Prediction of Dynamic Modulus of Hot Mix Asphalts with Reclaimed Asphalt Pavement
Table 2
Performance grade and viscosity of blended binders.
Performance grade
Binder type
High critical temperature (°C)
Low critical temperature
High and low critical temperature
Superpave PG grade
Unaged
RTFO-aged
m value
S value
PG 64-22
64.9
64.8
−24.1
−26.6
64.8, −24.1
PG 64-22
RAP
98.1
99.2
−14.6
−20.2
98.1, −14.6
PG 94-10
PG 64-22 + 10% RAP
69.6
69.5
−23.1
−25.9
69.5, −23.1
PG 64-22
PG 64-22 + 25% RAP
73.1
72.8
−19.8
−22.3
72.5, −19.8
PG 70-16
PG 64-22 + 40% RAP
77.8
78.2
−16.8
−18.5
77.8, −16.8
PG 76-16
Viscosity data (MPa·s) at different temperatures
Binder type
Aging condition
135°C
150°C
165°C
180°C
PG 64-22
Unaged
424
219
125
79
RTFO-aged
595
260
156
88
RAP
Unaged
3838
1438
613
300
RTFO-aged
N/A
N/A
N/A
N/A
PG 64-22 + 10% RAP
Unaged
450
225
125
75
RTFO-aged
610
265
159
90
PG 64-22 + 25% RAP
Unaged
588
292
152
100
RTFO-aged
1124
445
333
135
PG 64-22 + 40% RAP
Unaged
1023
594
290
160
RTFO-aged
2412
1071
554
276
BBR tests on the RAP binder were conducted under “As-Is” condition as it already went through oxidative hardening in its service life. Rotational viscosity test was not conducted on the RAP binder under the RTFO-aged condition.
