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The waste engine oil (WEO) on the rheological characteristics of asphalt were studied. Two types of asphalt binders and five WEO contents (2%, 4%, 6%, 8%, and 10% wt. %) were selected to prepare WEO modified asphalt samples. Results indicated that both WEO modified asphalt had lower elastic portion, thermal susceptibility, Zero shear viscosity (ZSV), and rutting resistance, but had higher fatigue resistance and temperature sensitivity. Moreover, the effect of waste engine oil on pure asphalt is more significant than SBS modified asphalt. [ABSTRACT FROM PUBLISHER]

• The performances of foamed warm mix binders and mixtures containing reclaimed asphalt pavements were evaluated. • Foamed asphalt and mixture have a better low- temperature performances and fatigue life than those of unfoamed ones at the same RAP content, but have a worse high-temperature performances and water stability. • Asphalt foaming relieves the effects of RAP on asphalt and mixture performance. • Foamed asphalt mixture contains RAP could meet the standard requirements when RAP does not exceed 30%. Concerns exist regarding whether residual foaming water will be unfavourable for the performance of asphalt and mixtures when foamed warm mix asphalt (FWMA) binders are combined with reclaimed asphalt pavement (RAP). A series of experimental methods was utilised to evaluate the performance of FWMA–RAP binders and mixtures. It was found that the FWMA–RAP binder performance was consistent with that of the mixtures. Foamed asphalts and mixtures exhibited better low-temperature performance and had longer fatigue lives than their unfoamed counterparts did at the same RAP content, but exhibited worse high-temperature performance and lower water stability. The RAP content had a significant influence on the asphalt and mixture performances and appeared to aggravate the effect of asphalt foaming. Foamed asphalt mixtures containing RAP were able to satisfy the standard requirements when the RAP content did not exceed 30%. [ABSTRACT FROM AUTHOR]

• The ageing behaviors of WEO-modified asphalt binders were evaluated. • Asphalt binders modified with WEO were aged in RTFOT, PAV and double PAV process. • Conventional test, rheological test, FTIR and AFM were conducted on the asphalt samples at different ageing levels. • WEO could significantly improve the ageing resistance of WEO- modified asphalt. • WEO decreases the "bee-like" structures and reduces the maximum lengths of "bee-like" structures. The aim of this research is to evaluate the ageing behaviour of waste engine oil (WEO)-modified asphalt binders. Conventional properties, rheological characteristics and microscopic features were tested on the aged residues through rolling thin film oven, pressure ageing vessel and double PAV test. Results demonstrate reveal that ageing improves the high temperature performance, reduces the low temperature and fatigue performances of asphalt, while introducing WEO into asphalt significantly improves its ageing resistance. Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) results further reveal that WEO can efficiently reduce the oxygen ageing effect by supplying lightweight components. [ABSTRACT FROM AUTHOR]