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12 mm bond breaking neoprene sheet

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struct4me

struct4me

Civil/Environmental
Joined
Feb 4, 2013
Messages
32
Location
IN
Dear All..

why this bond breaking material is used around steel pipe and embedded backfill concrete.

Thanks!!
 
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Presumably, it's added to allow the pipe to move independently of the concrete. Whether that's longitudinal movement or transverse, depends on the conditions. If it's 12mm thick, I would suspect it's to allow the concrete to move transversely relative to whatever is adjacent to it that the pipe goes into, without shearing the pipe or spalling the concrete.
 
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Because of the difference in the coefficient of expansion between the two materials.
 
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