

The initial date for publishing the 2018 Spec Book has been moved to the January 26, 2018, letting, instead of the November letting. MnDOT plans to publish the 2018 Spec Book in August of 2017.

 

National Road Research Alliance (NRRA) Pavement Workshop

The NRRA is a pooled fund that focuses on solving problems that impact road owners with an emphasis on customer needs. This pooled fund will help direct and compliment the use of MnROAD test track for local, regional and national research, tech transfer and implementation needs. Click here for a list of partners with the pooled fund. Recently a two day workshop was held at MnROAD and the UMN St Paul Campus, below is a summary of the event.

The first day of the conference consisted of presentations on intelligent compaction, ARRA recycling methods, advanced performance monitoring, and updates from the various research teams (Flexible, Rigid, Geotechnical, Preventative Maintance, and Technology Transfer activities). Each of these teams submitted a list of ideas for research sections at MnROAD and the local road low volume section. Click here for 2017 construction information. After the presentations, attendees toured the MnROAD test sections and the testing equipment used for the research.

The second day of the conference consisted of general presentations and break out sessions. Charles Schwartz with the University of Maryland presented on Improving Pavement Research Implementation. Some of his solutions included:

  • Focus on fundamentals over empiricism
  • Enhance education and training
  • Increase national standardization
  • Improve research programming
  • Change mix of research project deliverables
  • Continue performance monitoring research
  • Raise industry acceptance

Click here to view the conference presentations

 

Benefits of Asphalt Parking Lots

The parking lot is often the first, as well as the last, experience that a user has of a building complex. It is the gateway through which all customers, visitors, and employees pass. This first impression is very important to the overall feeling and atmosphere conveyed to the user. Asphalt pavements are the superior choice for parking lots because they are quick to construct, long-lasting, sustainable, and cost-effective to maintain. MAPA has provided a section in the pavement design guide for guidance when designing parking lots. Click here to view the section.

NACE Awards in MN

L-R: Darin Mielke & NACE President Brian Stacy, PE.

Darin Mielke, PE, was awarded the National Association of County Engineers (NACE) 2016 Program/Project Manager of the Year. Darin, Assistant Public Works Director for Carver County, managed the design and construction phases of the Southwest Reconnection Project in the cities of Shakopee and Chanhassen.

“Engineers from around the country recognize the ingenuity and forethought that Darin brought to the project,” said Brian Roberts, P.E., NACE Executive Director.

Click here to read more.

 

L-R: NACE President Brian Stacy, PE & Richard West, PE.

Richard West, PE, was awarded the NACE 2016 Rural County Engineer of the Year during its 2017 Annual Conference held April 9-13 in Cincinnati, Ohio. Rick, the Public Works Director of Otter Tail County, has 30 years’ experience in the county engineering profession. He oversees 107 employees and an annual budget of approximately $46 million.

Click here to read more.

Lee Gustafson, P.E. Named One of Top Ten APWA Leaders in 2017

American Public Works Association

Lee Gustatson, P.E. was named one of the top ten American Public Works Association (APWA) leaders in 2017. This is one of the most coveted and prestigious public works awards is sponsored each year by APWA and is presented to ten individual leaders whose excellence in public works earns them the distinction of the Top Ten Public Works Leaders of the Year. The honorees are awarded this recognition for their professionalism, expertise and personal dedication to improving the quality of life in their communities through the advancement of public works services and technology.

Lee Gustafson’s 34-year diverse professional career in serving the public has included experience in the public works/engineering departments of three major cities within the Twin Cities metropolitan area in various roles, including as Director of Public Works and Engineering and City Engineer. He is currently serving as Senior Project Manager at WSB & Associates.

Click here for the full article. 

Calendar of Events

MAPA Member 4th Annual Golf Event – August 14
Bunker Hills Golf Club, 12800 Bunker Prairie Rd NW
Coon Rapids, MN 55448

Find out more »

MAPA Sporting Clays Event – September 25
Wild Marsh Sporting Clays, 13481 County Road 3 SE
Clear Lake, MN 55319

Find out more »

MAPA 64th Annual Membership Meeting – December 6 – 8
DoubleTree by Hilton Hotel, 1500 Park Pl Blvd
Minneapolis, MN 55416

Find out more »

MAAPT 64th Annual Asphalt Conference – December 6
DoubleTree by Hilton Hotel, 1500 Park Pl Blvd
Minneapolis, MN 55416

Find out more »

 

MAPA Member Listing – Click here

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