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- W198280280 abstract "Several researchers investigated the use of dynamic shear rheometer (DSR) based tests to replace elastic recovery test using a ductility bath for performance graded (PG graded) modified asphalt binders. Some studies reported good correlation between percent recovery of multiple stress creep and recovery (MSCR) test (AASHTO TP70) and elastic recovery of AASHTO T301 using a ductility bath for PG binders. In this study, DSR based rheological tests of 20 different asphalt emulsion residues were performed and its relationships with elastic recovery (AASHTO T301) were investigated. Out of 20 emulsions, 8 are hard pen base asphalt emulsions of which 2 are polymer modified. Out of 12 non-hard pen base asphalt emulsions, 6 are polymer modified. In strain sweep test from 2% to 52%, it was observed that emulsions prepared of hard pen base asphalt have relatively lower strain tolerances. Using frequency sweep data, complex modulus master curves were constructed at 25°C for overall rheological behavior. Temperature sweep of phase angle from 52°C to 94°C showed that maximum phase angle in the range of 75° to 85° may be used as a criterion for polymer identification. Burgers model parameters were obtained through fitting of 1st creep and recovery cycle and two parameters, Maxwell viscosity and Kelvin viscosity were investigated for polymer identification. From multiple stress analyses, it was observed that the relationship between creep stress and percent recovery (MSCR) is negative and logarithmic. Finally, the highest coefficient of determination of linear correlation was obtained between MSCR percent recovery at 10°C and elastic recovery (AASHTO T301) at 58°C. Coefficient of determination, R2 values obtained for 0.1 kPa and 3.2 kPa creep stresses are 0.961 and 0.938, respectively. Therefore, MSCR at 10°C has been recommended as a criterion for polymer identification. At 0.1kPa creep stress, a minimum percent recovery of 25 and at 3.2kPa, a minimum percent recovery of 9 is recommended to identify the presence of polymer." @default.
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- W198280280 date "2013-01-01" @default.
- W198280280 modified "2023-09-24" @default.
- W198280280 title "Rheology of Asphalt Emulsion Residues and Its Relationship to Elastic Recovery in AASHTO T301" @default.
- W198280280 hasPublicationYear "2013" @default.
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