Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.
xii ABSTRACT This report documents the research performed under NCHRP Project 10-65. The goal of the project was to identify effective nondestructive testing (NDT) technologies that are ready for implementation into routine quality control and acceptance of flexible pavement construction based on field evaluations. The study also endeavored to recommend appropriate test protocols to aid in agency implementation. The report describes the scope of this study, describes the research activities undertaken, and presents field and laboratory test results that formed the basis for the development of the procedural manual for implementing the recommended NDT methods into routine practice. This document will be of interest to highway materials, construction, quality assurance, pavement management, safety, design, and research engineers, as well as highway contractors and material suppliers. The project commenced with a review of agency practices, including their quality control and acceptance procedures and material properties that are used as acceptance quality characteristics. This was followed by a review of available information on NDT technologies, their applications in testing individual flexible pavement layers, and their ability to estimate material properties which are sensitive to pavement performance. Promising technologies were evaluated through a comprehensive field testing program that was divided into two partsâPart A assessed the technologiesâ ability to effectively identify construction anomalies or physical differences along a project and practicality for immediate implementation into routine quality assurance; Part B used selected methods from Part A and refined the test protocols and data interpretation procedures for judging the quality of flexible pavement construction. This report provides recommendations on technologies and protocols for use in quality control and acceptance of unbound layers, as well as hot mix asphalt layers and overlays. The report also contains three appendices containing supplemental information on NDT procedures and data collected during the project.
