| The U.S. Army Corps of Engineers has developed two
cone penetrometers to measure CBR values from 1 to 100. These devices
are similar to the one used in South Africa since the 1970s. The
dual mass version drops an 8 kg mass a distance of 575 mm onto
an anvil driving a 60° cone with a maximum diameter of 20 mm. When
used in weaker subgrades having a CBR value less than 10, a part
of the driving mass is removed resulting in a 4.6 kg falling mass.
The cone penetration caused by one blow of the 8 kg mass is essentially
twice that caused by the 4.6 kg mass. Typical blow counts for 25
mm increments are recorded. The Corps has developed a correlation
between CBR and mm/blow (referred to as the Penetration Index).
The Single Mass Cone Penetrometer has a fixed 8 kg mass and
is recommended for pavement sections with anticipated CBR values
between 10 and 100.
The Single-Mass Cone Penetrometer kit (S-216) includes the Upper Assembly w/ 8 kg hammer, 37.75 in hardened point, oil, wrenches, pens and user's manual with CD.
The Dual-Mass Cone Penetrometer
includes a dual-mass hammer assembly, 30 in drive rod, 40 in vertical scale w/ foot and upper attachment, hardened point. cone adapter, 25 disposable cones, assorted hand tools, carrying case, user’s manual and CD.
| Model |
Description |
| S-216 |
Single-Mass
COE Cone Penetrometer |
| S-218 |
Dual-Mass
COE Cone Penetrometer |
Related Item:
Dynamic Cone Penetrometer |
