Troxler 3440 User Manual

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.

Troxler 3440 Specifications

General

Model	3440
Category	Measuring Instruments
Display	LCD
Power Supply	Rechargeable Battery
Measurement Type	Density and Moisture
Radiation Source	Cesium-137 and Americium-241
Application	Soil
Depth of Measurement	Up to 12 inches (300 mm)
Measurement Time	1 minute (standard)
Battery Life	Approximately 8 hours
Operating Temperature	14°F to 122°F (-10°C to 50°C)