Best Practices for Crack Treatments for Asphalt Pavements (2014) / Chapter Skim
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4C H A P T E R 2 Summary of the Literature Review Scope of Work A literature review was conducted on the state-of-the-art for crack sealing and crack filling. Approximately 115 technical publications, state specifications, and test methods were reviewed.
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5 • The center image of the middle row illustrates sealing in the spring/autumn. The crack is at a "middle" size and will have less deformation of the sealant during cold and hot temperatures.
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6• Longitudinal Cracking (both in the wheelpath and between wheelpaths) • Reflection Cracking at Joints • Transverse Cracking While treating any crack may ultimately provide some benefit to the underlying pavement structure through the reduction of moisture intrusion, the most advantageous applications for crack sealing and/or crack filling are block, longitudinal, reflection, and transverse.
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7 cohesive failure in the sealant. Use of backer rod as a bond breaker is illustrated in Graphic 2-3.
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8Chehovits and Manning (36) describe the advantages and disadvantages of overband (also known as band-aid)
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9 Type II: Sealant for most climates, with low-temperature performance tested at -29°C with 50% extension. Type III: Sealant for most climates, with low-temperature performance tested at -29°C with 50% extension -- special tests are also included {ASTM notes that these specification requirements were formerly Federal Specification SS-S-1401C}.
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10 issues are the direct tension test, bending beam rheometer, and adhesion tests. At high in-service temperatures, the key issues are for the sealant to have sufficient elasticity against intrusion of debris and to resist flow and softening that could result in sealant tracking.
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11 (23) caution that routing may be detrimental to pavements over 6 years old due to aging of the mixture.
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12 melter must be capable of safely heating product to 400°F. The temperature control should not allow the heat transfer oil to exceed 525°F.
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13 Details on these evaluations can be found at www.ntpep.org. Work done by the crack treatment pooled fund study (8, 84)
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