Concrete Countertops - General DIY Discussions - Page 2 - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > DIY Repair > General DIY Discussions

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 10-06-2010, 08:22 PM   #16
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


I got my hands on a 4 cubic ft Kobalt mixer.I found it on craigslist for $140. It was only 2 months old. It hold up to 237lbs.

Advertisement

Millertyme is offline   Reply With Quote
Old 10-06-2010, 11:10 PM   #17
Newbie
 
Join Date: Oct 2010
Posts: 7
Rewards Points: 10
Default

concrete countertops


One thing to consider is the moisture content of the sand... if your starting with dry sand, then much of the mix water is being absorbed by the sand, leaving you with a dry mix. To combat this, take the sand prior to mixing and add just enough water to make it 'stick together' when you squeeze it in your hand. Think of the sand that's just right for a sand castle. Not too dry and not too wet. After you get the moisture content of the sand, go about adding your measured component - you should wind up with the desired slump and workability.

On another note, why no gravel in the mix? Weight? You can achieve a much stronger mix with a 1/2" to 3/4" washed aggregate in conjunction with the sand.

Good luck with the continued project!
grantala is offline   Reply With Quote
Old 10-07-2010, 12:11 AM   #18
Member
 
Join Date: Dec 2009
Location: San Francisco
Posts: 445
Rewards Points: 250
Default

concrete countertops


very cool. I wanted to try doing my own counters too. but that will be almost last step of remodeling, so it will be a long time. I will be watching this thread. Keep us informed with the products & mixtures u try.

Last edited by acerunner; 10-07-2010 at 12:16 AM.
acerunner is offline   Reply With Quote
Old 10-07-2010, 10:12 PM   #19
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


thanks for the tip grantala. I checked my sand it it actually didnt look to dry at all. its in a plastic bag so it seems to keep in the moisture. I didnt use gravel because I didnt use any in my samples. The recepie I have didnt call for any. A basic sand mix, with reinforcing fibers.

I grinded my first piece today which seemed to go well. It looked great when it was wet, but when it dried it seem too light. I also think I should have ground it more. I put it in place on the counter to see how it looked. I liked it , but wifey thought it was too gray. It was supposed to be a tan color. She also agreed ...it need to be grinded more to show more aggregate.
When I did my sample I forgot to measure how much dye I added.I guess I just did it by eye.Well that bit me in the ass when I did my actual counter. I went to make another sample carefully weighing everything and I noticed my dye ratio that I used in my countertop was about 3 times under what I should have used. that is why it looked too gray. So looks like I will be making a new piece.Oh well. Thats why I started with the small one
Millertyme is offline   Reply With Quote
Old 10-11-2010, 09:45 PM   #20
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


i have been having a hard time getting my color perfect. The mix is fine except for my color. What I want is a light tan color. however it keeps coming out slightly gray. it still looks nice but not the color I want. I did a few more samples and they look fine when they are mixed but once i grind them down they look to gray. I am using white portland but when i mix in the sand it makes it slightly gray. i even tried adding some gravel in place of sand. I will see how that one comes out tomorrow.
Millertyme is offline   Reply With Quote
Old 10-11-2010, 11:55 PM   #21
Member
 
Join Date: Jan 2010
Location: Boston, MA
Posts: 275
Rewards Points: 250
Default

concrete countertops


Quote:
Originally Posted by Millertyme View Post
i have been having a hard time getting my color perfect. The mix is fine except for my color. What I want is a light tan color. however it keeps coming out slightly gray. it still looks nice but not the color I want. I did a few more samples and they look fine when they are mixed but once i grind them down they look to gray. I am using white portland but when i mix in the sand it makes it slightly gray. i even tried adding some gravel in place of sand. I will see how that one comes out tomorrow.
After you grind them are you washing the samples? Are you sure the dust isnt making them look grey?
wnabcptrNH is offline   Reply With Quote
Old 10-12-2010, 09:04 PM   #22
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


it does look better when it is wet.but still not the desired color. Im using solomon mortar color. It seems I either add to much or not enough. I think the dye is too dark and i want a light color. If i only add a little bit though it comes out fine...at least before it dries. I add more on the next sample and its too brown. Maybe ill try a lighter dye.
Millertyme is offline   Reply With Quote
Old 10-17-2010, 12:35 PM   #23
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


well i finally got my color right and poured on saturday. I only did half of what i had to do. I did encounter a few problems though. For some reason my mix was hardening too fast once i got it in the form i could barely spread it around, I had maybe 10 min to get it into the form after it came out of the mixer. This was a problem seeing i had to do 3 batches. Once the form was filled, i wanted to screed the top of it but it was difficult because it was already getting hard. the rocks in the sand seemed to rise to the top a bit and it was like scraping cured concrete. The weird part was that there was still a lot of water on the top and it was pouring over the sides. it seemed like the water rose to the top as the mix below was getting hard. i only used 12.5lbs of water for 130lbs of portland and sand which is just over 10% water. the mix did flow nice as soon as it came out of mixer but the water seemed to seperate from the mix pretty fast. Did I use too much superplasticizer?I used 90ml for 130lbs. which the mix called for 50-140.
Millertyme is offline   Reply With Quote
Old 10-17-2010, 09:16 PM   #24
Member
 
Join Date: Mar 2010
Location: Lancaster, PA
Posts: 36
Rewards Points: 25
Default

concrete countertops


Maybe you've already done this but talk to someone who does concrete for a living and they could probably analyze some of the symptoms you are encountering.
speedtree is offline   Reply With Quote
Old 10-24-2010, 02:45 PM   #25
Member
 
Join Date: May 2006
Posts: 252
Rewards Points: 250
Default

concrete countertops


any pics of your 1st section?
What have I done is offline   Reply With Quote
Old 10-25-2010, 09:16 PM   #26
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


the 1st picture was my 1st attempt. The mix wasnt right. I used too much plasticizer. way too much. it caused seperation in my mix.you can see in 3rd pic the stain that was left from water getting trapped under the hardening mix. I tried grinding it out but it didnt work. I remade the mold and made another piece today. i cut my plasticizer in half and used less water. the mix looked a little dry at first but it came out perfect.unlike last time, water wasnt pouring out of my mold.I was even able to trowel it smooth. The first time I couldn't do this because it hardened so damn fast. The last pic is the freshly poured mix.
Attached Images
       
Millertyme is offline   Reply With Quote
The Following User Says Thank You to Millertyme For This Useful Post:
redheads55 (11-04-2010)
Old 11-04-2010, 07:20 PM   #27
Prince George, BC
 
Join Date: Nov 2009
Posts: 53
Rewards Points: 75
Default

concrete countertops


Subscribed! Keep the detailed posts coming, Millertyme... I'll be working on my own counter tops sometime this winter, and the more armed with info, the better!
MisterPG is offline   Reply With Quote
Old 01-15-2011, 02:28 PM   #28
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


Well finally here are the pictures of my countertop done ,sealed and in place...i am satisfied
Attached Images
     
Millertyme is offline   Reply With Quote
Old 01-15-2011, 04:57 PM   #29
Member
 
Join Date: Oct 2010
Location: St.Louis,Mo.
Posts: 212
Rewards Points: 150
Default

concrete countertops


Great job it looks fantastic I love concrete counters now it's time for Q&A. My first question is: What resources did you use for info for this project and did you buy any books or videos?
second ?: What psi is the mix if you know? I'm sure I'll come up with more ?s later cause I am hooked on these counters and would love to try them one day. I have seen 3 methods 1) sack or truck mix poured in place, nice and rustic looking. 2) poured like you did through and through all the same mix and ground or polished, looks like granite or terazzo. 3) is the one mike rowe did on dirty jobs it was sprayed with texture sprayers like for popcorn ceiling. They sprayed several colors to a fairly thin layer then fill the rest with a special counter top strenth mix I would guess the core mix would be cheaper, this method looks like the nicest marble I have ever seen and it makes me drool. Anyway they look sweet you should be proud I am looking forward to learning more.
STL B. is offline   Reply With Quote
Old 01-17-2011, 04:52 PM   #30
Stairguy
 
Join Date: Apr 2010
Location: New Bedford, MA
Posts: 622
Rewards Points: 500
Default

concrete countertops


Quote:
Originally Posted by STL B. View Post
Great job it looks fantastic I love concrete counters now it's time for Q&A. My first question is: What resources did you use for info for this project and did you buy any books or videos?
second ?: What psi is the mix if you know? I'm sure I'll come up with more ?s later cause I am hooked on these counters and would love to try them one day. I have seen 3 methods 1) sack or truck mix poured in place, nice and rustic looking. 2) poured like you did through and through all the same mix and ground or polished, looks like granite or terazzo. 3) is the one mike rowe did on dirty jobs it was sprayed with texture sprayers like for popcorn ceiling. They sprayed several colors to a fairly thin layer then fill the rest with a special counter top strenth mix I would guess the core mix would be cheaper, this method looks like the nicest marble I have ever seen and it makes me drool. Anyway they look sweet you should be proud I am looking forward to learning more.
I found the web to be the bulk of my research. I bought Cheng's book and video and pulled some info out of there as well.The guys in the Concrete Counter Forum were very usefull as well. Those guys really know there stuff. They are the reason I went away from the premixed stuff. By making it yourself you have better control of ingredients and it keeps cost down. I bought most of my stuff from Fishstone which is an online vendor.I do not know the actual psi of my mix but i am sure it is way beyond 5000.

The stuff you saw on tv might have been GFRC (glass fiber reinforced concrete) it is very strong and very lightweight. looks like a fun thing to try, but I would need a few more tools for that.

One more note. If anyone is pushed away by the fact that they think concrete counters are too heavy...dont be. I well overestimated this part. They were heavy but no heavier than granite. My 3'x7' island was carried in the house by just me and a friend.

Advertisement

Millertyme is offline   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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How To Keep Your Concrete Mixer Driver Happy Mort How To Guides 38 02-12-2014 07:25 PM
DIY concrete countertops Millertyme General DIY Discussions 3 05-14-2010 09:01 PM
Concrete Countertops hotBlinds Interior Decorating 2 02-13-2010 02:42 AM
More on concrete countertops. cjsdad Kitchen & Bath Remodeling 11 01-26-2010 10:58 AM
Help!: 4" concrete over 2' dirt over 7/8 wood planking! agent99 Flooring 4 04-28-2009 09:21 AM




Top of Page | View New Posts