3–4
ASPHALT SURFACE PREPARATION
Test site selection for asphalt surfaces is much the same as soils except that
preparation differs slightly. Voids may be filled on coarse, open-graded
mixes using soft sand or cement powder, taking care to fill only the voids
and leaving the asphalt bare for surface contact with the gauge base. The
base should be resting on the asphalt and not on the fill material.
Try to “rock” the gauge – if you can “rock” it, place more fill material or
move the gauge to a flatter surface to correct the problem; the gauge should
not rock. Put the source rod in backscatter position, making sure the rod is
in the proper index rod notch and not resting on the asphalt.
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