Iowa State University. National Concrete Pavement Technology Center

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Premature deterioration of concrete at the joints in concrete pavements and parking lots has been reported across the northern

states. The distress may first appear as shadowing when microcracking near the joints traps water, or as cracks parallel to and

about 1 inch from the saw cut. The distress later exhibits as a significant loss of material. Not all roadways are distressed, but the

problem is common enough to warrant attention.

The aim of the work being conducted under this and parallel contracts was to improve understanding of the mechanisms behind

premature joint deterioration and, based on this understanding, develop training materials and guidance documents to help

practitioners reduce the risk of further distress and provide guidelines for repair techniques.

While work is still needed to understand all of the details of the mechanisms behind premature deterioration and the prevention

of further distress, the work in this report has contributed to advancing the state of the knowledge.

US Transportation Collection