Humboldt 5000 BLU Light Weight Deflectometer - Manual (Page 91)

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1) In accordance with ZTV E-StB 09 §14.2.5 and ZTV E-StB 12 client and contractor may agree upon these
reference values as benchmarks for verification of the achieved compaction.
To be on the save side always perform a correlation measurement with the static plate load test in accordance with DIN 18134.
The test must be performed and evaluated according to German standard TP BF StB Part B 8.3.
For general information only! All details are subject to change.
Benchmarks for the allocation of the static deflection modulus E
v2
or the
dynamic deflection modulus E
vd
to degree of compaction D
pr
on coarse-grained soil types
11. Standards
11.1 ZTV-E-StB 09 German Road and Transportation Research Association (Issue 2009)
‘..... 3.4.7.2 Requirements for deflection modulus
The requirements detailed below are based on the 10% minimum quantile. When constructing roads
corresponding to Construction Classes SV, or I to IV on frost-free subsoil or substructure, it is necessary to
obtain a deflection modulus of at least E
v2
= 120 MN/m 2 or alternatively E
vd
= 65 MN/m 2 on the subgrade.
For Construction Classes V and VI a deflection modulus of at least E
v2
= 100 MN/m 2 or alternatively
E
vd
= 50 MN/m 2 must be obtained. The deflection modulus E
v2
is to be verified through the static plate load
test, as defined in DIN 18134, and the deflection modulus Evd through the dynamic plate load test, as
defined in TP BF-StB Part B 8.3. If these requirements can be met only through compaction of the base
courses, which are to be laid on the subgrade, it will be sufficient to prove or assess, by separate
examination, a deflection modulus of at least E
v2
= 100 MN/m 2 or alternatively E
vd
= 50 MN/m 2 on the
subgrade for Construction Classes SV, or I to IV, and a deflection modulus of at least E
v2
= 80 MN/m 2 or
alternatively E
vd
= 40 MN/m 2 on the subgrade for Construction Classes V and VI. If the subsoil or
substructure is susceptible to frost, a deflection modulus of at least E
v2
= 45 MN/m 2 or alternatively
E
vd
= 25 MN/m 2 is necessary on the subgrade. For the scenarios outlined above, if the specifications of the
building contract do not state whether the static or dynamic deflection modulus is to be established, the
static deflection modulus should always be used. Alternatively, one can perform a calibration according
to TP BF-Stb Part E4, using the static deflection modulus to calibrate the dynamic deflection modulus.
Afterwards, the dynamic deflection modulus may be used as a requirement. If the deflection modulus
required on the subgrade cannot be achieved through compaction, it will be necessary to either
(1) improve or solidify the subsoil or substructure, or
(2) increase the thickness of the unbound base courses.
The measures must be listed in the specifications of the building contract.
D
pr
E
v2
E
vd
Soil Types
DIN 18 196
Gravels and sands with
≤ 7% by weight <0,063 mm
(gravels with wideor intermittent
grain size distribution, gravel-clay
and gravel-peat mixtures)
Gravels and sands with narrow
grain size distribution, sands
with wide or intermittent
grain size distribution
Mixed gravels and sands
with 7-15% by weight
<0,063 mm
(gravel-silt and gravel-clay mixtures,
sand-silt and sand-clay mixtures)
Silty and clayey as well as
mixed soils 15-40% by
weight <0,063 mm
(silt, clay, gravel-silt and gravel-clay
mixtures, sand-silt and sand-clay
mixtures)
Required compaction in
different depths
(ZTVT-StB 95*) (ZTVE-
StB 94)
Degree of compaction
D
pr
in %
≥ 103
≥ 100
≥ 98
≥ 97
≥ 100
≥ 98
≥ 97
≥ 100
≥ 97
≥ 97
≥ 95
Based on benchmarks for
the allocation to D
pr
(ZTVE-StB 84 Chart 8)
Deflection modulus
E
v2
in MN/m 2
≥ 120
≥ 100
≥ 80
≥ 70
≥ 80
≥ 70
≥ 60
≥ 70
≥ 45
≥ 45
≥ 30
1) Proposal for the
allocation of E
vd
to E
v2
(acc. ZTV-E StB, Oct. 09)
Deflection modulus
E
vd
in MN/m 2
≥ 65
≥ 50
≥ 40
≥ 35
≥ 40
≥ 35
≥ 32
≥ 35
≥ 25
≥ 25
≥ 20
ZTV E
StB 09
ZTV A
StB 12