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Performance of RAP in the system of cold inplace recycling of asphalt pavement

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Abstract

The property of reclaimed asphalt pavement(RAP) mixture will be affected mainly by composition of old asphalt/soil and cement content in CIR system. We studied the relationship between A/S and cementitious materials. It showed that if there was no soil in RAP, the unconfined compressive strength was only from 0.18 MPa to 1.07 MPa even if adding cement was from 2% to 6%, and RAP samples collapsed during conserving in water. The optimum water content rose from 6.5% to 11% with the declining of A/S from S=0 to A/S=1/5. Five RAP samples all got the maximum compressive strength when A/S=5/5, and the maximum compressive strength of the samples adding 6% cement was 3.17 MPa. It showed that the capacity of RAP was not only affected by A/S, but also by the content of cement. The dynamic modulus of RAP will increase with the rise of loading frequency and decrease with the temperature rising. SEM test showed that C-S-H interlacing formed the netted structure, and it enwrapped the aggregate and improved the strength of RAP.

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Authors and Affiliations

  1. Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology, Wuhan, 430070, China

    Baoguo Ma  (马保国), Haifeng Wang & Dingbang Wei

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  1. Baoguo Ma  (马保国)
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  2. Haifeng Wang
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  3. Dingbang Wei
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Corresponding author

Correspondence to Baoguo Ma  (马保国).

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Funded by the National High-tech Research and Development Program of China ( ‘863’ Program) (2009AA11Z106)

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Ma, B., Wang, H. & Wei, D. Performance of RAP in the system of cold inplace recycling of asphalt pavement. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 26, 1211–1214 (2011). https://doi.org/10.1007/s11595-011-0392-0

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  • DOI: https://doi.org/10.1007/s11595-011-0392-0

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