Concrete Damage Series, Part 7

Longitudinal Joints

Longitudinal paving joints are constructed to be narrow and usually well sealed. As pavements age and materials deteriorate, joints may open and widen, causing further deterioration. Cracks parallel to the initial joint may develop and accelerate into spalling or raveling of the longitudinal joint. Settlement, instability, or pumping of the subgrade soil can cause longitudinal joints to fault. One common cause of cracks parallel to the longitudinal joints is waiting too long after the pour to saw the joint. Then, during initial cure the slab will crack roughly parallel (but not exactly) to the sawn joint. Maintaining a tight joint seal can prevent intrusion of water and reduce freeze-thaw damage and pumping. Joint deterioration can be fixed with Concrete Welder in cartridges. If the deterioration is severe, it can be patched with FlexSet.