Pavement Preservation News Roundup

Road Science Gets the Credit

Road Science, a Division of ArrMaz, announced that it successfully completed a comprehensive American Association of State Highway and Transportation Officials (AASHTO) On-Site Assessment and Quality Management System Evaluation of its research and development and customer support laboratory in Tulsa, Oklahoma. The review was conducted by AASHTO re:source over a four-day period, the outcome of which confirmed Road Science’s Tulsa laboratory’s continued compliance with the AASHTO Accreditation Program (AAP).

“With our Tulsa laboratory’s longstanding AASHTO accreditation, our customers can confidently rely on our data and recommendations to build their products and grow their businesses,” James Barnat, vice president, Innovation, said. “Achieving and maintaining accreditation for the past 18 years required considerable diligence and resources, demonstrating our ongoing commitment to the asphalt paving industry.”

The Certificate of Accreditation and all accreditation details for Road Science’s Tulsa laboratory can be accessed online through the Directory of AASHTO Accredited Labs.

MoDOT Rubberizes Chip Seals

In the November 2018 final report “Field Implementation of Rubberized Chip Seal” for the Missouri Department of Transportation (MoDOT), five authors offered findings from their field research through the Department of Civil, Architectural and Environmental Engineering at the Missouri University of Science and Technology in Rolla. The executive summary states:

“Recently, the research team developed a rubberized chip seal where natural aggregate is replaced with crumb rubber obtained from recycled tires. During this study, laboratory chip seal specimens and a field chip seal section with different crumb rubber replacement ratios were prepared. A total of 108 chip seal laboratory specimens were prepared to investigate aggregate retention using six tests: the standard sweep test, modified sweep test, Vialit test, modified Vialit test, Pennsylvania test, and modified Pennsylvania test. The crumb rubber showed a remarkable performance in aggregate retention measured using the Vialit and Pennsylvania tests.

“The macrotexture of the laboratory specimens was investigated using the sand patch and image processing methods and how that reflects on the skid resistance. The values of the mean texture depth (MTD), which is a measure for pavement macrotexture of rubberized chip seal specimens, were significantly higher than that of the conventional chip seal.

However, a reduction in the British Pendulum Number (BPN) was recorded with an increase in the crumb rubber replacement ratio. However, after a period of more than a year of service life in an experimental section road, the chip seal segments with 25 percent and 50 percent crumb rubber replacement ratios recorded much higher BPN compared to that of the conventional chip seal segment. A rubberized chip seal section, having up to a 50 percent crumb rubber replacement ratio by volume, was constructed successfully using standard procedures and equipment. However, it was necessary to use a steel roller compactor instead of a rubber tire compactor to compact the chip seal. This section was monitored for its texture, skid resistance, and aggregate dislodge over a period of one year.

The MTD increased significantly with an increase in the rubber content where the MTD of rubberized chip seal with 50 percent replacement ratio was increased by 77 percent compared to the conventional chip seal. Raveling distress was also observed due to snowplowing actions. No damage or any sort of distress was observed in the wheel paths due to traffic loads. Therefore, this study concluded that crumb rubber can be used in the chip seal as a partial replacement of mineral aggregates up to 50 percent. It is recommended also to increase the curing time for chip seal, regardless of aggregate type, to at least six hours to improve the performance of the chip seal.”

For more information, read the full report.

AEMA Awards Hemsley, Inducts Guiles

J. Michael Hemsley has received the 2019 AEMA Recognition of Achievement Award for his considerable contribution to the Asphalt Emulsion Manufacturers Association (AEMA) and the asphalt emulsion industry, including eight years as chair of the AEMA International Technical Committee. This award is presented to an individual, active or retired, who has made a significant contribution to emulsion technology or the advancement of the emulsion industry.

Hemsley has participated in dozens of technical committees in his more than 25 years of service to the industry. He has worked continuously through his career to improve asphalt emulsion binders and mixtures through innovative design methods, process control, laboratory analysis and formulation chemistry. He has given much of his time and effort to improving the quality of the treatments and materials that all members of AEMA are engaged in producing.

Hemsley has a B.S. in Chemical Engineering from Mississippi State University and has been employed with Paragon Technical Services Inc. since June 1995.

AEMA Past President Neil I. Guiles was honored for his lengthy and considerable service to the asphalt emulsion industry and to AEMA when he was inducted into the AEMA Hall of Fame. The hall of fame award is given to a person who has made a substantial contribution over a long period of time to the development of AEMA or the advancement of the emulsion industry. Guiles is the president of Vestal Asphalt Inc. and has been a significant contributor to the association for more than 30 years, serving as president in 1997. His involvement in manufacturing and applying liquid asphalt emulsion dates back to the 1970s when he founded his first company, Neil I. Guiles Excavating & Paving. In 1983, he incorporated as Vestal Asphalt Inc.

In 1991, he developed for international licensing, the POLYMAC Microsurfacing Systems & Technology. In 1993, he submitted a white paper on The Effect of Variables on Schulze-Breuer and Ruck Procedure. In 2000, his became the first private lab in New York to be recognized with the AASHTO Accreditation for highway material testing. In addition, Guiles has served as a board member and past president of both the Liquid Asphalt Distributors Association of New York and the Pennsylvania Association of Asphalt Materials Applicators.

These gentlemen received their awards at AEMA’s 46th annual meeting, Feb. 18-21, 2019, in Cancun, Mexico.

Partner for Cold Patch

Crafco, Chandler, Arizona, released in February the HP Asphalt Cold Patch Producer Partner Program to let qualified companies produce and market bulk Crafco HP Asphalt Cold Patch at their own plants. Through this opportunity, asphalt manufacturers can generate a new revenue stream while filling seasonal capacity voids. The Crafco Producer Partner program is designed to be a collaboration between Crafco and asphalt companies.

For more information, contact Jim Slatten at (480) 435-1624 or email jim.slatten@crafco.com. Established Crafco customers can direct inquiries to their territory manager.

Associations Elect New Boards

During its 46th annual meeting Feb. 18-21, 2019, in Cancun, Mexico, the Asphalt Emulsion Manufacturers Association (AEMA) elected its officers and board of directors for the 2019-2020 term. Todd Ryne, Nouryon, was elected president. Ryne is marketing manager, Americas, Specialty Ingredients for Nouryon, formerly Akzo Nobel Surface Chemistry LLC.

The AEMA officers elected include Vice President Bob Huitt, who is senior vice president-asphalt materials at Russell Standard Corp; and Secretary/Treasurer Dan Koeninger, who is pavement preservation division manager at Terry Asphalt Materials Inc. Moving to the role of past president is Mark Ishee, Ergon Asphalt & Emulsions Inc.

During its 43rd annual meeting at the same time and place, the Asphalt Recycling & Reclaiming Association (ARRA) elected its officers and board of directors for the 2019-2020 term. Eric Baker, Roadtec Inc., was elected president. Baker is vice president of sales & marketing for Roadtec. Stepping into the role of vice president for ARRA is Jonathan Pease, the president of Rock Solid Stabilization & Reclamation; and Kimbel Stokes, the general manager for The Miller Group Inc., will serve as secretary/treasurer. Rounding out the officers, Darren Coughlin, Coughlin Company, will serve as past president.

During its 57th annual convention at the same time and place, the International Slurry Surfacing Association (ISSA) elected its officers and board of directors for the 2019-2020 term. ISSA elected a new president, Doug Hogue, who is vice president/GM at VSS Macropaver. Larry Tomkins, vice president – sales and marketing, southeast region at Ergon Asphalt & Emulsions Inc., was elected the new vice president; Chuck Ingram, Slurry Pavers Inc., was elected secretary; and Eric Reimschiissel, American Pavement Preservation, was re-elected treasurer. Completing the officers is Rex Eberly, Bergkamp Inc., who moves to the immediate past president role.