![Thanks](https://www.renovateforums.com.au/dbtech/thanks/images/thanks.png)
![Likes](https://www.renovateforums.com.au/dbtech/thanks/images/likes.png)
![Needs Pictures](https://www.woodworkforums.com/images/smilies/happy/photo4.gif)
![Picture(s) thanks](https://www.ubeaut.biz/wave.gif)
Results 1 to 6 of 6
-
1st August 2005, 11:57 AM #1
white powdery stain on concrete pavers
I have some concrete pavers that have a white powdery stain around or towards the edges.
The concrete pavers are coloured and about 500mm square and 50mm deep.
Some areas of the paving are worse than others but as much as 70% of the pavers are effected.
It was laid about 6 months ago, with a plastic membrane then paving sand on top.
The white powdery stain can be removed very easily by rubbing with the foot but.
If the stain is not removed it etches the colour oxide from the pavers.
Is it a salt stain?
Is it from the paving sand and or concrete pavers?
I would normally use crusher dust [dolomite] but was strongly advise to use the paving sand.
Any suggestions to rectify the problem.
Many thanks
Pulpo
-
1st August 2005, 12:19 PM #2
It will be salts from the concrete pavers. Sand is inert and insoluble and there's not likely to be much else mixed in with it. Since you have a plastic membrane down too, that really only leaves the pavers themselves. Its called efflorescence and will continue until the pavers are weathered and the salts are leached away(which might be a long time given that you have an impermeable membrane below the pavers) You can buy cleaners for it or use HCl, but they are likely to add to the salt problems in themselves. After you clean them you can use a penetrating sealer on them that will stop further staining. Have a look at this:
http://www.factsfacts.com/MyHomeRepa...lorescence.htm
Cheers
Michael
-
1st August 2005, 04:24 PM #3
Originally Posted by mic-d
Dammit. I was going to be so helpful on this thread, but I couldn't think of anything else to add. Not a thing. Nada. Zilch.
Good response mic-d.
TravSome days we are the flies; some days we are the windscreen
-
1st August 2005, 10:02 PM #4
Pardon my ignorance but why would you put a plastic membrane under pavers:confused:
Plausible deniability is the key to success
-
2nd August 2005, 08:51 AM #5
I suppose its a way of suppressing weeds, but they'll still seed in cracks/joints unless you've used cement gap filler/grout...
Cheers
Michael
-
3rd August 2005, 11:48 PM #6
Thanks for reply.
Heres hoping the mositure from the concrete pavers dissipates soon.
The placing of the plastic membrane is a long story.
It certainly stops the weeds but not neccessary as the crack between the pavers has cement sand for filling.
The weeds dont seem to come up from the bottom anyway rather they grow in the cracks between pavers.
I have done a bit of paving and never used the plastic before and unlikely to use it again.
Cheers
Pulpo
Similar Threads
-
White polish
By Corunetes in forum FINISHINGReplies: 5Last Post: 28th July 2005, 11:55 AM -
Stain Types
By Gazza in forum FINISHINGReplies: 2Last Post: 14th July 2005, 12:39 AM -
Sealing Concrete Pavers
By Strungout in forum CONCRETINGReplies: 3Last Post: 2nd July 2005, 09:33 AM -
Liming white on Australia ash
By JupiterCreek in forum FINISHINGReplies: 2Last Post: 19th September 2004, 12:54 AM -
Concrete over concrete
By Sir Stinkalot in forum CONCRETINGReplies: 4Last Post: 18th July 2003, 10:59 PM