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Crushed Terracotta for Cocciopesto, Coarse and Fine
Broken pottery, tile or brick, crushed and mixed with lime, made the Roman waterproof mortar opus signinum (cocciopesto), used for baths, aqueducts and cisterns. Pliny says the broken pottery was beaten to powder. Crush fired brick or tile and sieve it into a coarse grade and a fine powder.
The picture: a fragment of Roman pavement, broken pottery set in lime.
初学者
Half a day
说明
1
1
Break it up
Break it up
Put fired bricks or tile pieces in a sack and break them with the sledgehammer into pieces smaller than a walnut. Wear glasses.
此步骤所需材料：
烧结黏土砖3 个所需工具：
黄麻布袋
大锤
安全眼镜2
2
Sieve the coarse grade
Sieve the coarse grade
Shake the crush through the sieve. What passes is the coarse grade; what stays goes back in the sack to be crushed again.
所需工具：
粗筛
水桶3
3
Pound to powder
Pound to powder
Pound some of the coarse grade in the mortar and shake it through the fine sieve. What passes is the fine powder.
所需工具：
石制研钵与研杵
细目筛水桶安全眼镜4
4
Store
Store
Keep each grade dry in its own bucket, ready to mix with lime.
所需工具：
水桶5
5
Sorting the crush
Sorting the crush
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