Rehabilitation and repair of existing saw-cut joints in PCC pavements are needed because wheel load is not transferred equally from one slab to the next. The higher stress can cause cracking. Additionally, incompressible materials that get into the joints are squeezed when concrete expands at high temperatures, resulting in the development of high stresses that can cause spalling. Maintaining joints with a sealant keeps out incompressible materials and water to ensure a level surface.