National Academies Press: OpenBook

Sustainable Pavement Maintenance Practices (2011)

Chapter: Appendices A and B

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Page 26
Suggested Citation:"Appendices A and B." National Academies of Sciences, Engineering, and Medicine. 2011. Sustainable Pavement Maintenance Practices. Washington, DC: The National Academies Press. doi: 10.17226/14619.
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Page 26
Page 27
Suggested Citation:"Appendices A and B." National Academies of Sciences, Engineering, and Medicine. 2011. Sustainable Pavement Maintenance Practices. Washington, DC: The National Academies Press. doi: 10.17226/14619.
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Page 27

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Crack seal—Product used to fill individual pave- ment cracks to prevent entry of water or other non- compressible substances such as sand, dirt, rocks, and weeds. Diamond grinding—The process of removing a thin layer of existing concrete pavement surface by grinding it with a machine that has a series of closely spaced rotating diamond saw blades. Dowel bar retrofit—A method of reinforcing cracks in highway pavement by inserting steel dowel bars in slots cut across the cracks. Dust palliative—A highly diluted petroleum emulsion sprayed on an unpaved surface to control direct particulate matter emissions (commonly called “road dust”) from unpaved roads and other surfaces with vehicle and machinery traffic. Fog seal—A light application of a diluted, slow- setting asphalt emulsion to the surface of an aged pavement surface. Gravel blading—The process of spreading small amounts of gravel on localized areas of unpaved roads to fill holes, restore ride quality, and reestablish the transverse geometry (commonly called the “crown”) to facilitate drainage. Hot patches—Pothole and other pavement defect repair made with hot-mix asphalt Joint seal—Joint seals, seal expansion, and con- traction joints in concrete. Microsurfacing—A polymer-modified cold-mix paving system that can remedy a broad range of prob- lems on today’s streets, highways, and air fields. This is a mixture of dense-graded aggregate, asphalt emul- sion, water, and mineral filler. Mud jacking—Process of pumping a water, dirt, and cement mixture under concrete slabs in order to lift it. Otta seal—A low-cost type of road surface, usu- ally a 16–30-mm-thick mixture of bitumen emulsion and well-graded crushed rock. Otta seal (New Zealand)—Low-cost type of road surface, usually a 16–30-mm-thick mixture of recycled motor oil (commonly called “Norwegian road oil”) and well-graded crushed rock. Pavement preservation—The sum of all activ- ities undertaken to provide and maintain serviceable roadways. This includes corrective maintenance and preventive maintenance, as well as minor rehabilita- tion projects. Pavement preventive maintenance—Planned strategy of cost-effective treatments to an existing roadway system and its appurtenances that preserves the system, retards future deterioration, and main- tains or improves the functional condition of the sys- tem (without increasing the structural capacity). Pavement rehabilitation—Work undertaken to extend the service life of an existing pavement. This includes the restoration, placing an overlay, and/or other work required to return an existing roadway to a condition of structural and functional adequacy. Regrade/regravel—A process similar to “gravel grading” defined earlier, but including the entire length of a given road project. Shot blasting—A process that restores the micro- texture and macrotexture of both asphalt and concrete pavement surfaces by abrading it with steel shot. The process includes a magnetic system that collects and recycles the expended shot and a vacuum system that collects the residue for disposal. Slurry seal—Mixture of emulsified asphalt, water, well-graded fine aggregate, and mineral filler that has a creamy, fluid-like appearance when applied. Spread millings—The use of recycled asphalt pavement millings to maintain gravel roads. The millings are used in place of virgin aggregate. Thin overlay—A layer of new pavement that is laid on the existing surface for purposes of restoring surface characteristics with no intention of enhancing the structural capacity of the under- lying pavement. These are usually less than 1.5 in. (3.75 cm) thick. Thin portland cement concrete overlay—A thin overlay consisting of portland cement concrete (com- monly called “white-topping”). Thin hot mix asphalt overlay—A thin overlay consisting of hot mix asphaltic concrete (commonly called “black-topping”). APPENDICES A AND B Appendices A and B as submitted by the con- sultant are not published herein. These appendices are available as part of the web version of this document at: http://www.trb.org/Publications/Pubs NCHRPResearchResultsDigests.aspx, see Research Results Digest 365. 26

Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP). Persons wanting to pursue the project subject matter in greater depth should contact the CRP Staff, Transportation Research Board of the National Academies, 500 Fifth Street, NW, Washington, DC 20001. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FMCSA, FTA, or Transit Development Corporation endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. Subscriber Categories: Environment • Highways • Maintenance and Preservation ISBN 978-0-309-22349-2 9 780309 223492 9 0 0 0 0

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TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 365: Sustainable Pavement Maintenance Practices highlights the current practice in sustainable pavement maintenance and preservation.

The report is designed to help quantify and understand how pavement maintenance and preservation practices minimize environmental impacts.

As part of the development of this report, a general survey on sustainable pavement preservation and maintenance practices was issued to the state and provincial maintenance engineers in the United States and Canada. The full results of the survey and a summary of the survey are available for download as the following appendixes to NCHRP RRD 365.

Appendix A: Survey Results

Appendix B: Summary of Survey Results

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