Case DV36, DV45, DV45CC Roller Repair Manual

Manuals: Service Manual
Introduction
Maintenance
Engine
Hydrostatic Drive
Brakes and Controls
Hydraulic System
Frames and Ballasting
Steering
Wheels
Electrical System
Tools
Platform, Cab, Bodywork and Decals
Manual Extract: Compacting – Stiffness reference values
Cold minerals
To be able to evaluate the kB values, it is important to know that a sub-grade for a main road or motorway must have a stiffness value up to 100 kB
On a gravel surface, a good stiffness value will be greater than 80 kB.
For gravel layers in a pavement structure or in a frost sub-base, good stiffness values will be between 50 kB and 80 kB.
Expect stiffness values of less than 50 kB after the humus layer is removed from a clayish, very sandy, or wet ground.
Asphalt
Asphalt has a temperature-dependent stiffness. The stiffness increases as the pavement cools.
It is important that compaction takes place only in the compactible temperature range of 140 – 80 °C (284 – 176 °F).

Regardless of the material (gravel or asphalt, the base layers or paving layers), the increase of the stiffness in kB is an important indicator for compaction tasks. As long as ACE Force detects an increase in stiffness the surface is not at its maximum compaction value. An increase in kB value is always accompanied by an increase of compaction and the load-bearing capacity.

Once you are at the maximum compaction, the kB value will no longer increase and instead have a tendency to decrease. This is the ideal moment to stop compaction. At this point, the material is at its highest possible stiffness.