Comparative evaluation of rheological properties and micromechanics of non-foamed and foamed asphalt mastic
Department of Civil and Environmental Engineering
Foamed warm asphalt has become an effective option to common asphalt technologies. It is quite significant for foamed asphalt to be used widely with regard to the mechanical investigation of foamed asphalt mastic. The objective of this study is to explore the rheological properties of non-foamed (base) and foamed asphalt mastics with different filler-binder ratios completely, by using the dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests, respectively. Also, the influence of filler-asphalt ratio on the high and low temperature performance of the base and foamed asphalt mastic was analyzed, and the effectiveness of time-temperature superposition principle was discussed for the foamed asphalt mastic. The master curves of base and foamed asphalt mastic were established and then the master curve was used for that to perform a rheological properties analysis over a wide range of temperatures and frequencies. In addition, this study investigated the micromechanics of the base and foamed asphalt mastic by using direct microstructure observations and thermal property testing, including scanning electron microscope (SEM) and differential scanning calorimeter (DSC). It was found that the addition of mineral filler into the foamed asphalt exhibited a significant influence on the high and low temperature performance. The time-temperature superposition principle can be employed in the foamed asphalt mastic. The foamed asphalt mastic showed better high temperature performance than the base asphalt mastic over a wide range of frequency. The low temperature PG grade of the foamed asphalt mastic indicated a favorable consistency with that of the base asphalt mastic. The distribution of filler in the base asphalt mastic was inferior to that in the basic asphalt mastic. The thermal stability of foamed asphalt mastic performed an obvious increase as compare to that of base asphalt mastic.
Construction and Building Materials
Comparative evaluation of rheological properties and micromechanics of non-foamed and foamed asphalt mastic.
Construction and Building Materials,
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