I have seen something like that on my own jobs. In my case
they caused the red chalk line.
From: rivera.gm@gmail.com
[mailto:rivera.gm@gmail.com] On Behalf Of Georgia
Sent: Tuesday, December 29, 2009 5:54 AM
To: Restoration and Maintenance
Subject: RE: [sccpartners] Red Spots on New Installation
It looks like it was polished
after installation. The edge seems to show that it is rounded a
bit. Could this be caused by an acidic polishing substance not being
neutralized?
On Tue, Dec 29, 2009 at 7:49 AM, Dr Fred <fhueston@stoneandtilepros.com>
wrote:
Roger
I have seen this before and it
is possible it is iron or some other mineral. One way to find out is to use a
product from Alpha called RSR2000. This works great as a reagent. place a small
amount on the stone and if it turns purple you have iron. Getting rid of it is
another problem. A grout release may help but you may have a problem with the
grout adhereing to the stone. One solution is to use an epoxy grout or you can
try a grout with pure latex additive with no water.
On Mon, Dec 28, 2009 at 8:37 PM, Roger Konarski <qm144@yahoo.com> wrote:
|
All, Would appreciate input on what’s causing this
problem. Please see attached picture. This floor were just installed and
grouted. The problem is the red stains on the edge of the tiles. What is
causing the problem? My thoughts are that the moisture from the grout is oxidizing
minerals in the stone. If that is the case, would applying a sealer before
grout stop this from happening? They have already laid 600 sq.ft. of the
tile, any suggestions on removing the red spots? I my thoughts is to
try to see if it is iron that is oxidizing and taking the appropriate steps.
Or trying poultice with a hydrogen peroxide. Thanks in advance for your help. Roger Konarski |
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Frederick M. Hueston PhD
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