User Manual ZFG 3.0
- 22-
9 Correlations
For information purposes only, no guarantee of information correctness
Quote from German ZTVE- STB 09, Research Institute for Road and Traffic (Edition 2009)
4.5.2 Requirements for deflection modulus
The information provided below is based on the 10% minimum quantile.
When constructing roads of Construction Classes SV and I to IV (see A & B tables) on frost-
protected substrate or substructure, then the following deflection modulus of at least
Ev2 = 120 MN/m² or alternatively Evd= 65 MN/m²
and for Construction Classes V and VI a deflection modulus of at least
Ev2 = 100 MN/m² or alternatively Evd = 50 MN/m²
is necessary.
The deflection modulus Ev2 is to be verified in accordance with a static plate load test in
accordance with DIN 18134 and the deflection module Evd with a dynamic plate load test in
accordance with TP BF Part B 8.3.
When the requirements were meet, through compaction of the sub bases on the planum, it is
sufficient to achieve a deflection modulus on the planum of at least
Ev2 = 100 MN/m² or alternatively Evd= 50 MN/m²
and for Construction Classes V and VI a deflection modulus of at least
Ev2 = 80 MN/m² or alternatively Evd= 40 MN/m².
In the case of frost-sensitive substrate or substructure, a deflection modulus of at least
Ev2 = 45 MN/m² [or alternatively Evd= 25 MN/m²]
is required on the planum.
After improving the soil and in the case of frost-sensitive substrate or substructure, a deflection
modulus of at least
Ev2 = 70 MN/m² [or alternatively Evd= 40 MN/m²]
is required on the planum.
If the specifications do not specify whether the deflection modulus is static or dynamic, it must be
verified for cases stated in this section; verification should always take place using the static
deflection modulus.
If the required deflection modulus cannot be achieved on the planum through compaction, either
1. the substrate or substructure must be improved or consolidated, or
2. the thickness of the loose sub bases must be increased.
These activities or locale experiences must be stated in the specifications.
Quotes of former ZTVE
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