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1 Task 1 - Conduct a Comprehensive Review of Worldwide Literature on PFC The project statement for NCHRP 9-41 identifies Task 1 as a comprehensive review of worldwide literature dealing with (1) design methodology; construction, maintenance, and rehabilitation strategies; safety; and performance of PFCs, conventional OGFC and similar materials and (2) their advantages and disadvantages. The project also calls for the reviews to be annotated. Because NCHRP 9-41 did not entail any field or laboratory work, the literature search and review was of paramount importance to the successful completion of this project. Individual summaries of the various items found in the literature follow. Each of the summaries are divided into nine subheadings: general, benefits, materials and mix design, construction practices, maintenance practices, rehabilitation practices, performance characterization, structural design and limitations. The âGeneralâ Subheading within each review provides a brief summary of the information contained in the document. The remaining eight subheadings are issues that were of particular interest to the successful completion of this project. Organizing each review in this manner may appear somewhat redundant; however, this organization assisted the researchers when developing the state of practices and guidelines. Within some of the reviews, comments by the authors of this report are provided to clarify or to add information that was not contained within the original text but might be of interest. These comments are provided within brackets. The reviews are provided in chronological sequence. The State of Practice contained within Volume I of this report is a synthesized version of the document. The reader should be cautioned that units within this appendix are not consistent. Units within each review represent the units utilized by the respective authors. 1.1 National Roads Authority (NRA). Porous Asphalt in Ireland http://www.fingalcoco.ie/motorway2/ASPHALT.HTML 1.1.1 General This website describes the use of porous asphalt in Ireland, the reasons for its use, advantages of its use, and brief information on a typical mix design. Porous asphalt was first introduced in Ireland within the past five years [from the time of the article, which is unknown], although it has been used in other parts of Europe for the past decade, mainly France and Belgium. Because of the increased volume of traffic and a rather wet climate in Ireland, a pavement that would allow water to drain with more ease was needed. Also, because of the high volume of traffic, a pavement that reduces noise was also a main concern.
