{"title":"Trends in Use of Millings in Pavement Maintenance","authors":"Rafiqul Tarefder, Mohiuddin Ahmad, Mohammad Hossain","volume":100,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":388,"pagesEnd":393,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10000834","abstract":"
While millings materials from old pavement surface
\r\ncan be an important component of cost effective maintenance
\r\noperation, their use in maintenance projects are not uniform and well
\r\ndocumented. This study documents the different maintenance
\r\npractices followed by four transportation districts of New Mexico
\r\nDepartment of Transportation (NMDOT) in an attempt to find
\r\nwhether millings are being used in maintenance projects by those
\r\ndistricts. Based on existing literature, a questionnaire was developed
\r\nrelated to six common maintenance practices. NMDOT district
\r\npersonal were interviewed face to face to discuss and get answers to
\r\nthat questionnaire. It revealed that NMDOT districts mainly use chip
\r\nseal and patching. Other maintenance procedures such as sand seal,
\r\nscrub seal, slurry seal, and thin overlay have limited use. Two out of
\r\nfour participating districts do not have any documents on chip
\r\nsealing; rather they employ the experiences of the chip seal crew. All
\r\ndistricts use polymer modified high float emulsion (HFE100P) for
\r\nchip seal with an application rate ranging from 0.4 to 0.56 gallons per
\r\nsquare yard. Chip application rate varies from 15 to 40 lb\/ square
\r\nyard. State wide, the thickness of chip seal varies from 3\/8'' to 1'' and
\r\nlife varies from 3 to 10 years. NMDOT districts mainly use three type
\r\nof patching: pothole, dig-out and blade patch. Pothole patches are
\r\nused for small potholes and during emergency, dig-out patches are
\r\nused for all type of potholes sometimes after pothole patching, and
\r\nblade patch is used when a significant portion of the pavement is
\r\ndamaged. Pothole patches last as low as three days whereas, blade
\r\npatch lasts as long as 3 years. It was observed that all participating
\r\ndistricts use millings in maintenance projects.<\/p>\r\n","references":"[1] Gilbert Y. Baladi, Tunwin Svasdisant, Thomas Van, Neeraj Buch,\r\nKarim Chatti (2007). Cost-Effective Preventive Maintenance: Case\r\nStudies. Transportation Research Record, paper no. 02-3026.\r\n[2] MDT (2009). Maintenance Manual. Montana, USA.\r\n[3] State of California Department of Transportation (2008). Maintenance\r\nTechnical Advisory Guide: Volume I \u2013 Flexible Pavement Preservation,\r\nSecond Edition. California, USA.\r\n[4] NCHRP (2005). Chip Seal Best Practices. Synthesis 342. Washington\r\nD.C., USA.\r\n[5] FHWA (1992). An Overview of Surface Rehabilitation Techniques for\r\nAsphalt Pavements. Washington, D.C., USA.\r\n[6] WSDOT (2003). Asphalt Seal Coats. Washington, USA\r\n[7] MDT (2004). Scrub Seals Using Asphalt Emulsions. Montana, USA\r\n[8] UDOT (2004). Scrub Seal Coat. Technical Bulletin MT-04.01. Utah,\r\nUSA\r\n[9] ISSA (2001). Recommended Performance Guidelines for Emulsified\r\nAsphalt Slurry Seal. Maryland, USA.\r\n[10] VDOT (2011). Slurry Surfacing Certification Study Guide. Virginia,\r\nUSA.\r\n[11] IowaDOT (2014). Developmental Specifications for Hot Mix Asphalt\r\nThin Lift Overlay. Iowa, USA.\r\n[12] Walubita L.F., and Scullion T. (2008). Thin HMA Overlays in Texas:\r\nMix Design and Laboratory Material Property Characterization. TxDOT\r\nReport 0-5598-1, Texas, USA.\r\n[13] Web-3: http:\/\/www.azdot.gov\/docs\/default-source\/materialslibrary\/\r\nitem404h.pdf, consulted 19th June 2014.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 100, 2015"}