Colorado Public Works Journal, Fall/Winter 2022

Fall 2022 5 WWW.CO-ASPHALT.COM LOCAL AGENCY NEWS Although water does not drain through SMA, its surface texture is similar to that of open-graded friction course (OGFC). Therefore, SMA surface has high frictional resistance, which provides improved safety to motoring public when traveling on wet pavements. CDOT, E470 and the NW Parkway each use SMA for surfacing across their urban corridors. Local Agencies have also been successfully placing SMA on arterial roads since 2002. The list of Front Range municipalities that have used SMA continues to grow. The list now includes Aurora, Denver, Lakewood, Commerce City and most recently Westminster, Parker, Jefferson County and Castle Rock. SMA does have a higher price per ton verses traditional dense graded asphalt, however, local agencies are seeing a significant return on their investment through increased performance life. The City of Aurora has been using SMA along their major arterial roads since 2002 and has placed almost 700,000 tons to date. All of Aurora’s projects have utilized the mill and fill process, varying from 2-inch to 3.5-inch in depth. “Aurora has seen and documented a 60% extended life of our pavements wearing course utilizing this technology and our plan is to continue the use of SMA on the Aurora arterial network (Aurora Streets Division).” Frank Castillo CAPA: Tell us about this project on Loop Road for the Town of Castle Rock. FC: “Loop Road is one of our major arterials. This is a very busy street for our residents and ongoing commercial projects. We choose to place a ¾” SMA material because of its rut resistance and structural performance. We’re really looking forward to this, it looks great going down, I’m very pleased with the product and can’t wait to see how it performs.” CAPA: What are your plans for future use of SMA? FC: “We think it’s a great product. We’ll monitor it to see how it wears and probably use it again in the future.” CAPA: We’re seeing more and more local agencies along the Front Range using SMA and implementing it into their Street Improvement and Capitol Project Programs. What is your guidance to others who have never tried it? FC: “It’s been a great choice for the Town as a surface lift for this higher volume road. It’s a great strategy to use when needed. We are planning to submit this project for a ‘Best in Colorado’ award this year…and hopefully win!”

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