Bonding agent & wicking (new concrete on old concrete) ??

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Rob-in-Toronto
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Bonding agent & wicking (new concrete on old concrete) ??

Post by Rob-in-Toronto » Sun Mar 11, 2018 5:04 pm

Hi there,

I've discovered another hole in my basement concrete floor, but it's in a slab that was placed atop an earlier slab.

I purchased a concrete bonding agent to paint on the the old concrete (and I'll be using the leftover concrete from my last basement floor project).

I'm concerned about water wicking out of the new concrete. Usually, you wet the surface you're pouring on, but a painted on bonding agent would get in the way. Do I need to worry about wicking in a concrete-on-concrete situation? Maybe I spray water atop the drying bonding agent? The bottle doesn't say anything about adding water, so maybe I'm worried about nothing.

Anyway, any info/tips would be greatly appreciated. Thanks!
- Rob


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Shannon
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Re: Question re: bonding agent & wicking (new concrete on old concrete)

Post by Shannon » Sun Mar 11, 2018 6:27 pm

Follow the directions on the bottle. You should not need any extra water on the old surface.
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A. Spruce
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Re: Bonding agent & wicking (new concrete on old concrete) ??

Post by A. Spruce » Sun Mar 11, 2018 10:24 pm

Agreed, always follow product labeling/manufacturer's recommendations.
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Clarence
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Re: Bonding agent & wicking (new concrete on old concrete) ??

Post by Clarence » Mon Mar 12, 2018 7:01 am

By all means follow the product label and look for the following.
This product is Re-emulsifiable , if it states than rewetting will cause it to get tacky.
Most will state do not use on a horizontal surface. Moisture will cause most bonding agents to cause delamination.

Rob-in-Toronto
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Re: Bonding agent & wicking (new concrete on old concrete) ??

Post by Rob-in-Toronto » Mon Mar 12, 2018 4:17 pm

Great advice, as always. Thank you for it!
- Rob

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