Classification tests

Bulk density

For the determination of bulk density, a representative section is usually taken from an undisturbed soil sample. A test sample is taken with a cutting ring. Subsequently, in accordance with the applicable standards or regulations, the bulk density is determined through weighing (moist and dry).

Water content

The water content is determined in accordance with the applicable standards or regulations.  A soil sample is, as much as possible, weighed in its initial state, dried and weighed again.  The moisture content is calculated by taking the quotient of both weightings.

Determination of the content of organic matter

The quickest determination is conducted in accordance with the glowing loss method. With this method, a portion of a soil sample, which is dried first, is weighed and subsequently put in a muffle furnace. The glowing loss is the weight difference before and after the glowing. The glowing loss represents the organic matter. This method can be conducted in accordance with a RAW (Rationalisation and Automation for Civil Engineering, Hydraulic Engineering and Road Engineering) regulation or NEN (Netherlands Standardization Institute) standard. Certain corrections in connection to the lutum content should still be done.

Determination of the organic matter content through rinsing with H2O2 is also a possible method that can be used.

Determination of the lime content

The glowing loss method in accordance with the RAW provision is also a quick and practical method for the determination of the lime content. The further glowing (for several hours) at a higher temperature after determining the organic matter content, is the correct method.

Rinsing with HCL (hydrochloric acid) will also provide an indication of the lime content. However, this method also removes other substances, in addition to lime.