ATR	Attenuated Total Reflectance
ASTM	American Society for Testing and Materials
DSR	Dynamic Shear Rheometer
Ea	Apparent activation energy
FTIR	Fourier Transform Infrared Spectroscopy
MSCR	Multiple Stress Creep Recovery
Ref	Unmodified reference bitumen
SC4	Bitumen modified with 4 wt.% corn starch
SC6	Bitumen modified with 6 wt.% corn starch
SC8	Bitumen modified with 8 wt.% corn starch
η	Dynamic viscosity
Δη	Change in dynamic viscosity during bitumen aging
η(t)	Dynamic viscosity after t hours of aging
η(0)	Initial dynamic viscosity before aging
kη	Apparent rate constant of viscosity increase
IC=O	Carbonyl index
ΔIC=O	Change of carbonyl index during bitumen aging
IC=O(t)	Carbonyl index after t hours of aging
IC=O(0)	Initial carbonyl index before aging
${\mathrm{k}}_{{\mathrm{I}}_{\mathrm{C}=\mathrm{O}}}$	Apparent rate constant of carbonyl formation
IS=O	Sulfoxide index
ΔIS=O	Change in sulfoxide index during bitumen aging
IS=O(t)	Sulfoxide index after t hours of aging
IS=O(0)	Initial sulfoxide index before aging
kIS=O	Apparent rate constant of sulfoxide formation
IC=C	Aromaticity index
ΔIaromaticity	Change in aromaticity index during bitumen aging
Iaromaticity(t)	Aromaticity index after t hours of aging
Iaromaticity(0)	Initial aromaticity index before aging
kIaromatization	Apparent rate constant of the aromatization process
R	Percent recovery
ΔR3.2	Change in percent recovery during bitumen aging at a stress level of 3.2 kPa
R3.2(t)	Percent recovery after t hours of aging at a stress level of 3.2 kPa
R3.2(0)	Initial percent recovery before aging at a stress level of 3.2 kPa
kR3.2	Apparent rate constant of changes in percent recovery at a stress level of 3.2 kPa
Jnr	Non-recoverable creep compliance
Jnr(0)	Initial non-recoverable creep compliance before aging
ΔJnr3.2	Change in non-recoverable creep compliance during bitumen aging at a stress level of 3.2 kPa
Jnr3.2(t)	Non-recoverable creep compliance after t hours of aging at a stress level of 3.2 kPa
Jnr3.2(0)	Initial non-recoverable creep compliance before aging at a stress level of 3.2 kPa
kJnr3.2	Apparent rate constant of changes in non-recoverable creep compliance at a stress level of 3.2 kPa
εnr	Non-recoverable strain
εmax	Maximum strain during the creep phase
σ	Applied creep stress
A1700	Integrated absorbance of the carbonyl band at 1700 cm−1
A1030	Integrated absorbance of the sulfoxide band at 1030 cm−1
A1600	Integrated absorbance of the aromatic C=C band at 1600 cm−1
ΣA	Sum of integrated absorbance values used for FTIR index normalization
R2	Coefficient of determination
t	Aging time