FEATURE with prep recommendations : “ Key components to crack sealant performance include :
• Clean Pavement- crack faces and pavement surface must be free from all dirt , dust , debris and laitance . This can be accomplished by means of compressed air with a minimum 100cfm at 90 psi . Backpack or wheeled blowers cannot adequately clean most pavements . A dirty crack will negatively affect the adhesion of the sealant .
• Dry Pavement- Crack sealing operations should not be performed when pavements are wet . Hot air lances can be used to remove light surface moisture but should not be used to attempt to dry moisture-laden pavement . Wet crack and pavement surfaces will prevent sealant adhering .
• Structurally Sound Pavement .
• Proper Temperatures – you want ambient at a minimum of 50F and a surface temperature at a minimum of 50F .
• Routing – under the right circumstances , routing can significantly increase sealant performance and longevity . Routing creates a uniform reservoir into which sealant is placed . The routed reservoir has clean vertical sidewalls which enhance adhesion , and the configuration provides for reduced stress on the sealant thereby decreasing the occurrence of adhesive or cohesive failure .” There are quite a few crack sealants to choose from . “ There are many crack sealer materials available on the market and most are made specifically for the climate in which they are used ,” stated Brian Horner , director of sales with ED Etnyre & Co ., Oregon , Illinois . “ The best results to ensure the crack sealant stays in the cracks is to make sure the cracks are clean and dry before sealant is put into place . Some cracks may require routing to enlarge the crack opening and remove any broken edges . For the best results the cracks should be blown out with high pressure and in some cases a heat lance should be used .” Horner added , “ Most cracks ¼- to 1.5-inches wide or deep can be treated with good success with a traditional wand and crack sealer . For cracks that are small-
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