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Thread: Cleaning concrete
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22nd August 2009, 05:32 PM #1
Cleaning concrete
I've got some rust and tannin stains in the concrete apron in front of my garage and was wondering if hydrochloric acid is the right product to do the job.
Attachment 114296 Attachment 114297To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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22nd August 2009, 05:40 PM #2
Someone at Bunnings should know!
anne-maria.
Tea Lady
(White with none)
Follow my little workshop/gallery on facebook. things of clay and wood.
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22nd August 2009, 08:53 PM #3
Should work give it a go.
Davidgiveitagoturning @hotmail.com
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22nd August 2009, 09:00 PM #4
When I'm using Hydrocloric acid to clean concrete, I dilute it 5:1 with water.
Maybe do the spots first, to try and remove the worst of it, then do the whole area to get an even look.
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22nd August 2009, 09:11 PM #5
I have successfully removed rust stains from concrete using Oxalic Acid.
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22nd August 2009, 10:48 PM #6
Hey there,
Wasn't there a post about flattening sharpening stones, someone said that it cleaned their concrete, get a few mates to come over and give the driveway a bit of a scruffin'
Otherwise the diluted Hydro acid, and yes I'd do the spots first, then make sure that you rinse it really well or you will be getting little white fluffy bits popping up for ages.
HazzaBIt's Hard to Kick Goals, When the Ba^$%##ds Keep moving the Goal Posts.
Check out my Website www.harrybutlerdesigns.com.au
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24th August 2009, 03:09 PM #7
Hey, perhaps this might help. There are a bunch of instructions and documentation re. concrete surface preparation. Perhaps something related to cleaning concrete as well?
Cheers.
http://www.polishedconcretemelbourne...e-preparation/
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25th August 2009, 02:50 PM #8
Thanks everyone for their input. I mixed up a batch of oxalic acid today at the recommended rate (250g/ltr water) and applied it with a stiff brush after using a pressure washer to remove excess grime. It didn't do too bad a job, got rid of the rust stain and most of the tannin stain. I might give it a go with hydrochloric acid in a week or so. One thing I found out is that although my pressure washer works on tank water with gravity feed it is nowhere near as powerful as when used with mains pressure. I may have to invest in a cheap pump if I'm going to use the pressure washer on a regular basis.
Before:
Attachment 114511 Attachment 114512
After:
Attachment 114510 Attachment 114509To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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