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ABSTRACT
Fibre is one of the most popular additives in hot mix asphalt (HMA). However, there are few research studies about the application of fibres in cold recycled mixture with asphalt emulsion. In this study, five popular fibres are introduced to the emulsion recycled mixture, including polyester fibre, polypropylene (PP) fibre, polyacrylonitrile (PAN) fibre, lignin fibre, and basalt fibre. The optimum pre-mixing water (OPW) content, optimum emulsion content (OEC) and optimum fibre content of recycled mixtures reinforced by fibres are determined. The indirect tensile strength (ITS), moisture susceptibility, bending cracking at low temperature, rutting and fatigue life of mixtures with these fibres are investigated. The test results indicate that the OPW and OEC of recycled mixture are influenced by types and contents of fibres. Although different fibres lead to obviously different ITS values, the optimum content for each fibre is near 0.3% by weight of RAP. All five fibres improve the performance properties of the emulsion recycled mixture. The improved percentages depend on the type of fibres. Polyester fibre has higher improvement on fatigue life than the other fibres. Therefore, polyester fibre is recommended as the most effective fibre to improve the emulsion recycled mixture.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Funding
This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (grant number 2019JM-217); Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry; National Natural Science Foundation of China (grant number 51978067).
Additional information
Notes on contributors
Shaowen Du
Shaowen Du is the only author, who takes responsibility for all of this manuscript.