Influences of two binder materials on performance of cold recycled mixtures stabilized with foamed asphalt

By means of accelerated loading test, low temperature bending test and Cantabro test, the influences of two binder materials, including foamed asphalt and cement, on the high temperature deformation resistance, low temperature crack resistance and raveling resistance of cold recycled mixtures stabilized with foamed asphalt (CRMFA) were studied. The results indicate that there exists an optimum dosage of foamed asphalt to acquire good high temperature deformation resistance of CRMFA. The increase of cement content is conducive to boosting the high temperature deformation resistance of CRMFA. The low temperature flexibility of CRMFA increases with the increase of foamed asphalt content, but assumes parabolic relationship with the increase of cement content. To insure the favorable low temperature crack resistance, the dosage of cement is recommended to be less than 2wt%. The raveling resistance of CRMFA is poor and the increase of foamed asphalt content helps to effectively reduce the raveling resistance of CRMFA. The improvement of raveling resistance for CRMFA becomes non-significant while the addition content of cement increases to 1.5wt%-2.5wt%.