Difference between revisions of "Hydraulic lime"

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== Description ==
 
== Description ==
  
A type of [http://cameo.mfa.org/materials/fullrecord.asp?name=lime lime] ([http://cameo.mfa.org/materials/fullrecord.asp?name=calcium%20oxide calcium oxide]) that hardens by the chemical reaction with water. Hydraulic cements composed of lime and volcanic ash (pozzolana) were first used in ancient Greece and Rome. The mixture must contain at least 12% of a silicate/aluminate component such as [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay], [http://cameo.mfa.org/materials/fullrecord.asp?name=calcium%20silicate calcium silicate] (portland cement), calcium-aluminate, [http://cameo.mfa.org/materials/fullrecord.asp?name=oxychloride%20cement magnesium oxychloride], [http://cameo.mfa.org/materials/fullrecord.asp?name=pozzolana pozzolana], [http://cameo.mfa.org/materials/fullrecord.asp?name=slag slag], barium silicate/barium aluminate, brick dust, volcanic ash, [http://cameo.mfa.org/materials/fullrecord.asp?name=pumice pumice], etc. These may be present as original components in the burnt limestone or as additives. In water, the lime mixture hardens to a water resistant solid due to complex exothermic chemical changes involving the hydration of calcium silicates and aluminates.  
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A type of [[lime]] ([[calcium oxide]]) that hardens by the chemical reaction with water. Hydraulic cements composed of lime and volcanic ash (pozzolana) were first used in ancient Greece and Rome. The mixture must contain at least 12% of a silicate/aluminate component such as [[clay]], [[calcium silicate]] (portland cement), calcium-aluminate, [[oxychloride cement|magnesium oxychloride]], [[pozzolana]], [[slag]], barium silicate/barium aluminate, brick dust, volcanic ash, [[pumice]], etc. These may be present as original components in the burnt limestone or as additives. In water, the lime mixture hardens to a water resistant solid due to complex exothermic chemical changes involving the hydration of calcium silicates and aluminates.  
  
Examples are: [http://cameo.mfa.org/materials/fullrecord.asp?name=Roman%20cement Roman cement], and [http://cameo.mfa.org/materials/fullrecord.asp?name=portland%20cement portland cement].
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Examples are: [[Roman cement]], and [[portland cement]].
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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° John Ashurst "The Technology and Use of Hydraulic Lime" Building Conservation Directory 1997: [http://www.buildingconservation.com/articles/lime/hylime.html Link] -(contains specifications and characteristics of different mixture compositions)
 
° John Ashurst "The Technology and Use of Hydraulic Lime" Building Conservation Directory 1997: [http://www.buildingconservation.com/articles/lime/hylime.html Link] -(contains specifications and characteristics of different mixture compositions)
  
== Authority ==
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== Sources Checked for Data in Record ==
  
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 454
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 454

Revision as of 06:25, 1 May 2016

Description

A type of Lime (Calcium oxide) that hardens by the chemical reaction with water. Hydraulic cements composed of lime and volcanic ash (pozzolana) were first used in ancient Greece and Rome. The mixture must contain at least 12% of a silicate/aluminate component such as Clay, Calcium silicate (portland cement), calcium-aluminate, magnesium oxychloride, Pozzolana, Slag, barium silicate/barium aluminate, brick dust, volcanic ash, Pumice, etc. These may be present as original components in the burnt limestone or as additives. In water, the lime mixture hardens to a water resistant solid due to complex exothermic chemical changes involving the hydration of calcium silicates and aluminates.

Examples are: Roman cement, and Portland cement.

Synonyms and Related Terms

chaux hydraulique (Fr.); cal hidráulica (Port.); hydraulic cement

Additional Information

° John Ashurst "The Technology and Use of Hydraulic Lime" Building Conservation Directory 1997: Link -(contains specifications and characteristics of different mixture compositions)

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 454
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996

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