Read the IGGA article, “Seeking Durable Pavement: Thin concrete overlay provides long-term rideability for less money,” published in the July/August issue of Roads & Bridges magazine. The story explains how the Minnesota DOT performed concrete pavement preservation on a 6-inch-thick, 24-foot-wide concrete overlay, jointed in a 6-foot-by-6-foot pattern.
The overlay was installed on I-35 in 2009. In 2023, minimal full depth repairs and diamond grinding of 184,000 square yards of pavement were performed. This reduced the International Roughness Index (IRI) measurements from 90 in the northbound lane and 100 in the southbound lane to 30 in the northbound lane and the mid-30s in the southbound lane.
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