Geoscience Reference
In-Depth Information
The table applies for sub - base materials with a laboratory soaked CBR value of
less than 30% with a value of E
=
150MPa.
These values apply in the back-analysis of an existing pavement system.
Cover material is either asphalt or cemented material or a combination of these
materials.
13.24 Equivalent modulus of sub bases for high standard
base material
As above for normal base material.
The table applies for sub - base materials with a laboratory soaked CBR value
greater than 30% with a value of E
=
210MPa used.
Table 13.24 Selecting of maximum modulus of sub - base materials (Austroads, 2004).
Thickness of
Suggested vertical modulus (MPa) of top sub-layer of high standard base material
overlying
material
Modulus of cover
1000
2000
3000
4000
5000
material (MPa)
40 mm
500
500
500
500
500
75 mm
500
500
480
460
440
100 mm
500
450
410
390
360
125 mm
450
390
350
310
280
150 mm
400
330
280
240
210
175 mm
360
270
210
210
210
200 mm
310
270
210
210
210
225 mm
260
210
210
210
210
250 mm
210
210
210
210
210
Cover material is either asphalt or cemented material or a combination of these
materials.
Figure 13.3 Equivalent modulus.
 
 
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