| Jagged edges |
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Irregularities left on the edges of the tile due to the use mainly of hand cutting tools.
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| Jasper ware |
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A vitreous, opaque, colored unglazed ceramic ware having white or contrasting relief-decorations and containing a substantial amount of barite. Originally developed by Josiah Wedgwood. (ASTM C 242).
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| jiggering |
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Forming ceramic ware from a plastic body by differential rotation of a profile tool and mold, the mold having the contour of one surface of.the ware and the profile tool that of the other surface. (ASTM C 242).
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| Jitterbug |
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A grate tamper for pushing coarse aggregate slightly below the surface of a slab to facilitate finishing.
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| Joint filler |
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Compressible material used to fill a joint to prevent the infiltration of debris and to provide support for sealants.
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| Joint sealant |
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Compressible material used to exclude water and solid foreign materials from joints.
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| Joint, control |
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See Expansion joint. Joint, contraction. See Contraction joint. Joint, expansion. See Expansion joint.
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| Jointer (concrete) |
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A metal tool about 6 in. (150 mm) long and from 2 to 41/2 in. (50'to 100 mm) wide and having shallow, medium, or deep bits (cutting edges) ranging from 3/is in. to 3/a in. (5 to 20 mm) or deeper used to cut a joint partly through fresh concrete.
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| Journeyman |
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An experienced reliable worker who has learned his trade and works for another person.
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