Use of bio-based products towards more sustainable road paving binders: A state-of-the-art review  

作　　者：Alessio Musco Giulia Tarsi Piergiorgio Tataranni Ernesto Salzano Cesare Sangiorgi 

机构地区：[1]Department of Civil,Chemical,Environmental and Materials Engineering(DICAM),Alma Mater Studiorum-University of Bologna,Bologna 40131,Italy

出　　处：《Journal of Road Engineering》2024年第2期151-162,共12页道路工程学报（英文）

基　　金：The research is funded by the NEXT GENERATION EU–PNRR project ex D.M.352/2022.The authors would like to thank ENI S.p.A for supporting this research.

摘　　要：Many industrial sectors exploit fossil sources to develop useful and necessary materials for our needs,such as bituminous paving materials.Bitumen,a key component of asphalt mixtures,is derived from oil refining and its properties are influenced by the crude oil source and refining process,resulting in a significant carbon footprint.With growing awareness of resource depletion and environmental concerns,pavement researchers are exploring sustainable alternatives to reduce dependence on fossil sources.This includes a rising trend in using renewable materials like biomasses to produce bio-based binders as substitutes for bitumen,aiming for a more sustainable approach.Biomasses,including vegetal and animal wastes,and waste cooking oils,as substitutes for crude oil in the production of bio-binders.Through thermochemical conversion(TCC),such as pyrolysis,biomasses can be converted into bio-char and bio-oils,which can replace fossil-based components in binders.Researchers have utilized these bio-products to reduce the dependency on fossil fuels in binders.However,there are no set minimum requirements for bio-components in bio-based binders.As the percentage of replaced bitumen increases,various types of binders are produced,including modified bitumen,extended bitumen,and alternative binders,where the fossil replacement is gradual.Overall rheological tests on bio-binders,reveal that those containing biochar exhibit increased viscosity,stiffness,rutting resistance,and sometimes antioxidant properties.Conversely,bio-binders with bio-oils as bitumen substitutes show poorer performance at high temperatures but improved behavior at low temperatures.These results suggest that bio-binders could provide versatile solutions for various climatic and loading conditions in road construction.However,the development of pavement mixtures based on bio-binders has not been studied in depth and requires further attention to unlock its full potential.As sustainability considerations,including life cycle assessments(LCA)and life cycle cost

关 键 词：BIOMASS Chemical process Bitumen replacement Bio-binder Paving material 

分 类 号：U414[交通运输工程—道路与铁道工程]