TY - JOUR
T1 - Comparison of laboratory performance of asphalt mixes containing different proportions of RAS and RAP
AU - Ghabchi, Rouzbeh
AU - Barman, Manik
AU - Singh, Dharamveer
AU - Zaman, Musharraf
AU - Mubaraki, Muhammad Ali
PY - 2016/10/15
Y1 - 2016/10/15
N2 - Despite environmental and economic advantages associated with incorporating recycled asphalt shingles (RAS) and reclaimed asphalt pavement (RAP) in hot-mix asphalt (HMA), concerns focus on fatigue and low-temperature cracking potential of pavements containing RAS and RAP. This study was undertaken to identify the areas in need for research through conducting a national survey among departments of transportation and to evaluate the effects of RAS and RAP on fatigue, low-temperature cracking and stiffness of HMA. National survey results indicated that while the fatigue cracking is the major concern when RAS and/or RAP are used in mixes, no specific test is recommended for fatigue evaluation of these mixes at the mix design stage. It was found that, fatigue life of mixes with a non-polymer-modified binder containing a blend of 5% RAS and 5% RAP led to the maximum increase in fatigue life. However, incorporation of 6% RAS decreased the fatigue life of mixes, when compared with virgin mix. Also, it was found that addition of RAS and/or RAP to asphalt mixes increased their dynamic moduli which may result in a better rutting performance. From creep compliance test results it was concluded that use of RAS and/or RAP may lead to a higher low-temperature cracking potential when compared with the virgin mixes. Findings of this study can be used to develop/update guidelines/special provisions for design of HMA containing RAS and RAP.
AB - Despite environmental and economic advantages associated with incorporating recycled asphalt shingles (RAS) and reclaimed asphalt pavement (RAP) in hot-mix asphalt (HMA), concerns focus on fatigue and low-temperature cracking potential of pavements containing RAS and RAP. This study was undertaken to identify the areas in need for research through conducting a national survey among departments of transportation and to evaluate the effects of RAS and RAP on fatigue, low-temperature cracking and stiffness of HMA. National survey results indicated that while the fatigue cracking is the major concern when RAS and/or RAP are used in mixes, no specific test is recommended for fatigue evaluation of these mixes at the mix design stage. It was found that, fatigue life of mixes with a non-polymer-modified binder containing a blend of 5% RAS and 5% RAP led to the maximum increase in fatigue life. However, incorporation of 6% RAS decreased the fatigue life of mixes, when compared with virgin mix. Also, it was found that addition of RAS and/or RAP to asphalt mixes increased their dynamic moduli which may result in a better rutting performance. From creep compliance test results it was concluded that use of RAS and/or RAP may lead to a higher low-temperature cracking potential when compared with the virgin mixes. Findings of this study can be used to develop/update guidelines/special provisions for design of HMA containing RAS and RAP.
KW - Creep
KW - Dynamic modulus
KW - Fatigue
KW - Hot-mix asphalt (HMA)
KW - Low-temperature crack
KW - Reclaimed asphalt pavement (RAP)
KW - Recycled asphalt shingles (RAS)
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U2 - 10.1016/j.conbuildmat.2016.07.029
DO - 10.1016/j.conbuildmat.2016.07.029
M3 - Article
AN - SCOPUS:84984794875
SN - 0950-0618
VL - 124
SP - 343
EP - 351
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -