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... 1 Introduction ACRP Project 02-31 was designed to provide a thorough investigation of airport sound insulation products and procedures to identify possible causes for deterioration in sound insulation performance over the years. The investigation included researching project documents and identification of installation methods, treatments, and materials used in early projects.
From page 2...
... 2The sections are organized to discuss durability issues and the findings of other research projects and connect the findings to the day-to-day tasks of a sound insulation project from program management to project closeout and maintenance. Although other guidelines are frequently referenced throughout this report, in some cases it was necessary to briefly discuss a topic in order to provide needed clarity and context.

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