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Re: cast-in-place side walks/walk way/foot walk------ treatment of joints

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Structurally speaking, at expansion joint, you need sealant at the joint to prevent any non-compressible material to go in between the slab which might prevent the slab to expand. You don't need this at the (crack) control joint.  The slab are joined at the joint anyway.  You need sealant at the control joint only for aesthetic reason.


A. S. Quilala, P.E.



In a message dated 9/11/02 7:41:36 PM Pacific Daylight Time, sscholl2(--nospam--at)juno.com writes:


One reason to seal the joints in an area where sand blows (such as at our
beach areas) is that at night when the concrete contracts the sand gets
in the joints. Then the next day when expansion occurs you can have
problems because there is no where for expansion to occur. In an extreme
case you can get joint heave with an accompanying explosion.

Stan Scholl, P.E.
Laguna Beach, CA