The nature, identity and physical characteristics of the component particles of 14 representative British fly ashes have been studied, with the purpose of relating them to the pozzolanic properties of the ashes. In this paper data are presented on the chemical and mineralogical analyses, specific surfaces and particle size distribution of the ashes. The particles have been classified into characteristic types by microscopical examination, and centrifugal float‐and‐sink methods of density separation have been used to study the distribution of these types in the various ashes. The mineralogical origin of the particles is studied by comparing them with particles produced by passing particles of representative coal minerals through a flame.
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Watt et al. (1965) studied this question.
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