In order to explore the applicability of environment-friendly polyurethane(EPU)in modified asphalt,the EPU modified asphalt was prepared by in-situ polymerization with polycarbonate diol(PCDL)as the soft segment and diphenylmethane diisocyanate(MDI)and butanediol(BDO)as the hard segment.FTIR test was used to analyze the chemical composition of EPU modified asphalt.The penetration,softening point,ductility,and viscosity were used to evaluate the physical properties of the modified asphalt.The compatibility of modified asphalt was evaluated by softening point difference.Dynamic shear rheological test was used to investigate the high temperature rheological properties of modified asphalt.Differential scanning calorimetry and bending rheometer experiments were used to investigate the creep mechanism of modified asphalt at low temperature.The results show that EPU molecules react with asphalt molecules in asphalt to form transaction structures.The addition of EPU can effectively improve the physical properties and high temperature properties of asphalt,and the compatibility is good.EPU has a lower glass transition temperature,so EPU also shows excellent improvement effect on the low-temperature performance of asphalt.This study can provide a new idea for the production of EPU modified asphalt.
road engineeringenvironment-friendly polyurethanemodified asphalthigh temperature performancelow temperature performance
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