volcanic ash mortar (Other Keyword)
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Lime preparation in ancient Roman architectural and marine mortars (2015)
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Romans prepared lime for the volcanic ash mortars of conglomeratic concretes using methods (Vitruvius, de Architectura 5.1.2-3) that are reflected in modern Italian lime industry terminology. In mortars of architectural concretes in Rome (1st C BCE–3rd C CE) builders mixed quicklime with freshwater to form stiff putty (grasello di calce) and then incorporated moistened scoriaceous ash, shown by an experimental reproduction. Pure calcite in unburnt particles (incotti) suggests pre-orogenic...