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Old 05-07-2012, 08:09 PM   #1
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Basic Concrete Block Repair


Hi,

I need to repair the joints in a masonry concrete block wall and wondering what is the best material to use for the strongest repair. The advice I've had so far goes something like this:

1. Remove old mortar with chisel
2. Apply concrete adhesive to the joints since it is old concrete
3. Use some of the regular concrete repair mixture from Home Depot ( ie, not necessary to us mortar ). Mix it up using the concrete adhesive to make it really strong.
4. Force into the joints with trowel.

Thanks for advice

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Old 05-07-2012, 08:13 PM   #2
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Basic Concrete Block Repair


Did someone at the box store tell you this info?

Need to post a picture for some better advice.

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Old 05-07-2012, 09:44 PM   #3
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Basic Concrete Block Repair


I'd simply chisel out the old mortar until you get to clean material, and replace with new mortar. Unless you plan to replace all the mortar on every wall, the wall's only going to be as strong as the weakest mortar. And, using repair material that's stronger than the concrete block tends to compromise the integrity of the block through time.
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Old 05-08-2012, 08:08 AM   #4
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Basic Concrete Block Repair


Use the original Type S mortar that was used for this block wall. Chisel clean. If the block is seen, the take care not to smear mortar all over the wall. You could even use a grout bag to fill the joints back it. Good luck.
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Old 05-08-2012, 02:33 PM   #5
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Basic Concrete Block Repair


Thanks for the replies. One more question.

I've also heard that it is a good idea to wet the block first to keep the blocks from sucking the moisture from the mortar. And it's even a good idea to keep the mortar damp by misting periodically.

Is this necessary ?
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Old 05-08-2012, 02:45 PM   #6
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Basic Concrete Block Repair


Not necessary, but good practice dictates that.
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Old 05-08-2012, 03:38 PM   #7
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Basic Concrete Block Repair


And what motar falls to the ground leave it there until it has dried or you'll have a real mess.
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Old 05-12-2012, 05:11 PM   #8
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Basic Concrete Block Repair


Also, is there a way to fix cracks in concrete blocks ?

Epoxy ? If so, is it available in small quantities for the DIY guy ?

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