Evaluation of dynamic shear rheometer tests for emulsions : research project capsule.
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2010-10-01
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Abstract:Currently, the Louisiana Department of Transportation and Development (LADOTD)
requires ductility tests at 25°C according to AASHTO T51 for emulsions and two
other tests, namely force ductility ratio at 4°C and elastic recovery at 10°C
according to AASHTO T300 and AASHTO T301, respectively, for polymer modified
emulsions. The fact that polymer modified asphalt is strain dependent creates
questions regarding purchase specifications based on constant strain controlled
tests. In developing performance grade (PG) specifications for emulsions, one of the
tests proposed in several reports is the multiple stress creep recovery (MSCR) test
according to ASTM D7405. This test determines percent elastic recovery and non-recoverable creep compliance and measures the damage behavior in the linear and
nonlinear range. Compared with the current binder protocol, a repeated creep tests
protocol (or some other method that varies the frequency and strain and measures
the accumulated permanent strain of the binder) represents an improvement in the
theoretical and practical concepts that will better rate the binder properties related
to performance.
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