Study on Rut Resistance Performance of Crumb Rubber Petroleum Resin Compound Modified Asphalt
To investigate the effect of petroleum resin on crumb rubber modified asphalts,different contents of Crumb Rubber(CR)and Petroleum Resin(PR)modifiers were designed,and CR/PR composite modified asphalts were prepared.Considering the two asphalt ag-ing states of non-aging and short-term aging,the shear rheological properties and creep recovery properties of the composite modified asphalts were tested respectively,and the high-temperature rutting resistance was evaluated.It is found that with the increase of CR content and the addition of PR,the rutting resistance of composite modified asphalts was constantly improved.At the same time,the re-sults of variance analysis also prove the improvement effect.Compared with the base asphalt,the rutting factor of compound modified asphalts was increased by nearly one time,and the recovery rate was increased by around ten times.Therefore,the asphalt materials produced with these two modifiers can ensure that rutting is not easy to occur under high pavement temperature.According to the re-sults of multiple stress creep recovery test,higher content of CR had better rutting resistance in terms of elastic properties.Further addi-tion of PR will also significantly reduce the unrecoverable creep compliance value.Although the addition of PR has no obvious positive effect on the creep recovery rate of modified asphalts,considering some potential test errors,it can be considered that the PR was effec-tive in improving the elastic properties of asphalt.
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