This test is simpler and more rapid than the CBR test and can be easily applied for insitu field test.

 

This was developed by North Dakota Highway Deptt.

 

For use with pavement design method similar to that associated with CBR test.

 

Specifications:

 

The instrument consists of a rod carrying a loading platform at the top and a hardened steel cone at the bottom.

 

The rod is mounted vertically and slides freely up and down in the collars of the frame and can be locked in any position as required.

 

The conical tip penetrates the soil through an aperture in the cast iron base.

 

The loading platform.

 

Carries a graduated plunger which enters one of the side supports and permits the reading of the penetration correct to 1 mm, Supplied with set of weights consists 7 nos. 5 kg weight and one hardened steel cone.