Comparison of Ev2 and Evd

 

Only for information, specification without guarantee

Correlations Ev2 / Evd  Ev2 - deformation modulus (static plate loading test) Evd - dynamic deformation modulus (Light Drop Weigth tester) Requirement of the ZTVE-StB76

Suggestion for new limit values

E v 2 in MN / m² 180

E v d in MN / m² 80

150

70

120

55

100

45

80

40

60

30

45

25

20

15

Appendix to the regulation "ZTVE-StB94, Abschn 3,4,7,2, dec. 94" The requirements mentioned refer if to no theother 10% minimum quantile of the dynamic deformation modulus, object-oriented correlations are present for the static deformation modulus Ev2: For road superstructure of the building class SV, I to IV on nonfreezing subgrade or substructure a dynamic deformation modulus of at least Evd = 60 MN/m² with the building class V and VI Evd = 50 MN/m² is on the subgrade level required. If these requirements can be fulfilled only by compacting the subgrade layers, for a building class SV or I to IV on the subgrade level a dynamic deformation modulus of at least Evd = 50 MN/m² and with a building class V and VI Evd = 40 MN/m² is sufficient. In the case of doubt the dynamic deformation modulus is measured on the subgrade level after installation of the road base in boreholes or in dig holes. With frost-sensitive sub-layers a dynamic deformation modulus of at least Evd = 25 MN/m² is on the subgrade level required (in case of soil exchange, with the appropriate response time in mind: Evd = 30 MN/m² )

 

Only for information, specification without guarantee

 Bearing capacity checks suggested appendix to Regulation: "Roads and earthwork ZTV E-STB 76" Construction layer

Condition

Ev2 (MN/m²)

Subgrade level

generally

>45

(planum)

fine-grained

Evd

Dpr % Proctor

>25 <2,0

mix-grained

>45..20

Rock pourings coarse grained soils

Ev1/Ev2

<3,0

>25..15

<4,0

Gravel GW (far graduated)

>120

>55

>103

Gravel GI (intermittently)

>100 >80

>45 >40

>100 >97

Gravel GE (narrow graduated)

>80

>40

>100

Sand SE-SW-SI

>60 >45

>30 >25

>97 >95

Standard values for the assignment of compaction level Dpr (Proctor) and deformation modulus Ev2 sub layers

Level of compaction Dpr in %

GW, GI

≥

100 ≥ 98 ≥

GE, SE, SW, SI

97

Deformation Evd   modulus Ev2 in  MN/m²  MN/m² 100 > 80 > 70

≥

80 ≥ 70

≥

60

≥

≥

100 ≥ 98

≥

97

≥

≥

≥

Ev2/Ev1

45 ≥ 40

≥

35

≥

≥

40 ≥ 35 30

requirement of the ZTVE STB 76 Ev2 in MN/m²

Limit values Evd in MN/m²

180 150 120 100 80 60 45 20

80 70 55 45 40 30 25 15

2,3 ≥ 2,5 2,6

 

Only for information, specification without guarantee

 

Baustoff und Bodenpruefstelle Wetzlar

Fill from line ditches Quality assurance of the compaction with the Light drop weight tester in accordance with TP BF StB part of 8.3 Reference values for the relation of Degree of compaction (Proctor) D pr Dynamic deformation modulus Evd Required compaction in different levels of depth (ZTVT StB 95 *) (ZTVE StB 94)

Appoximate values for the relation to Dpr (ZTVE StB 94 Tab. 8)

1)Suggestion for 1)Suggestion the relation of Evd to Ev2 (in accordance with FGSV working group "testing devices", status Okt.96)

sub-layer

Degree of compaction Dpr

Deformation modulus Ev2

Deformation modulus Evd

DIN 18196

%

MN/m²

MN/m²

GW, GI (e.g. stone soil or mineral mixture 0/32)

≥

GE, SE, SW, SI

≥

mixed- and finegrained soils

≥

103 ≥ 100

≥

120 ≥ 100

≥ ≥

60 50

≥

98

≥

80

≥

40

≥

97

≥

70

≥

35

100 ≥ 98 ≥ 97

≥

80 ≥ 70 ≥ 60

≥

100 ≥ 97

≥

45 ≥ 30

≥

20

≥

≥

95

≥

40 ≥ 35 ≥ 32 25 ≥ 15 10

1) These reference values are approximate values for the proof of the achieved compaction in accordance with. ZTVE StB 94, exp. 14.2.5.. These reference values can be agreed upon between contractors and orderers.