caementum

caementum

caementum
Ancient Roman masonry formed of small rough stones set in a mixture of concrete.
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uti harena primum purissima asperrimaque paretur, caementum de silice frangatur negra-vius quam librarium, calce quam vehementissima mortario mixta ita ut quinque partes harenae ad duas respondeant.
John (Hospitallers) in the twelfth--thirteenth centuries, the hilltop fortification has masonry walls made with and without mortar, using the opus caementum technology (Roman concrete).