Did you have someone stain your concrete floor and it just turned out horrible? If so you might be interested in knowing how to remove the stain. Depending on what type of stain was used there is two possible ways to remove the stain. If the stain was a water based acrylic stain (paint) you could use a paint stripper to remove the stain from the concrete.
If however the stain was an acid stain or an acetone dye, you will not be able to use any type of strippers to remove or lighten the stain. You will have to grind the concrete with either a hand grinder fitted with a diamond wheel or use a stand behind grinder. Grinding will remove any type of stain that was used, so if your not sure I would begin with grinding the concrete. You want to make sure you don’t use a very aggressive diamond wheel or you will leave a rough profile.
When grinding concrete make sure you have a vacuum and respirator because the concrete dust is very harmful to your lungs. Hope this helps!
How do you repair alkali silica reaction in concrete? I wish there was a simply solution to achieving that. I had a homeowner call and tell me she was having small modules of gel leaching out of the concrete, and over time the gel would harden. She had an engineer come out and take samples of the concrete, they determined that she had alkali silica reaction or (ASR).
So I went over to the house to take a look at the problem and was amazed by what I saw. Take a look for yourself:
Alkali Silica Reaction
I’m sure you can figure out why this might be a problem. For starters she has a decorative overlay in the house that is peeling off because of this reaction. She also has sticky gel all over her floor which makes it difficult to keep clean. She asked if there was any way to prevent the gel from re-appear.
I asked a couple of different suppliers and manufactures about what can be done to stop this. For the most part they all told me the concrete has to be jack hammered out and re-poured, which is not feasible because the house is already built and she is living in it. One person told me I can use a product called Aqua Block and that might help.
I told the homeowner I would not mind messing around with it seeing if anything will help the situation. I suggested to grind the concrete down where the ASR was happening, which happens to be where all of the structural beams are. After grinding the concrete I left one area untreated and another area I treated with Aqua Block to see if that will help at all. After a couple of months I will go back and check to see if their is any improvements. If anyone has any suggestions or questions on this issue please email me at email@example.com.
Acid staining can be a bit tricky when trying to achieve a certain color. When you are not happy with the color of the concrete floor after acid staining, the only practical way to remove an acid stain from concrete is by using a grinder to mechanically remove the top surface of the concrete where the acid stain is. After grinding the acid stain off, we recommend using a dye to re-stain the concrete floor.
In this video clip we are using a stand up grinder with a 24 segment diamond cup wheel to grind off an epoxy coating from a garage floor. Grinding is one of the easiest ways to remove an epoxy from concrete.
If you have an epoxy coating that is flaking off and is needing to be removed, give us a call at (210) 422-6116.
The only way to remove an acid stain is by grinding the stain off the concrete. A lot of times, especially with the darker acid stains, even after grinding the concrete you will see a hint of color still in the concrete. Once you have ground the old acid stain off the concrete you can re-stain the concrete with an acid stain or a dye.
Here we are grinding an acid stain off a concrete patio. After removing the acid stain we will use an acetone dye to color the concrete.
Here is some photos of a recent job we finished; the concrete had black mastic glue that was ground off and then the concrete was sealed and waxed. Grinding is a very cost effective way of removing VCT mastic or carpet mastic from concrete.
Concrete With Mastic Glue
After Grinding The Mastic Off & Sealing The Concrete