Limiting Damage to Flexible and Composite Pavements due to the Presence of Water Guidelines (2025) / Chapter Skim
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3 FINDINGS AND APPLICATIONS
3 FINDINGS AND APPLICATIONS
Pages 10-19
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that identifies the best practices for minimizing asphalt and composite pavement damage due to the presence of water. Additional products accompanying the Guidelines are a webinar to help promote the use of the Guidelines document, training course materials that demonstrate how the Guidelines document can be used for designing, building, maintaining, and rehabilitating asphalt concrete and composite pavements so that they are less susceptible to moisture damage, and a web-based computer application (DRAIN)
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Chapter 3 provides basic descriptions for four different mechanisms that contribute to the different forms of moisture damage in an asphalt or composite pavement. These mechanisms include material softening/weakening, frost heave, asphalt stripping, and subsurface pumping.
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• Subsurface drainage design -- A drainage system consisting of permeable layers, edge drains, underdrains, or horizontal drains, will help remove moisture entering the pavement from targeted sources before it significantly compromises the pavement structure (see Figure 3)
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Chapter 5 -- Consider Available Materials Chapter 5 provides detailed guidance and information on the selection of paving materials associated with the various design features described in Chapter 4. These materials and their related characteristics should be thoroughly considered when trying to correct or limit moisture damage in a pavement.
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Two additional topics are addressed in Chapter 6: the proper installation and construction monitoring of drainage systems and the basic design considerations for roadway widening.
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They also seal the pavement surface against moisture infiltration. Descriptive information and guidance are provided on seven types of surface preservation treatments appropriate for flexible and composite pavements, including scrub seals, chip seals, slurry seals, microsurfacing, cape seals, ultra-thin bonded wearing courses, and thin overlays.
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Fatigue Fatigue Fatigue Fatigue Block Block Rejuvenating Seal* Fatigue Fatigue Fatigue Fatigue Block Block Block Block Chip Seal*
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OTHER KEY PROJECT DELIVERABLES Webinar A 90-minute webinar was developed to help introduce and promote the use of the Guidelines document. Training Course A 1-day training course was developed as a resource to provide training on the use of both the Guidelines document and the associate web-based application tool (DRAIN)
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DRAIN Tool The DRAIN tool is a web-based application that allows users to enter information about a given project and access information within the Guidelines document to help address a moisture problem in an AC or composite pavement. In other words, DRAIN provides a programmatic interface to the Guidelines document, directing the user to the methods applicable for the pavement they are designing or maintaining.
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SUMMARY With the increasing emphasis on improving pavement engineering practices to get the most out of taxpayer dollars, NCHRP Project 01-54 is a timely study. By developing the comprehensive Guidelines document and incorporating the approaches into standard practice, this NCHRP project provides the tools that highway agencies and public works departments need to better address moisture problems in their pavements and realize better performing, longer lasting pavements.
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