Sonotube looks like an over grown paper towel tube and comes in various
lengths and diameters. It is used as a concrete form.
If you have ever seen a round bridge pillar with a spiral marking on it,
theres a good chance that the form was sonotube. When the concrete is
cured you tear the sonotube off of the concrete.
ARS N5ZC (ex KA2DSY, N2BHP, WB5M)
Remote Control Airplanes: AMA# 657062
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