Intermediate temperature cracking in HMA : phase 1 semi-circular bending (SCB) practicality evaluation.
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2017-02-01
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Alternative Title:Intermediate temperature cracking in hot mix asphalt : phase 1 semi-circular bending (SCB) practicality evaluation.
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Abstract:The Utah Department of Transportation has implemented a program to test the rutting and moisture
sensitivity of Dense Grade Asphalt. Under this program, asphalt mixes have become much harder and dryer in an
effort to minimize rutting potential. The result of this program is the creation of mixes which are susceptible to
cracking at intermediate and low temperatures. A test is being sought to help describe asphalt mix behavior in the
temperature range above freezing but below softening. Louisiana State University has proposed a test to analyze the
crack propagation energy in an asphalt mix using the semi-circular bending configuration. In this study, UDOT is
evaluating this test procedure by setting up two test systems, creating a spreadsheet for data analysis and comparing
the results of tests run on samples created in a single lab but performed in separate labs. The samples were created
from a virgin mix design with increasing binder content but constant voids. Test results from one of the labs ranked
the samples with increasing fracture propagation energy as binder content increased. Tests from the other lab
provided an unexpected ranking with a scattering of results. Further evaluation is required to identify the causes of
this anomaly.
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