General testing requirements and procedures for analysis of
Oynaflect data for pavement evaluation studies are
1. Pavement and air temperature data. Air and pavement surface temper
atures can be obtained at suitable intervals during Oynaflect
testing using handheld or pocket probe, thermister, thermocouple, or
other temperature measuring devices. The mean pavement temperature
can be determined by recording the temperature of oil poured into a
3/8- or 1/2-inch diameter hole drilled with a masonry bit into the
pavement within about a half-inch of the total thickness of the
asphalt concrete. One location for a segment of roadway may be
sufficient provided that solar radiation and wind effects are fairly
uniform and do not vary enough to alter the average temperature more
than +2F.
It is recommended that conventional pavement response measure
ments (e.g., Dynaflect) be obtained when pavement temperatures are
between 30F and 85F. High pavement temperatures may affect the
deflection measurements and make it difficult to achieve reliable
results. This is particularly true where binder viscosity and E1
are very low resulting in excessive volume changes near the loaded
area and erroneous deflection measurements.
2. Conduct Dynaflect tests at the desired interval (longitudinal dis
tance) with the sensors at locations conforming to those shown in
Figure F.l. Due to the potential for eccentric loading and varia
tions in pavement response for sensors 1 and 2, it is required that
the average value be used in the analysis.
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