Gluing broken concrete

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Old 04-13-17, 09:53 PM
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Gluing broken concrete

Over the years I've accumulated a small collection of busted concrete items: a corner of a stair, some busted sidewalk curb pieces. Nothing big enough to really justify redoing everything. I keep setting the pieces aside thinking that I'll cement or glue them back on but I'm not really sure what product would be best.

Any suggestions? I've used Loctite PL Premium to reset some rocky precast concrete stairs to the stringers and that worked great, but I'm thinking I want something thinner since broken pieces will mate very closely.
 
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Old 04-13-17, 10:14 PM
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PC-11 marine epoxy. Available in most hardware stores. Mix it up, spread it on like peanut butter. Might be thicker than you want, but it has to have enough consistency to contact both surfaces.
 
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Old 04-13-17, 10:45 PM
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Gorrila Glue or a similar polyurethane glue would probably work as well. Wet the surfaces with a sponge as it needs the moisture to cure. Don't use too much. It will foam up as it cures, so you need to hold the pieces in place somehow. It's not like superglue. After it sets, scrape the foam off.
 
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Old 04-15-17, 09:09 AM
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I've used a lot of Gorilla Glue and I'm not sure it has the right properties. After a full cure it's like a very hard foam. I've spilled it on hard surfaces and after it cures you can pop it off. It's great in wood were it can penetrate into the grain.

Menards has an epoxy crack repair made by Akona specifically for masonry. I wonder if that would work well as a glue.
 
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Old 04-15-17, 10:43 AM
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Menards also has RX7 I think it is called, and a mixing nozzle. Its with the anchors, for epoxying bolts in concrete and such. Might be made by Red Head, I forget.
 
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Old 04-15-17, 12:07 PM
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I think this is the stuff that I have used to attach threaded rod to a brick/concrete wall for mounting electrical equipment. Sika 10.1 fl. oz. AnchorFix-2 Anchoring Adhesive-112718 - The Home Depot Sounds similar to what XSleeper was referring to. Sets up CRAZY FAST!!!
 
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Old 04-15-17, 11:04 PM
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There is something called Red Head A7+. That must be it. Geez, expensive.

I've never worked with anchor adhesive. However I would not suspect it has the right properties. If I were designing an adhesive for rebar I'd make something hard and that expands slightly as it cures to really lock something into a hole. Is it very gluey?
 
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Old 04-16-17, 06:52 AM
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The stuff I have used had very good tack with no expansion. The stuff I linked to starts to set in about 30 seconds!!

There is another version that may set slower (says sets in minutes) Sika 10.1 fl. oz. AnchorFix-1 Anchoring Adhesive-112729 - The Home Depot
 
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Old 04-16-17, 06:59 AM
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One of the J-B Weld products may work also
 
 

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