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Long-Slaked Lime for Stucco, Proved with the Hoe Test (Vitruvius, Book VII)
Vitruvius's rule for stucco lime: slake the best lump lime in water a good while before use, so under-burnt lumps finish slaking in the pit instead of blistering on the wall, then prove it with a hoe: lime that sticks to the iron like glue is fully tempered.
Beginner
A good while of slaking (he gives no time), then minutes to test
Instructions
1
1
Read Vitruvius
Read Vitruvius
"This will be all right if the best lime, taken in lumps, is slaked a good while before it is to be used."
2
2
Slake the lumps
Slake the lumps
Put the best lump lime in the mortar bed and slake it in water (ours: cover it and keep it covered with water). Leave it a good while: any lump not burnt long enough in the kiln throws off its heat in the long slaking and comes to the same consistency.
Materials for this step:
Quicklime1 piece
Water1 pieceTools needed:
Mortar Box
Shovel
Bucket3
3
Hoe test
Hoe test
Chop into the slaked lime with a hoe as if hewing wood. Sticks in bits: not yet tempered, wait. Iron comes out dry and clean: the lime is weak and thirsty. Sticks to the tool like glue: rich and fully tempered, ready for stucco.
Tools needed:
Hoe4
4
Troubleshooting
Troubleshooting
Stucco lime troubleshooting.
Flow
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5
5
History and honest limits
History and honest limits
From Vitruvius, **The Ten Books on Architecture**, Book VII ch. II, tr. M. H. Morgan (1914), pp. 204-205 (checked on the archive.org scan vitruviustenbook00vitruoft). He gives no slaking time and no water amount; keeping the lime under water and the safety notes are ours.
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