Page 134 - Mechanics of Asphalt Microstructure and Micromechanics

126 Ch a p t e r F o u r

micro-structure of asphalt mixtures and to predict their fracture energy density. The
predicted crack initiation and crack propagation patterns were found to be consistent
with observed cracking behavior. The results presented lead to the promising statement
that fracture energy density for mixtures is a fundamental fracture threshold and can be
both consistently measured and predicted for different laboratory test configurations.
In closing, the use of DIC in asphalt testing has been limited exclusively to the 2D,
planar, and surface measurement, although the technology provides the advantage of
non-contact and full-field displacement/strain measurement. More efforts therefore are
needed to evaluate the 3D stereo (surface) DIC measurement and the volumetric DIC
measurement to obtain more useful information of a specimen being tested. Technologies
and algorithms for these two prospective applications of DIC are ready to be evaluated.

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