Crafco Crack Sealant Solutions

Manufacturer:	Crafco
Model Number:	Crack Sealant Solutions
Product Class:	Other

Here are five tips to successful crack repair, whether crack sealing or crack filling: 
 

1. Crack routing. Routing is important for two specific reasons: (a) routing cleans the crack and creates uniform and fresh edges to allow the sealant to adhere better with the pavement and this applies whether you only intend to clean the crack or separately if you decide to build a designed sealant reservoir, and (b) a designed routed reservoir filled with crack sealant has the amount of sealant to expand and contract with the seasonal movement of the pavement and the sealant is at the right depth below the surface of the pavement to protect it from traffic and snowplow contact if applicable. Routing requires an additional piece of equipment and while it adds costs to any crack sealing operation research has shown that routed crack repairs are cost effective and last over twice as long as non-routed crack repairs.
2. Crack cleaning and drying. Whether routing or not, or whether crack sealing or filling, it is essential to provide a clean, dry crack channel and remove any loose material from the crack. Cracks that are damp, that contain debris or vegetation or loose aggregate or sand, will fail because the sealant won’t stick to the crack walls. Cleaning consists of using a high-pressure dry, clean, compressed air, brushing, or vacuuming to remove debris. When there is moisture, clay or vegetation you will want to use a hot air lance – caution not to burn the crack!
3. Material preparation. Contractors should be sure to follow minimum placement temperatures, minimum and maximum material heating temperatures, application life (hours material is in melter) and recommended moisture conditions prior to application.
4. Material placement. Apply material when the pavement exceeds the minimum pavement application temperature which is generally 40°F. The cracks must be dry and free from ice and other contaminants. Be sure the filling or sealing operation moves at a steady pace. The melter/applicator operator should monitor the temperature and quantity of material as over- or under-heating the material can delay the entire operation.
5. Blotting. Blotting protects the uncured crack treatment from tracking under traffic and is used in areas where traffic needs to travel on the material before it cures. Cement powder, talcum powder, lime, sand and limestone chips are common blotting materials. There are also proprietary detackifying products available that are designed specifically for blotting crack repair material.

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