A pavement reconstruction project on Interstate 80 in Utah was named the 2016 Triad Award winner, based on its combination of innovative concrete design, sustainability, and teamwork. The annual award is sponsored by Concrete Construction, The Concrete Producer, and Public Works magazines and cement/concrete producer LafargeHolcim. The program honors outstanding publicly-owned concrete projects that demonstrate innovation, sustainability, and leadership.
This year, judges selected a 7.5-mile stretch of I-80 between Silver Creek Junction and Wanship, Utah — part of the state’s major east/west commercial corridor. The original asphalt pavement failed to withstand the loads and environmental conditions, and required frequent repairs. The Utah Department of Transportation (UDOT) and Geneva Rock Products collaborated to devise a more durable solution.
For the first time on a UDOT project, the contractor performed a partial-depth reclamation of 4 inches of existing asphalt, mixed in cement and water to create a cement treated asphalt base on top of the remaining asphalt and underlying materials. They added 12 inches of portland cement concrete, produced onsite with a portable plant, to complete the new pavement.
In addition to recycling materials and reducing waste, the contractor worked with cement supplier, Holcim (US) Inc. to produce a more sustainable concrete mix using Envirocore cement. The cement combines limestone with portland cement clinker for a lower carbon footprint. Geneva Rock combined Envirocore with 25% fly ash replacement of portland cement, to reduce the concrete’s CO2 content by 35%. Other sustainable products included non-solvent based primer and locally sourced aggregate.
Geneva Rock also worked with Gomaco and Trimble to set up a wireless 3D paving system that created more and safer access around the paving machine. This was the first time the partners had used wireless controls to execute a zero clearance paving setup.
“This project is a great example of large-scale partial depth reclamation,” said the Triad Award judges. “They have succeeded in doing what our industry always promotes, which is using cement in innovative and sustainable ways.” The jury also selected two Runner-up projects for special recognition: the Second Avenue Subway tunnel in New York City, and a trunk sewer line extension in Ontario.