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原文传递 Determination of Usable Residual Asphalt Binder in RAP (Recycled Asphalt Pavement).

题名：	Determination of Usable Residual Asphalt Binder in RAP (Recycled Asphalt Pavement).
作者：	I. L. Al-Qadi; S. H. Carpenter; G. Roberts; H. Ozer; Q. Aurangzeb;
关键词：	recycled asphalt pavement,recovered binder,virgin binder,binder blending;hot mix asphalt, mix design practice, dynamic modulus;
摘要：	For current recycled mix designs, the Illinois Department of Transportation (IDOT) assumes 100%contribution of working binder from Recycled Asphalt Pavement (RAP) materials when added to Hot Mix Asphalt (HMA). However, it is unclear if this assumption is correct and whether some binder may potentially be acting as black rock, and not participating in the blending process with the new binder. Furthermore, it is also unclear whether binder modifications should be considered in the mix design for recycled HMA. The goal of this research was to determine if the current IDOT mix design practice required modification with respect to the use of RAP. A set of mixtures was prepared using RAP in accordance with current practice. Additional sets were prepared using recovered binder and recovered aggregate to simulate the effect of RAP binder blending with virgin binder. Mixes containing 0, 20, and 40%RAP were prepared and the dynamic modulus testing results of these mixtures were compared to illustrate the effect of RAP on HMA. Tests on recovered, virgin, and blended binders were also conducted using the Dynamic Shear rheometer (DSR). This study found that up to 20%RAP in HMA does not require a change in binder grade. However, at 40%RAP in HMA, a binder grade bump at high temperature and possibly at low temperature is needed; more tests are required to verify the need for low temperature binder grade bumping. In addition, this study recommends RAP fractionation in the preparation of laboratory specimens. / Title Note: Research rept. / Supplementary Notes: See also PB2008-113455. Sponsored by Illinois State Dept. of Transportation, Springfield. Bureau of Materials and Physical Research. and Federal Highway Administration, Springfield, IL. Illinois Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A07 / NTIS In-house Control Codes: dotfha/iuu;12091,1101 &C / Monitor Agency Acronym: ICT / Monitor Agency Number: 09-031 / Highlights Note:%AUT:M. /Elseifi ;J. /Trepanier / Corporate Author Code: 034597013 / Classifivation: Unclassified report
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