Preparation And Characterization Of Waste Cooking Oil-based Bio-asphalt

Bio-asphalt is a material with biomass as raw material,and ultimately converted into which has the function of asphalt materails.It has the characteristics of wide source,environmental friendly,and so on.In this paper,the waste cooking oil residue,hard asphalt particle,petroleum resin,styrene butadiene rubber,and montmorillonite were used as raw materials,by using the constrained uniform formulation design method to design quality ratio,and selecting the addictives to improve the storage stability and thermal oxygen stability of system,finally,the waste cooking oil-based bio-asphalt was prepared.The road performance,chemical composition and microstructure of waste cooking oil-based bio-asphalt were analyzed comprehensively,the main conclusions were as follows:(1)Based on the constrained uniform formulation design method,the optimal mass ratio of waste cooking oil-based bio-asphalt is waste cooking oil residue: hard asphalt particle: petroleum resin: styrene butadiene rubber: montmorillonite= 0.33: 0.37: 0.2: 0.05: 0.05.When the content of dispersant and aromatic oil were 1.5% and 1.2%(by the mass fraction of waste cooking oil residual),respectively,the softening point difference is 0.5 ℃,the storage stability of the system is good.Suitable crosslinking agent and anti-aging agent can promote the formation of space network structure,inhibit the formation of free radicals,and improve the thermal and oxygen stability of the material.(2)The low-temperature performance of waste cooking oil-based bio-asphalt is excellent,the ductility at 5℃ is over than 150 cm,and the value of stiffness and creep rate at-36 ℃ are 236 MPa and 0.341,respectively,which meet the relevant requirements of specification.The high-temperature properties of SBS modified asphalt is the best,followed by waste cooking oil-based bio-asphalt,70# matrix asphalt,the softening point value were 56.9 ℃,52.3 ℃ and 49.1 ℃,respectively.The penetration-temperature sensitivity factor of waste cooking oil-based bio-asphalt was 0.037,and the adhesion grade is five,the temperature sensitivity of system is low and the ability of anti-stripping is outstanding.(3)Compared with petroleum asphalt,the asphaltene content of waste cooking oil-based bio-asphalt is significantly smaller,the colloid instability index was 0.34,and the system tended to be sol-type.The Pyrolysis gas chromatography showed that the benzene content of waste cooking oil-based bio-asphalt is similar to petroleum asphalt,and there are no toxic substances,such as phenol and naphthalene.The infrared spectrum distribution of waste cooking oil-based bio-asphalt is quite different from that of petroleum asphalt,which has the characteristic absorption peak of ester,carboxyl and S-S.Through the analysis of element composition,the ratio of carbon to hydrogen was 0.61,the ratio of oxygen to carbon was 0.03%.Compared with petroleum asphalt,the hydrogen chain saturation of waste cooking oil-based bio-asphalt is relatively low,and there are many aromatic rings.The results show that the road performance and environmental benefits of waste cooking oil-based bio-asphalt are also excellent,which can be used as a substitute material for petroleum asphalt for the construction of pavement in cold areas.