Whether a crack is working or non-working can generally be determined by its type, also determined Crack Sealing Machine choice. Working cracks are usually transverse in orientation; however, some longitudinal and diagonal cracks may meet the 3-mm movement criteria. Materials placed in working cracks must adhere to the crack sidewalls and flex as the crack opens and closes. Rubber-modified materials designed for low-stress elongation, especially at low temperatures, are preferred for treating these cracks after Crack Sealing Machine repaired.
Non-working cracks typically include diagonal cracks, most longitudinal cracks, and some block cracks. Because of the relatively close spacing or free edges between non-working cracks, little movement occurs. Minimal movement permits the use of less expensive, less specialized crack-filler materials. Experienced personnel can usually determine if the targeted crack type is working or non-working, and provides recommended criteria for determining which cracks to be sealed and which to be filled by using Crack Sealing Machine.
