When we do concrete polishing my time allotment is 2 minute per 10 sf on metals and on 50 resins, and 1 minute per 10 sf after that. That being said, The first cut is the hardest and it gets easier as you go up. I don't think it really takes 1 minute per 10 sf after about 200 grit and higher. But changing out diamonds, dealing with slurry or dust etc is time consuming. My technique for concrete is different than for marble. I use a 17" Klindex with a planetary. On the metals (50, 100) and first cut (50) resin I go forward and backward the whole length of the floor twice. I go forward and backward once on the higher resins. I alter the direction for every stage. This is for new concrete. I have worked on 100 year old concrete where I have spent excessive amounts of time on the first few cuts. I don't think you would need to go over 200 resin for this job. 
Baird 
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Sent from Mailbox


On Tue, Jun 3, 2014 at 1:00 PM, John Freitag <jfreitag@thestoneandtileschool.com> wrote:

Barry,

 

Depends upon the money you want to invest. There are concrete grinding machine that would do this project quick. How many square feet will the total project be?

There are machine you can rent to do this project but first need to determine the square footage and then figure out the production time and costs. You are approaching the project with a metal diamond. What condition or how smooth is the contractor going to leave the concrete? If the contractor leaves the surface in a power troweled finish the time needed with the 50 grit would be less than if they leave the finish rough. If the finish is going to be the same as the sample area then you need to proceed with 50 metal then 100 metal, depending upon the desire the surface can be left at the 100 grit metal but I would recommend a finish at least 50 resin.

I can probably give you some contacts for equipment should decide to rent large equipment to do this job.

 

 

John E Freitag

Director

The Stone & Tile School

Office 407-567-7652

Cell 407-615-0134

jfreitag@thestoneandtileschool.com

 

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www.thestoneandtileschool.com

 

 

 

From: list-manager@stoneandtilepros.simplelists.com [mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Barry Raduta
Sent: Tuesday, June 03, 2014 12:07 PM
To: Restoration and Maintenance
Subject: Grinding "tabby" concrete

 

Hi Partners,

I am trying to work with a hardscapes company that is bidding on an outside patio project where they would pour a large,concrete slab and imbed sea shells into it.  Their plan is to make the surface as smooth as possible.  They would hire me to grind the surface to make it even smoother and expose more of the shells for a really neat look.  they want it smooth but not too smooth because there is a swimming pool involved (slipping danger). 

My goal is to try and get a pricing guesstimate for their bid.  If anyone has any ideas or thoughts on this project, please respond.  I worked on a prepoured 4' x 4' tabby slab that was very rough with my trusty old floor machine with 50 and 100 metals and  it worked well, but I was not able to get the timing down because the area I did was too small.

Thanks in advance,

Barry


--

Thank You,
Barry V Raduta
Diamond Stone & Tile Care-South

Stone & Tile Pros

843-540-1445

 
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