Troxler RoadReader Plus 3450, Manual Of Operation And Instruction

Page: 59 / 201

4–6
PREPARING A TEST SITE
To ensure measurement accuracy, properly prepare the test site
before taking gauge measurements. This section describes how to
prepare test sites properly for soil and asphalt measurements.
SOIL SITE
✓
Locate a smooth site on the soil free from any large holes,
cracks, or debris.
✓
If necessary, smooth the surface by moving the scraper plate in
a back and forth motion.
✓
Fill any voids or depressions with fine sand. Strike off any
excess fill.
✓
Place the scraper plate back on the surface and press down
slightly to level the surface.
✓
For direct transmission measurements:
✓
Put the drill rod through the extraction tool and then through
one of the guides on the scraper plate (Figure 4–2).
✓
Wear safety glasses and a radiation dosimeter.
✓
Place the drill rod assembly on the test site.
✓
Step on the scraper plate.
✓
Hammer the drill rod at least fifty millimeters (2 in.) deeper
than the desired test depth. The drill rod increments include
the additional depth.
✓
Mark the test area before removing the drill rod to ensure the
gauge is placed over the same area as the scraper plate (Figure
4–3).
CAUTION
Under no circumstances should the source rod of the
gauge be used to drill holes.