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Encyclopedia > Hydraulic lime

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 μm (micrometres) in diameter. ...

External links

  • The Technology and Use of Hydraulic Lime, by John Ashurst
  • Calch Ty-Mawr Lime, The Welsh Centre for Traditional and Ecological Building

  Results from FactBites:
Lime mortar - Wikipedia, the free encyclopedia (755 words)
Non-hydraulic lime is produced by the heating of sufficiently pure limestone (calcium carbonate) to between 954° and 1066°C to produce quicklime (calcium oxide).
Lime putty, however, is always non-hydraulic and as the name suggest is in the form of a putty.
Lime mortar is not as strong in compression as OPC mortar, nor does it adhere as strongly to the masonry as OPC.
Cement - Wikipedia, the free encyclopedia (1453 words)
The signifcance of the clay content for the hydraulic properties of the hydraulic lime 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.
  More results at FactBites »



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