Click for next page ( 8


The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement



Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 7
7 CHAPTER 3 Identification of Pavement Alternatives and Development of Pavement Life-Cycle Strategies 3.1 Overview 3.3 Development of Potential Alternatives This chapter presents a process for identifying feasible pavement-type alternatives for a given project by consider- The pavement-type selection process should be compre- ing life-cycle strategies required to achieve a desired per- hensive and transparent. Engaging a pavement-type selection formance level throughout a specific period. The process committee composed of representatives from the agency, begins with identifying potential alternatives to be con- industry, and the research community would ensure that a sidered. From this broad group of alternatives, unfeasible broad range of input was received on existing as well as inno- options are eliminated by applying project-specific con- vative techniques. The selection process would provide a set of straints. Strategies (including initial pavement structural alternatives that should be considered. It is expected that these design and probable M&R activities) over the life cycle of alternatives reflect the findings of national and state research the pavement are identified for each of the remaining studies, regional experience, type and size of projects, and type alternatives. of traffic the pavement is expected to carry. Figure 2 presents a suggested process for the selection of potential alternatives. One of the key components of identifying alternatives is 3.2 Pavement-Type determining what does or does not work in the geographic area Selection Committee where the project will be constructed. An agency's pavement It is suggested that agencies form a pavement-type selec- management system is a good source of data for making this tion committee that includes representation from pave- determination. Pavement management systems usually contain ment design, materials, construction, and maintenance condition data that can be used to determine the performance groups. The committee should provide a formal mecha- of the various pavement designs and materials. Where pave- nism for seeking input from the paving industry. The pur- ments perform better than expected, this input can be fed into pose of the committee is to identify a broad range of the LCCA. Where pavement performance is not as good as alternatives for consideration in a systematic and unbiased expected, an evaluation should be made to determine if the defi- manner. The following are the key responsibilities of the ciencies can be corrected through design or material modifica- committee: tions. This process also may identify regions or specific traffic conditions where there are differences in performance. How- Developing and maintaining a list of strategies that should ever, using these data should not preclude the consideration of be considered in the pavement-type selection process. designs for which the agency has little or no experience. In those Addressing sustainability and other nonengineering cases, performance estimates can be based on the experiences of considerations. other agencies, together with the application of analysis tools Making the pavement-type selection on projects where mul- such as the American Association of State Highway and Trans- tiple feasible alternatives are identified, with no clear advan- portation Officials (AASHTO) Mechanistic-Empirical Pavement tage to any of the alternatives. Design Guide, Interim Edition: A Manual of Practice (AASHTO Performing periodic reviews of the pavement-type selection 2008). The sustainability of the various alternatives also must be process and recommending modifications for improvement. considered.