The section of pavement that has exhibited the most heaving is U.S. Highway 212 from the Missouri River to LaPlant, which was paved in 1988. This project has developed heaves in excess of 1", spanning 3 ft to 10 ft on each side of transverse cracks. Emergency maintenance has been performed on this section by milling off the tops of the heaves to improve ridability. Two similar projects were completed in 1989 and 1990 directly west of this project. These projects have not developed heaves at this time.
The heaves are unacceptable to the traveling public. Methods or procedures must be developed to correct and/or prevent this problem.