Using Polymer Modified Asphalt Emulsions in Surface Treatments A ...

• DSR – DSR testing was performed in accordance with AASHTO TP5 on the unaged
binders to determine G* and δ values to assess early, high temperature
performance. With respect to surface treatments, the researchers believe
aggregate loss is of greater significance at high temperatures in surface
treatments, than are rutting or shoving;
• PAV-DSR – residues were long-term aged using PAV and then tested using the
DSR to assess intermediate temperature range performance. More specifically,
this test was intended to evaluate the potential for aggregate loss rather than
fatigue cracking;
• BBR – BBR testing was performed on long-term aged residues to evaluate low
temperature behavior. For this test, the fastest BBR loading time (8 sec.) was
used to simulate critical traffic loading conditions, rather than to gauge thermal
cracking per se (57).
The final recommended limiting values proposed for the SPG are presented in Table 4.
Table 4: Recommended SPG Limiting Values (57)
Viscosity DSR BBR
Creep Stiffness, TP1
ASTM D 4402
Max: 0.15; Min: 0.1 Pas
G*/Sin δ , Min: 0.750 kPa
Test Temp. @ 10 rad/s, °C
S, Max: 500 MPa
m-value, Min: 0.240
Test Temp., @ 8 s, °C
2.4.3 Evaluation of Existing Federal Lands Standards
The Standard Specifications for Construction of Roads and Bridges on Federal Highway
Projects (FP-03) calls for cationic and anionic emulsified asphalts to conform to
AASHTO M 208 and AASHTO M 140, respectively (63).
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