US-75 Overlays, Brown & Nemaha Counties, Kansas (Koss #78 & #79)

In 2013, Koss paved a portion of US-75 from the Nebraska line, South to Sabetha, KS. The project was exciting in many ways. First, this contract was let as an alternate bid project taking concrete vs. asphalt. Koss was successful in securing the contracts with a 4” concrete overlay. Second, we were excited to showcase another application of concrete pavement in Kansas, by performing a 4” overlay on a 2-lane highway, under traffic. Things became even more exciting as the project got underway. Once the existing asphalt roadway was milled in preparation for the concrete overlay, it quickly became clear that the underlying asphalt pavement would be unsuitable to handle a thin concrete section. Koss and KDOT came together and deemed the best solution would be to reconstruct the highway using 8” dowel jointed concrete pavement.

US-75 Overlays
US-75 Overlays

Using a pilot car and flaggers stationed 24 hours a day to keep traffic moving, Koss removed more of the existing asphalt pavement to accommodate for the increased pavement thickness. The remaining asphalt pavement was mixed in-place with Portland Cement to provide a strong base to place the concrete on. Using multiple resources from each division in the company, Koss delivered this project on time, even after being delayed by unforeseen conditions. After diamond grinding to provide an exceptionally smooth pavement, Koss proved that full depth concrete pavement reconstruction can be successful on a 2-lane facility under traffic.