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《Journal of Central South Highway Engineering》 2007-02
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Effects of RAP Content on Performance of Cold Reclaimed Asphalt Mixture

ZENG Menglan1,XIAO Jie1,WU Chaofan2,HUANG Kaiyu2 (1.College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China;2.Hunan Institute of Transportation,Changsha,Hunan 410015,China)  
It is a common practice to add new mineral aggregate to reclaimed asphalt pavement(RAP) for correcting gradation and/or supplementing quantity.However,the effect of the new aggregate remains unclear.This paper discusses the effects of RAP content on the performance of cold reclaimed asphalt mixture using asphalt emulsion through laboratory tests.Test results and result analyses on six mixtures having 0 % to 100 % RAP contents show that both resilient modulus and compressive strength rapidly decrease with RAP increasing RAP content in nearly linear function,the resilient modulus varying from 2 700 MPa to 830 MPa and from 3 000 MPa to 890 MPa at 20 ℃ and 15 ℃,respectively.Both the indirect tensile strength and failure stiffness modulus moderately decrease with RAP content also in linear function,the indirect tensile strength varying from 0.75 MPa to 0.58 MPa at 15 ℃.The dynamic stability drastically decreases from 9 000 cycles/mm to 3 600 cycles/mm with RAP content at 40 ℃ following an exponential function.On the other hand,both the failure strain and flexural strength increase with RAP content again in linear function,the failure strain varying from 1 500 με to 2 000 με at-10 ℃.
【CateGory Index】: U414.75
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