Problem The Ohio Department of Transportation (ODOT) District 4 had experienced unstable road panels for over a year on a section of highway I-80. This particularly busy and failing section of panels began to settle even more during winter months. ODOT attempted to mudjack them using cementitious grout but achieved only limited and temporary improvement. As water entered the pavement system and mixed with the pulverized grout, the constant pounding of traffic pumped the slurry mix out of the control joints and strained the concrete pavement, resulting in premature slab cracking and up to four inches of renewed settlement. This settlement forced lane closures due to safety concerns. Analysis The section of interstate to be repaired consisted of 14-inch concrete panels, a four-inch

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