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flag Iowa State and Iowa DOT test recycled plastic 3D-printed geogrids, boosting gravel road strength and durability with no maintenance needed.

flag Iowa State University and the Iowa DOT are testing 3D-printed geogrids from recycled plastic to strengthen gravel roads in Buchanan County. flag After two years, reinforced roads showed 30% higher bearing capacity, 20% greater stiffness, and 10%–20% less moisture, with no maintenance needed. flag The project, aimed at improving Iowa’s 71,000 miles of gravel roads, may expand statewide and beyond, offering a sustainable, cost-effective solution. flag Research continues to assess long-term performance and scalability.

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