Best Practices for Crack Treatments for Asphalt Pavements (2014) / Chapter Skim
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Pages 22-33
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22 C H A P T E R 4 It is well established that crack sealing and crack filling are cost-effective pavement maintenance techniques. As with any other activity, it is imperative that the work be done with appropriate equipment and in the best manner possible in order to get good performance.
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23 evaluation section for crack treatment to be justified (16)
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24 and 70°F for both crack sealing and crack filling.
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25 integrity perspective. If the sealant sticks to vehicle tires, it can be pulled out of the crack, resulting in a failure of the crack sealant.
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26 Crack Preparation A controversial subject is whether to cut the crack prior to the treatment. Crack cutting can be performed either by a diamond saw or a rotary impact router, shown in Photographs 4-4 and 4-5, respectively.
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27 Diamond Saw Rotary Impact Router Operation Small wide-diameter blade Multiple impacting cutting heads Cut Description Smooth-walled reservoir Rougher surface Reservoir Description More rectangular Higher % aggregate surface area More maneuverable Follows cracks more closely Production Low 1.2 to 2.1 m/min High 3.6 to 4.6 m/min Maintenance Faster blade wear Table 4-2. Sawing versus routing (16)
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28 of 150cfm (16, 21, 22)
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29 is a valuable tool for crack sealing and should be used cautiously to avoid damage to the existing pavement. Appropriate safety gear should always be used.
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30 within the discharge plumbing to provide monitoring of the sealant throughout the operation (81)
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31 Safety It is important for all sealant crewmembers to understand safety requirements for handling the sealants and the equipment being used. Sealant and equipment manufacturers provide recommended safe operating procedures for their products.
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32 Graphic 4-6. Metal die for QC of routing depth and width (24)
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33 Conclusion The primary focus of crack treatments is to achieve a pavement maintenance application that will perform well under a variety of environmental and traffic conditions. As with most pavement construction activities, there are many, many details that must be given attention.
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