Hydraulic lime is a variety of slaked lime used to make mortar. It is produced by heating (calcining) limestone that contains clay and other impurities that enable it to set without exposure to air. It is used for providing a faster initial set in more extreme conditions (including under water). Calcium hydroxide is a chemical compound with the chemical formula Ca(OH)2. ... Mortar has several meanings: A mortar is a military weapon into which is dropped a mortar shell, which is then fired in a high ballistic trajectory. ... Calcination is the process of heating a substance, but below melting point, causing a loss of moisture. ... Limey shale overlaid by limestone. ... Clay is a generic term for an aggregate of hydrous silicate particles less than 4 Î¼m (micrometres) in diameter. ...
The Technology and Use of Hydraulic Lime, by John Ashurst
Calch Ty-Mawr Lime, The Welsh Centre for Traditional and Ecological Building
The signifcance of the clay content for the hydraulic properties of the hydrauliclime produced from a natural mixture of limestone and clay was discovered by the Englishman John Smeaton (1724-1792) when he was preparing to build the Eddystone lighthouse near Plymouth and was looking for a binder for water-resistant mortar.
Hydraulic cement was first invented by the Egyptians, and later reinvented by the Greeks and Babylonians, who made their mortar out of lime, much harder than the Roman mortars.
Eco-cement is a brand name for hydraulic and carbonating cements containing a high proportion of reactive magnesium oxide and another hyraulic cement such as Portland cement that carbonate in a porous substrate.
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