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原文传递 RECOMMENDED USE OF RECLAIMED ASPHALT PAVEMENT IN THE SUPERPAVE MIX DESIGN METHOD.

题名：	RECOMMENDED USE OF RECLAIMED ASPHALT PAVEMENT IN THE SUPERPAVE MIX DESIGN METHOD.
作者：	McDaniel-RS; Soleymani-H; Anderson-RM; Turner-P; Peterson-R
关键词：	Asphalt-pavements; Binders-; Blending-; Fatigue-tests; Mix-design; Reclaimed-asphalt-pavement; Recycled-materials; Shear-tests; Stiffness-; Superpave-; Tension-tests
摘要：	This report is presented in four chapters. Chapter 1 reviews the background behind the project and discusses the research approach. Chapter 2 outlines the research findings from all parts of the project. Chapter 3 discusses the implications of these findings. Chapter 4 summarizes the applicable conclusions from this research, makes recommendations for future practice based upon these conclusions and suggests additional research that may be necessary to address some unresolved issues. The main research was conducted in three separate, but related, studies. The "black rock study" investigated the question of whether reclaimed asphalt pavement (RAP) acts like a black rock or whether there is, in fact, some blending that occurs between the old and new binders. The "binder effects study" examined issues related to RAP binder testing including extraction and recovery procedures, applicability of the AASHTO MP1 tests to RAP binders and the effects of RAP content and stiffness on blended binder properties. The "mixture effects study" was directed at assessing the effects of the added RAP on total mixture properties as measured by shear, indirect tensile and beam fatigue testing. Two small-scale investigations, termed "mini-experiments," investigated the comparison of laboratory specimens to plant-produced mixtures and the effects of heating time and temperature on RAP properties. Significant findings include the conclusion that RAP is not a black rock and significant blending does occur. This means that the use of blending charts is appropriate. Recommendations are included for the best laboratory procedures to use for development of these blending charts, including a modification of the Strategic Highway Research Program (SHRP) extraction/recovery procedure. Other findings strongly support the conclusion that there is a threshold level of RAP below which its effects are negligible. This level is between 10 and 20%, depending on RAP binder stiffness. These findings validate the three tiered approaches for RAP usage as recommended by the Mixture Expert Task Group. The appendices contain some of the supplemental documents developed during this research.
总页数：	NCHRP Web Document 30. 2000/10. pp461 (85 Fig., 112 Tab., 34 Ref., 7 App.)
报告类型：	科技报告