Since the dispersed phase uniformity of polymer modified asphalt plays a great role in the evaluation of modified asphalt compatibility,fluorescence microscopic images of styrene-butadiene-styrene block copolymer (SBS) modified asphalt were preprocessed in digitization.Then characteristic parameters of the dispersed phase in microscopic images were extracted through professional image processing and analysis software.Morishita index method,Poisson comparison method,Gini coefficient method and Christiansen coefficient method were adopted to estimate the dispersible uniformity of polymer modified particles.The comparison of the accuracy and rationality of several evaluation methods showed that Morishita index deviation and Christiansen coefficient are effective for the quantitative evaluation of polymer modified asphalt phase distribution uniformity.
