#41  
Old 06-10-2011, 12:52 PM
Mike D's Avatar
Journeyman
 
Join Date: Oct 2010
Location: Berkeley, Ca.
Posts: 342
Default Re: Polished concrete tables.

-GianniFocaccia- I have seen that stuff, but what I have read is the sakcrete has a better aggregate. So that is what I'm going with (as well as I have all the stuff already).

Tscarborough- Thanks that is what I wanted, some sort of barometer to make a couple of test pieces. If I make mix one bag with .25# (1/4#)of Iron Oxide and another with .125# (1/8th#), should that give me an idea what the range of gray would be like?

Thanks for the help guys
Mike
Reply With Quote
  #42  
Old 06-10-2011, 01:12 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 2,861
Default Re: Polished concrete tables.

That will give you a range. The general rule is no more than 10% color by weight of the cement in the mix, so to break that into 80# bags, it is 6x94#=564 of cement per yard/42=13.42# of cement per sack, so no more than 1.34# of color per sack, so your real range is 0-1.34# per sack.

Last edited by Tscarborough; 06-10-2011 at 01:14 PM.
Reply With Quote
  #43  
Old 06-10-2011, 01:20 PM
Mike D's Avatar
Journeyman
 
Join Date: Oct 2010
Location: Berkeley, Ca.
Posts: 342
Default Re: Polished concrete tables.

So maybe more like do one with .25# and another with .75#. I don't think I want it really dark. How does that sound?

Mike
Reply With Quote
  #44  
Old 06-22-2011, 11:23 PM
Mike D's Avatar
Journeyman
 
Join Date: Oct 2010
Location: Berkeley, Ca.
Posts: 342
Default Re: Polished concrete tables.

I did a test piece, came out ok. I think I will use a vibrator when I do the pour around the oven. Does any one have a good slurry mix? I am trying to test this process out as far as it will go.

Mike
Reply With Quote
  #45  
Old 06-23-2011, 04:51 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 2,861
Default Re: Polished concrete tables.

An orbital sander makes a good form vibrator. By slurry are talking about a slurry to coat the forms?
Reply With Quote
  #46  
Old 06-23-2011, 07:50 AM
Mike D's Avatar
Journeyman
 
Join Date: Oct 2010
Location: Berkeley, Ca.
Posts: 342
Default Re: Polished concrete tables.

Sorry, I am talking about a slurry to fill the small holes that come out from sanding.
I found out that the local tool lending library has a concrete vibrator.

Mike
Reply With Quote
  #47  
Old 06-23-2011, 08:20 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 2,861
Default Re: Polished concrete tables.

I am going to slurry mine this weekend, I will be using straight masonry cement with color added.

The vibrator they have is probably an in-concrete vibrator and it is not what you should use. It will cause too much segregation of the aggregate in that shallow of a pour.
Reply With Quote
  #48  
Old 06-23-2011, 09:21 AM
Nic The Landscaper's Avatar
Apprentice
 
Join Date: Jul 2010
Location: Newberg, Oregon
Posts: 100
Default Re: Polished concrete tables.

there is a huge range of things you can do with slurry to get it to do what you want. But a very basic, proven slurry mix is as follows.

Straight Portland cement (grey), sifted with a flour sifter (this is important lumps in the Portland make for a very poor finish). about 2 cups
Acrylic Modifier (I like a product called Tammsweld) about 1 cup or until mix is paste consistency
Add water until the mix is the consistency of ketchup. (Some say yogurt but i think that is a little too thick still, ketchup flows better)

Add color to the mix until the color of the mix matches the color of your pour when wet.

Use an electric or cordless drill with a paint mixer or small taping mud mixer on high speed in a 1 or 2 quart mixing container to mix material. Mix until all lumps are out. Water will act as an activator in this mix and so it will start curing as soon as the water is added, you will have about 20 minutes until slurry is no good.

Optional Items you can add to mix.

Metakaolin: about 20% by volume of portland cement.
MicroSpheres: Microscopic ceramic beads that will help mix flow (Over rated IMO)

DO Not add sand or any aggregate, or use a grout type material. The sand will make it impossible to get a good fill on the holes.

It will generally take 2 to 4 passes with slurry coats to completely fill in all the voids.

Spritz your slab with clean water out of a spray bottle and then scrape slurry mix across the entire surface with a putty knife. the idea is to just push it into the holes and not build up the mix across the entire surface.
Reply With Quote
  #49  
Old 06-23-2011, 09:23 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 2,861
Default Re: Polished concrete tables.

I am not using a bonding agent as I am acid staining it, but other than that I agree 100%
Reply With Quote
  #50  
Old 06-23-2011, 04:25 PM
Mike D's Avatar
Journeyman
 
Join Date: Oct 2010
Location: Berkeley, Ca.
Posts: 342
Default Re: Polished concrete tables.

Tscarborough- why do you say not to use a vibrator. When I watch all the videos (cheng, rhodes) they use a vibrator (in concrete, a vibrating stick you move around in the mix). My counters will be 2 1/2 inches thick.

Thanks for the slurry mix Nic.

Mike
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
A tad concerned about my foundation kebwi Tools, Tips and Techniques 14 10-06-2009 03:08 AM
Alternatives to concrete hearth kebwi Pompeii Oven Construction 9 09-02-2009 08:58 PM
Concrete for the hearth slab. I burnt my fingers Getting Started 6 08-23-2009 08:46 AM
Concrete mixer basics dmun Getting Started 11 06-05-2009 05:48 PM
Curing Concrete and Masonry Xabia Jim Tools, Tips and Techniques 21 03-31-2008 02:15 PM


All times are GMT -7. The time now is 01:04 AM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
© 2006/10 Forno Bravo, LLC