Lime Mortar James Powell - Conservation Consultant - - PowerPoint PPT Presentation

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Lime Mortar James Powell - Conservation Consultant - - PowerPoint PPT Presentation

Aug 17, 2023 209 likes •452 views

Lime Mortar James Powell - Conservation Consultant james@jamespowell.ie Carbonation Drying, the mortar must dry enough to allow air in. CO2 from the atmosphere diffuses into water in the pores in the masonry. (So the masonry must be

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Lime Mortar

James Powell - Conservation Consultant james@jamespowell.ie

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Carbonation

  • Drying, the mortar must dry enough to allow air in.
  • CO2 from the atmosphere diffuses into water in the pores in

the masonry. (So the masonry must be neither too dry, as you need water in the pores, nor saturated, so CO2 can get in)

  • Carbonic Acid forms from the dissolved CO2 which reduces the

ph of the water in the pores, making it slightly acidic

  • The acidity causes dissolution of highly alkaline Ca(OH)2

(Calcium hydroxide) into the water in the pores

  • A reaction then takes place between the Calcium ions from the

lime and the Carbonate ions from CO2 to form CaCO3 (Calcium Carbonate) in solution

  • The dissolved Calcium Carbonate is then deposited on the solid

material around the pores binding it together.

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Diphoterine.

available in Ireland from www.innovection.net 01 642 4211