dummy joint

dummy joint

[¦dəm·ē ‚jȯint]
(engineering)
A groove cut into the top half of a concrete slab, sometimes packed with filler, to form a line where the slab can crack with only minimum damage.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

groove joint

A construction joint formed by a groove in a floor slab, wall, or pavement; used to control random cracking.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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