Roadway Pavement Preservation 2005

Abstract

. The conference addressed all aspects of successfully implemented roadway pavement preservation activities, including management, engineering, economics, the establishment of strategic performance goals, and the implementation of routine maintenance, preventive maintenance, and minor rehabilitation activities. The objective of the conference was to provide a forum for the exchange of information on the state-of-the-art and state-of-the-practice in roadway pavement preservation. The conference included papers and presentations on surfaced and unsurfaced roadway pavement program network and project treatment characteristics.The views expressed in the papers contained in this publication are those of the authors and do not necessarily reflect the views of the Transportation Research Board or the National Research Council. The papers have not been subjected to the formal TRB peer review process. Analysis of New Zealand Chip Seal Design and Construction Practices DOUGLAS D. GRANSBERGUniversity of Oklahoma BRYAN PIDWERBESKY FIPENZ, Fulton-Hogan Limited DAVID M. B. JAMES ICC, Alberta Highway Services LimitedChip seal is the most frequently used preventive maintenance treatment on flexible pavements. Many public highway agencies use chip seals with limited knowledge of effective practices employed abroad. Information is available on good practice for materials, design, construction techniques, and effectiveness of chip seals both in the literature and through survey. This paper reports on a comparison of practices for the design of maintenance chip seals that springs from a survey of 40 U.S. states with those used in New Zealand. The study was confined to maintenance chip seals that were placed on top of an existing surface. The paper compares and contrasts the design methods used in North America and New Zealand and offers information regarding best practices in chip seal design including material selection criteria (physical, chemical, and gradation); design methodology for application rates; specifications; warranties and performancebased specifications. Additionally, it finds that area that seems to have the greatest potential for enhancement of North American chip seal practice is in the area of chip seal design. The major issue in chip seal design lies in accurately characterizing the surface on which the chip seal will be applied using engineering measurements of macrotexture and hardness. This knowledge allows engineers to select both binder types and aggregate gradations that are compatible with the surface on which they will be applied. Additionally, New Zealand pavement preservation practices such as the use of the ultra high pressure (UHP) watercutter machine to retexturize bleeding surfaces are also detailed and their potential for use in the United States is discussed. The paper finds that U.S. public agencies can benefit from an exchange of technical information between public and private organizations in each country. Additionally, it found that practices in the United States are quite similar across t...