User Manual ZFG 3.0
- 4-
1 Purpose
The dynamic plate load test with the help of the ZFG 3.0 light weight deflectometer (LWD) is a
rapid method of determining the dynamic deflection modulus Evd [MN/m²]. This allows
conclusions to be made about the load-bearing capacity and compaction of soils.
In accordance with German regulations TP BF-StB Part B8.3, the procedure can be used on
mixed-grained and course-grained soils up to a grain size of maximum 63 mm, loose base courses,
and backfill material and for soil improvement. It is used in civil and road construction. It is ideal
for documentation, self-monitoring and preparing reports.
When the compaction of very high compacted sub bases has to be measured, we recommend the
15 kg loading device. With its 1.5 times drop load, the measure limit is extended up to 105 MN/m²
The light drop weight tester can be used alternatively to static plate load device according to DIN
18 134, and has the following benefits:
• no necessity for a loaded truck as a required counter balance in the static plate bearing test or
the tripod required for settlement measurement
• testing facilities in restricted spaces, for example during rail track construction, trench
backfilling, for general backfill, in boreholes or other locations with difficult access
• low space requirements and low test equipment weight
• low time requirements for testing - around 3 minutes for each measuring point
Correlations between E
vd
and E
v2
can be found in Chapter 8 – Calibration.
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