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Re: Tile trip-up on SOG

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Brian,

    That 'tile' problem you mentioned may be due to the difference in
thermal properties between the tiles layer and the concrete slab. The
temperature variations during days and nights caused relative movement on
the interface which eventually buckles the interface 'glue' at its weakest
point, ie the construction joint.

    In Jakarta, this sort of things happen with ceramic tiles. We overcome
this problem by placing the tiles about 3 to 5mm from each other and filling
the gap with suitable material which has some degree of 'elasticity', to
allow (ie distribute) the relative movement to take place between tiles and
therefore avoiding accummulation of deformation over a wide area.

    Zacheus.


-----Original Message-----
From: BVeit(--nospam--at)aol.com <BVeit(--nospam--at)aol.com>
To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org>
Date: Friday, 19 June, 1998 11:53 PM
Subject: Tile trip-up on SOG


>I recently inspected a VCT (vinyl comp. tile) that was newly applied to an
>existing Slab On Grade.
>
>40,000 square feet, tilt-up, commercial box.  Everything was fine, except
for
>the following:
>
>Along one line, the entire length of the building about twenty feet out
from a
>wall and parallel, the tile buckled.  It was right along an expansion joint
in
>the slab below.  The contractor claims that this happened AFTER
installation,
>which is now about a month ago.  The tile sort of "^"-ed up, two tiles only
as
>shown (sort of) on the sketch below:
>_____/\___  ( __ = tile floor newly applied to existing slab)
>
>The height is exaggerated on the sketch above, but in anycase it now
presents
>a tripping hazard and must be repaired.
>
>My first inclination is that this is not due to expansive soils or to
>perimeter settlement.  The soils report is negative on expansive soils, and
>their are no cracks in the existing, fifteen year old tilt-up walls.  In
>addition, there are no floor problems anywhere else in the building, and
the
>grade is constant across the expansion joint, i.e. the slab is the same
elev
>on either side.  I also have not heard of any recent earthquakes there.
>
>My thought is that the expansion joint was not properly prepped, and that
the
>mastic did not adhere to the grout/caulk/dirt/whatever that was in the
joint.
>
>But I would appreciate hearing the collective acumen of the Hive before I
>proceed, thanks,
>
>Brian Veit, P.E.
>
>