James,
I cannot recall if we had our terrazzo in the training center when you were in class. However if the terrazzo floors were poured prior to the early 1990 it going to be Portland based cement. We really did not see the epoxy based terrazzo until the 1990.
Regarding the staining , some of these stains appear to be possible rust, the other stains are from the floor being covered and the discoloration is due to the dirt and grime that over the years that have entered the floor.
First I would strip the floor with a strong mixture of a stripper / degreaser.
Second I would grind this floor aggressively using a 50 metal diamond using a neutral cleaner in my water tank for each grind. , this first grind is going to cut into the cement along with cutting deep into the marble chips. By doing this the first cut is doing to expose fresh cement and fresh sto9ne materials. After the first cut then see if the stains are not gone, if not then apply a poultice to the stained areas. The open surface allow the poultice to penetrate deep into the surface and wil allow the stain to be removed easier.
After the first grind then move to 100 grit metal then back to 50 grit resin and proceed up to the level where you want to stop before polishing.
During the grinding process if you see you are pulling out voids within the cement base you can after the 120 or 220 grinds mix up Portland cement using a latex additive and then take a steel cement finish trowel and then go over the entire floor filling in then voids. By using the steel trowel this will force the material into the void leaving very little material on the floor. Allow the floor to dry at least 24 hours and then co9me back and finish your honing and then polish the floor.
Question , please advise
John E. Freitag
President/Director
The Stone and Tile School
Office 407-567-7652
Cell 407-615-0134
jfreitag@thestoneandtileschool.com
From: James Billeaudeau [mailto:james@diamondmarblepolishing.com]
Sent: Tuesday, May 24, 2011 6:54 PM
To: Restoration and Maintenance
Subject: [sccpartners] Re-finishing a Terazzo floor
A potential customer/contractor has 1250 sq ft of terazzo floor in a home he owns and is remodeling. The floor was poured in the early 1970's and it appears to be a portland cement base installation. He would very much like to refinish and keep the terazzo. From the attached photos you should see rust stains, some unknown darker stains, some areas where walls were removed, and some lighter areas especially where a refrigerator once stood and probably leaked. Also in the living room the former owner had a bound carpet rug laid over the terazzo for several years and when removed the floor under the carpet was significantlay lighter in color than the adjacent kitchen & hallway floor. Do you guys think a floor in this shape could resonably be salvaged? I have not given an estimate or done a terazzo restoration job yet, so advice on what to do and how to price is very appreciated.
Thanks to all,
James Billeaudeau
Diamond Marblel Polishing
Lafayette, LA
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