Colorado Public Works Journal, Fall/Winter 2022

WWW.CO-ASPHALT.COM AROUND THE ASPHALT INDUSTRY 26 /The Road Ahead Asphalt Industry Benefits from Increasing WMA Use Attitudes toward warm-mix asphalt (WMA) technologies available to mix producers have improved in recent years. Since the original article from which this piece is derived ran in July 2019, DOTs and producers have found value in reducing temperatures for both fuel cost and emissions reductions, which is good news for the latest initiative from the National Asphalt Pavement Association (NAPA), titled “The Road Forward.” Whether the plant uses a mechanical foaming process or a chemical or plant-based additive to produce WMA mixes, the end goal for producing a WMA pavement mix can be multifaceted. The asphalt industry has, as a collective, learned of multiple benefits of producing and placing WMA. According to the Federal Highway Administration’s Every Day Counts program, the production temperature reduction is 30-120_F below traditional HMA. According to the Construction Innovation Forum NOVA Award official video presentation, the reduction is 30-75_F below traditional HMA. Either way, Producers are seeing decreased fuel consumption and reduced emissions with reduced production temperatures. Paving crews are seeing reduced fume at the job site with reduced mix temperatures. State DOTs are seeing fit to include incentives for innovations—such as the use of various WMA additives—to enhance a balanced mix design (BMD). With all of the technological advancements in materials and methodologies, CDOT only uses WMA in approximately 15% of their tonnage placed to date. “A recent trend in WMA additive technology is the rollout of products that offer secondary features such as compatibility with a wider range of asphalt modifiers, and features related to improving plant and paving crew comfort and safety by reducing odors and the health hazards associated with the additives themselves,” Ivann Harnish said, the commercial director for Road Science®, a division of ArrMaz, located in Tulsa, Oklahoma. That trend has not only continued since 2019 but ramped up. Odor suppressants join the rejuvenators and anti-stripping agents on the market, and original equipment manufacturers have fashioned componentry to make adding these elements easier on the producer. Lance Brooks, sales manager at Ingevity, North Charleston, South Carolina explained: “In general, DOTs and agencies test for rutting, cracking and moisture resistance in their pavements. During the construction process, consistent compaction (density) is critical for contractors. An additive like Ingevity’s Evotherm allows agencies and contractors the ability to achieve these goals while seeing the added benefits of the lowest temperatures, ease of use, and proven performance.” Brooks reflected on the past and the future of WMA: “Over the last 15 years, we have seen an increase in the adoption of WMA by agencies, as well as increased contractor usage of the technology. It is exciting to see WMA enable contractors and agencies to achieve their goals.” By Sandy Lender Editor AsphaltPro Magazine Originally published in Asphalt Pro Magazine (July 2019) Reach more than 2,000 Influential Key Industry Decision Makers CONNECT WITH CAPA MEMBERS IN 2023 CAPA 2023 Membership Directory Published in conjunction with Colorado Public Works Journal To advertise your business in either of these publications. The 2023 CAPA Membership Directory or The Road Ahead. Please contact Jo Taylor on: Tel: 720 360 6737 Email: jo@coloradopublicworksjournal.com

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