Study on high temperature performance of diphenyl-methane-diisocyanate(MDI)modified asphalt and its mixture
Modified asphalt and its mixtures with 3%MDI,5%MDI and 7%MDI were prepared.The high-temperature performance of MDI modified asphalt and its mixtures with different dosages was studied through dynamic shear rheological tests and rutting tests.The results showed that the addition of MDI modifiers increased the viscoelasticity and softening point of the matrix asphalt,and reduced the penetration index.The addition of MDI modifiers with different dosages increased the rutting factor index G*/sinδ of the asphalt and dynamic stability value of the asphalt mixture.When the rutting factor rindex G*/sinδ was 2.2kPa,the critical temperature corresponding to 7%MDI modified asphalt was the highest,and it had the greatest improvement about the dynamic stability value of asphalt mixtures.7%MDI modified asphalt and its mixture were suitable for asphalt pavement design and application in relatively higher temperature environments.
road engineeringpolymer modified asphalthigh temperature performanceMDI
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