Ignition Loss and other Properties of Peats and Clays from Avonmouth, King's Lynn and Cranberry Moss

Synopsis Ignition loss, liquid limit and specific gravity have been measured on 28 samples of peats and clays from the coastal flats near Avonmouth, from the Fens near King's Lynn and from Cranberry Moss, a small raised bog in Co. Durham. The organic contents of nine of these samples have been determined and, for comparison, tests are reported on three inorganic clays from other sites. The investigations have shown that for peats and organic clays (containing more than about 10% organic matter) the ignition loss is a useful index property which can be correlated closely with organic content and specific gravity and, to a lesser degree, with liquid limit. It is also shown that 550°C is a suitable ignition temperature and that little advantage is gained by adopting temperatures lower than 105°C for determining the dry weight of peats. Ignition losses of the materials tested range from 3 to 99%. La perte au feu, la limite de liquidite et le poids specifique ont ete mesures pour 28 echantillons provennant des...