“After slaking it, mix your mortar”

— Vitruvius , book De architectura

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter V "Lime" Sec. 1
Context: With regard to lime we must be careful that it is burned from a stone which, whether soft or hard, is in any case white. Lime made of close-grained stone of the harder sort will be good in structural parts; lime of porous stone, in stucco. After slaking it, mix your mortar, if using pitsand, in the proportions of three parts of sand to one of lime; if using river or sea-sand, mix two parts of sand with one of lime. These will be the right proportions for the composition of the mixture. Further, in using river or sea-sand, the addition of a third part composed of burnt brick, pounded up and sifted, will make your mortar of a better composition to use.

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Vitruvius 203

Roman writer, architect and engineer -80–-15 BC

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