Evaluating the Physical and Rheological Properties of Rejuvenated Styrene-Butadiene-Styrene-Modified Asphalt Binders
Table 2
The principal properties of rejuvenators Types I, II, and III.
Properties
Methods
Rejuvenators
Type I
Type II
Type III
Test on emulsions
Viscosity at 25°C (SFS)
ASTM D7496
25∼150
20∼60
25∼150
Residue (%)
ASTM D6934
>64
60∼65
>64
Miscibility test
ASTM D6999
Nonseparation
Nonseparation
Nonseparation
Sieve test (%)
ASTM D6933
<0.1
<0.1
<0.1
Particle charge test
ASTM D7402
Positive
Positive
Positive
Cement mixing test (%)
ASTM D6935
<2
<2
<2
Pumping stability1
Pass
Pass
Pass
Tests on residue from distillation test
Viscosity at 60°C (cSt)
ASTM D2170
1000∼4000
200∼500
1000∼4000
Asphaltenes (%)
ASTM D2007
<11.2
2∼4
<11
Maltene distribution ratio (PC + A1)/(S + A2)2
ASTM D2007
0.8∼1.5
0.5∼0.9
0.7∼1.1
PC/S ratio2
ASTM D2007
>1.2
>1.2
>0.5
Note: 1: pumping stability is tested by pumping 475 mL of rejuvenators, diluted one part concentrate to one part water, at 25°C, through a 6 mm gear pump operating 1750 rpm for 10 minutes with no significant separation or coagulation. 2: PC is a polar compound; A1 is the first acidaffins; A2 is the second acidaffins; S is the saturated hydrocarbons.
