Cracks in flexible and rigid pavement occur when stress builds up, and is relieved, in surface layers. Various crack sealing and filling methods can be used to repair pavement surfaces, depending on crack sizes and crack types. The traditional procedures for preparing roadway cracks for sealing/filling are largely ineffective, labor intensive, and/or dusty. Further, working crews can be often exposed to safety hazards.
Cracks should be slightly underfilled to preclude tracking the material onto the pavement surface. For airfield pavements, the sealant should be recessed 3 mm 1/8 inch below the pavement surface; for roads, streets and parking lots, the sealant should be recessed 6 mm 1/4 inch. For pavements that are to receive an overlay, the sealant should be recessed a minimum of 6 mm 1/4 inch and a maximum of 13 mm 1/2 inch below the pavement surface.
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