Mating new cement with old

[akpolaris]

I have a pour today.. 840 sq ft floor that is going inside an established footing. I realize that they will not meet seamlessly. Is there a material that I can use to fill the groove that will be left or develop. I believe that there is an epoxy material that I can trowel into the void like grout.. Any ideas or products
Thanks

 

[kd3pc]

sika flex is decent, not epoxy, but it moves and self levels....I would use it.

Epoxy will work, but requires prep work to do what you expect it to do. SOme require building up sand/silica base and then epoxy. Check with one of the epoxy folks here on GJ for details and what you can expect.

Either way, after cutting control joints, I would let the new floor settle a few weeks, before doing either.

 

[LegacyIndustrial]

Our gel crack filler is great for jobs like these.
Flexible but still hard.

http://www.legacyindustrial.net/products/crack-joint-products/legacys-gel-crack-filler.html

 

[Zeke]

I would have doweled into the existing footing and extended the rebar dowels into the new work. You seem to anticipate shrinkage. I don't see why. If there is a hairline crack at the cold joint you can caulk that with any number of products. That Legacy stuff looks terrific but at a not so terrific price for a perimeter. Not knocking the product in the least, it's just that there are a lot polyurethane caulks that would do the job for about $5-6 a tube.

 

[akpolaris]

Zeke I am well secured into the footing with rebar. I do not have a clean a joint between the 2 pours as I would like. I am just exploring some options. Cement is a living being, it will do as it wants. I am just looking to see what the different products out are. I live in a small town at the end of the road so this is a great place to see what else is out there