Page 75 - RoadCem Manual - PCT BV

Indicative test for soil organics
The organic matter can be determined in-situ. Mixing the ground with vinegar (or other acid) this will froth up if any organic matter is present. This simple test helps to show any organic material present.
No bubbles.
When no organic matter is present.
Few bubbles.
When relatively little organic matter is present.
Many bubbles.
Has relatively much organic matter present.
Figure 4.23 Indicative test determines organic content sub-base.
Determination of organic content
When the exact amount of organic material %m/m must be known this can be ascertained by a burning test. The loss of organic material m/m % is determined by using a test whereby the organic matter is burnt up and this can be done by heating the soil sample to 550 degrees Celsius. The difference in weight of the sample before burning and after burning will determine the mass percentage of organic matter in the soil.
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