Evaluation of reclaimed asphalt pavement binder stiffness without extraction and recovery

Abstract：A new testing procedure to estimate the low-temperature stiffness of the reclaimed asphalt pavement (RAP) binder was developed.In the testing procedure,the SuperpaveTM Bending Beam Rheometer (BBR) with special modifications end binder blending charts by Asphalt Institute were utilized.Modifications involved the development of a new kind of sample mold and different testing parameters were made to BBR testing procedure to capture the rheological properties of bitumen mortars produced by mixing fresh binder with fine RAP materials or RAP aggregate.The stiffness relationship between binder and bitumen mortar was established based on the BBR test results.The blended binder stiffness in bitumen RAP mortar was estimated from the RAP mortar stiffness based on the binder-mortar relationship.And finally,the RAP binder stiffness was estimated from the blended binder end fresh binder stiffness based on the blending charts by Asphalt Institute.The results indicate that the new procedure can capture the theological properties of bitumen mortar and can be used to estimate the low temperature stiffness of RAP binder without binder extraction and/or any chemical treatments. 作者： Author： MA Tao[1]  HUANG Xiao-ming[2]  U. B. Hussain[3] 作者單位： School of Transportation, Southeast University, Nanjing 210096, China;Department of Civil and Environmental Engineering, University of Wisconsin-Madison, WI 53706, USASchool of Transportation, Southeast University, Nanjing 210096, ChinaDepartment of Civil and Environmental Engineering, University of Wisconsin-Madison,WI 53706, USA 期 刊： 中南大學學報(英文版)   EISCI Journal： Journal of Central South University of Technology(English Edition) 年，卷(期)： 2011, 18(4) 分類號： U414 Keywords： aged binder    reclaimed asphalt pavement    mortar    stiffness    Bending Beam Rheometer    blending chart    機標分類號： U41 TB3 機標關鍵詞： asphalt pavement    testing procedure    mortar    relationship    rheological properties    RAP    blending    low temperature    based    results    development    new    materials    different    special    made    kind    Beam 基金項目： the Ministry of Communication of China，the National Natural Science Foundation of China，the Department of Communication of Zhejiang Province,China

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