Engineering properties of peat and organic soils - Geotechnics of Organic Soils and Peat - page 73

Figure 3.22 Organic content vs. liquid limit ( after Kazemian et al ., 2009).
Figure 3.23 Natural water content vs. dry density ( after Al-Raziqi et al ., 2003).
As shown in the graph, the densities of peat soils are significantly lower compared
with those of mineral soils because of the presence of organic matter. In this case both
tropical and temperate peat show a very close fit.
3.13.5 Specific gravity vs. organic content (loss of ignition)
Figure 3.24 shows the graph of specific gravity versus loss on ignition for peat soils.