 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 600 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 kit includes the sliding mass assembly,
mm scale to measure penetration, 25 single use cones, data reduction
program diskette and instruction manual. The Dual Mass Cone Penetrometer
includes a dual mass hammer assembly, mm scale, assorted hand
tools, 25 single use cones, data reduction program diskette and
manual.
 |
|
S-216
|
Single-Mass
COE Cone Penetrometer
|
| S-218 |
Dual-Mass
COE Cone Penetrometer
|
Related Item:
Dynamic Cone Penetrometer |
